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nowadays the family of iron pnictides is a well - established and important prototype system for unconventional high - temperature superconductivity . starting with the first famous compound @xcite in 2008 , today several different sub - families with a wide structural variety
are known .
all different groups of ir... | by means of one - step model calculations the strong in - plane anisotropy seen in angle - resolved photoemission of the well - known iron pnictide prototype compounds and in their low - temperature antiferromagnetic phases is investigated .
the fully - relativistic calculations are based on the korringa - kohn - ros... | arxiv |
the m31 globular cluster ( gc ) b158 ( a.k.a . bo 158 ) , named following the revised bologna catalogue v3.4 @xcite , contains a bright x - ray source that was discovered by the einstein observatory @xcite , and has shown up in every x - ray observation of the region since ; we call this x - ray source xb158 .
xb158 ... | the m31 globular cluster x - ray binary xb158 ( a.k.a . bo 158 ) exhibits intensity dips on a 2.78 hr period in some observations , but not others .
the short period suggests a low mass ratio , and an asymmetric , precessing disk due to additional tidal torques from the donor star since the disk crosses the 3:1 reson... | arxiv |
the methods used to calculate the energy and the lifetime of a resonance state are numerous @xcite and , in some cases , has been put forward over strong foundations @xcite .
however , the analysis of the numerical results of a particular method when applied to a given problem is far from direct . the complex scalin... | the resonance states of one- and two - particle hamiltonians are studied using variational expansions with real basis - set functions .
the resonance energies , @xmath0 , and widths , @xmath1 , are calculated using the density of states and an @xmath2 golden rule - like formula .
we present a recipe to select adequ... | arxiv |
the theme of @xmath0 ( parity time ) symmetric systems was initiated in the works of bender and collaborators @xcite as an alternative to the standard quantum theory , where the hamiltonian is postulated to be hermitian .
the principal conclusion of these works was that @xmath0-invariant hamiltonians , which are no... | we introduce four basic two - dimensional ( 2d ) plaquette configurations with onsite cubic nonlinearities , which may be used as building blocks for 2d @xmath0-symmetric lattices . for each configuration
, we develop a dynamical model and examine its @xmath1symmetry .
the corresponding nonlinear modes are analyzed... | arxiv |
the cataclysmic variable hu aqr currently consists of a 0.80 white dwarf that accretes from a 0.18 main - sequence companion star .
the transfer of mass in the tight @xmath12 orbit is mediate by the emission of gravitational waves and the strong magnetic field of the accreting star . since its discovery
, irregular... | cataclysmic variables ( cvs ) are binaries in which a compact white dwarf accretes material from a low - mass companion star .
the discovery of two planets in orbit around the cv hu aquarii opens unusual opportunities for understanding the formation and evolution of this system .
in particular the orbital parameter... | arxiv |
the @xmath0 ncsm / rgm was presented in @xcite as a promising technique that is able to treat both structure and reactions in light nuclear systems .
this approach combines a microscopic cluster technique with the use of realistic interactions and a consistent @xmath0 description of the nucleon clusters .
the metho... | we introduce an extension of the @xmath0 no - core shell model / resonating group method ( ncsm / rgm ) in order to describe three - body cluster states .
we present results for the @xmath1he ground state within a @xmath2he+n+n cluster basis as well as first results for the phase shifts of different channels of the @... | arxiv |
the experimental evidence of the theoretically predicted skyrmions in non - centrosymmetric compounds with dzyloshinskii - moriya interaction has intrigued many scientists over the last years.@xcite recently , the preparation of thin films of b20 type mnsi on silicon substrates @xcite has offered promising prospects wi... | mnge has been grown as a thin film on si(111 ) substrates by molecular beam epitaxy .
a 10 layer of mnsi was used as seedlayer in order to establish the b20 crystal structure .
films of a thickness between 45 and 135 have been prepared and structually characterized by rheed , afm and xrd .
these techniques give e... | arxiv |
recall a polynomial @xmath0 is _ postcritically finite _ if the forward orbits of its critical points are finite .
then the filled julia set of @xmath1 contains a forward invariant , finite topological tree , called the _ hubbard tree _ @xcite .
the _ core entropy _ of @xmath1 is the topological entropy of the rest... | the core entropy of polynomials , recently introduced by w. thurston , is a dynamical invariant which can be defined purely in combinatorial terms , and provides a useful tool to study parameter spaces of polynomials .
the theory of core entropy extends to complex polynomials the entropy theory for real unimodal maps... | arxiv |
the detection of x - ray , optical and radio afterglows from some well - localized gamma - ray bursts ( grbs ) definitely shows that at least most long grbs are of cosmological origin ( e.g. , costa et al .
1997 ; frail et al . 1997 ; galama et al . 1998 ; akerlof et al . 1999 ; zhu et al . 1999 ) .
the so called f... | it is believed that orphan afterglow searches can help to measure the beaming angle in gamma - ray bursts ( grbs ) .
great expectations have been put on this method .
we point out that the method is in fact not as simple as we originally expected . due to the baryon - rich environment that is common to almost all p... | arxiv |
cosmic bursts of gamma - rays are some of the most elusive and mysterious events in the universe . typical burst lasts less than a minute and disappears thereafter .
however , since the _ bepposax _ s first discovery on 1997 february 28 ( costa et al . 1997 ) it is known that gamma - ray bursts ( grbs ) also produce ... | we present the _ xmm - newton _ observations of x - ray afterglows of the @xmath0-ray bursts grb 011211 and grb 001025 . for grb 011211
_ xmm _ detected fading x - ray object with an average flux in 0.2 - 10 kev declining from @xmath1 erg @xmath2 s@xmath3 during the first 5 ks of 27-ks observation to @xmath4 ... | arxiv |
the layered organic material 3 ( ai3 ) , which has been studied since the 1980s,@xcite has recently attracted renewed interest because it reveals low - energy massless dirac fermions under hyrdostatic pressure ( @xmath2 gpa).@xcite compared to graphene , certainly the most popular material with low - energy dirac fermi... | transport measurements were performed on the organic layered compound 3 under hydrostatic pressure .
the carrier types , densities and mobilities are determined from the magneto - conductance of 3 .
while evidence of high - mobility massless dirac carriers has already been given , we report here , their coexistence... | arxiv |
fe - based superconductors ( febs ) represent a non - cuprate class of high-@xmath9 systems with the unconventional superconducting state . the origin of the latter is still debated . in general ,
febs can be divided into the two subclasses , pnictides and chalcogenides @xcite , with the square lattice of iron as th... | we study the spin resonance in superconducting state of iron - based materials within multiband models with two unequal gaps , @xmath0 and @xmath1 , on different fermi surface pockets .
we show that due to the indirect nature of the gap entering the spin susceptibility at the nesting wave vector @xmath2 the total gap... | arxiv |
the presence of impurities usually deeply modify the nature of the spectrum of a quantum system , and thus its coherence and transport properties . in the absence of interactions , if the impurity distribution is completely random , all states of the spectrum are exponentially localized in dimensions one ( 1d ) and two... | we introduce a two - dimensional short - range correlated disorder that is the natural generalization of the well - known one - dimensional dual random dimer model [ phys .
rev .
lett * 65 * , 88 ( 1990 ) ] .
we demonstrate that , as in one dimension , this model induces a localization - delocalization transition... | arxiv |
in a graph @xmath14 , an independent set @xmath15 is a subset of the vertices of @xmath0 such that no two vertices in @xmath15 are adjacent .
the independence number @xmath2 is the cardinality of a largest set of independent vertices and an independent set of size @xmath2 is called an @xmath16-set .
the maximum ind... | determining the size of a maximum independent set of a graph @xmath0 , denoted by @xmath1 , is an np - hard problem .
therefore many attempts are made to find upper and lower bounds , or exact values of @xmath2 for special classes of graphs .
this paper is aimed toward studying this problem for the class of general... | arxiv |
quantum key distribution ( qkd ) is often said to be unconditionally secure @xcite .
more precisely , qkd can be proven to be secure against any eavesdropping _ given _ that the users ( alice and bob ) devices satisfy some requirements , which often include mathematical characterization of users devices as well as th... | in this paper , we study the unconditional security of the so - called measurement device independent quantum key distribution ( mdiqkd ) with the basis - dependent flaw in the context of phase encoding schemes .
we propose two schemes for the phase encoding , the first one employs a phase locking technique with the ... | arxiv |
massive stars play a fundamental role in driving the energy flow and material cycles that influence the physical and chemical evolution of galaxies . despite receiving much attention
, their formation process remains enigmatic .
observationally , the large distances to the nearest examples and the clustered mode of... | we present high resolution , mid - infrared images toward three hot molecular cores signposted by methanol maser emission ; g173.49 + 2.42 ( s231 , s233ir ) , g188.95 + 0.89 ( s252 , afgl-5180 ) and g192.60 - 0.05 ( s255ir ) . each of the cores was targeted with michelle on gemini north using 5 filters from 7.9 to 18.5... | arxiv |
modified theories of gravity have attained much attention after the discovery of expanding accelerated universe .
the basic ingredient responsible for this tremendous change in cosmic history is some mysterious type force having repulsive nature dubbed as dark energy .
the enigmatic nature of this energy has motiva... | the aim of this paper is to reconstruct and analyze the stability of some cosmological models against linear perturbations in @xmath0 gravity ( @xmath1 and @xmath2 represent the gauss - bonnet invariant and trace of the energy - momentum tensor , respectively ) .
we formulate the field equations for both general as w... | arxiv |
majorana fermions ( mfs ) are real solutions of the dirac equation and which are their own antiparticles @xmath0 @xcite .
although proposed originally as a model for neutrinos , mfs have recently been predicted to occur as quasi - particle bound states in engineered condensed matter systems @xcite .
this exotic par... | motivated by a recent experiment [ nadj - perge et al . , science 346 ,
602 ( 2014 ) ] providing evidence for majorana zero modes in iron chains on the superconducting pb surface , in the present work , we theoretically propose an all - optical scheme to detect majorana fermions , which is very different from the cur... | arxiv |
first evidence of the violation of time reversal symmetry has been found in the kaon system @xcite . despite strong efforts no other signal of violation of time
reversal symmetry has been found to date .
however , by now , studying time reversal symmetry has become a corner stone of the search for physics beyond t... | tests of time reversal symmetry at low and medium energies may be analyzed in the framework of effective hadronic interactions . here , we consider the quark structure of hadrons to make a connection to the more fundamental degrees of freedom .
it turns out that for @xmath0even @xmath1odd interactions hadronic matrix... | arxiv |
type ia supernovae ( sne ia ) , characterized by no @xmath1 but strong si lines in the spectra at the maximum brightness , are brighter than most of sne classified into the other types and exhibit uniform light curves .
thus they are used as a standard candle to measure distances to remote galaxies .
a plausible ex... | we propose a method to identify the companion stars of type ia supernovae ( sne ia ) in young supernova remnants ( snrs ) by recognizing distinct features of absorption lines due to fe i appearing in the spectrum .
if a sufficient amount of fe i remains in the ejecta , fe i atoms moving toward us absorb photons by tr... | arxiv |
quantum entanglement is a feature of quantum mechanics that has captured much recent interest due to its essential role in quantum information processing @xcite . it may be characterized and manipulated independently of its physical realization , and it obeys a set of conservation laws ;
as such , it is regarded and ... | a system of cascaded qubits interacting via the oneway exchange of photons is studied . while for general operating conditions the system evolves to a superposition of bell states ( a dark state ) in the long - time limit , under a particular _ resonance _ condition no steady state is reached within a finite time .
w... | arxiv |
in the unification scheme of agn the difference between type 1 and type 2 agn is explained by angle - dependent circumnuclear obscuration of the accretion disk and broad - line region @xcite . this obscuring dusty medium
commonly referred to as `` dust torus '' is optically and geometrically thick and probably exten... | we use restframe near- and mid - ir data of an isotropically selected sample of quasars and radio galaxies at @xmath0 , which have been published previously , to study the wavelength - dependent anisotropy of the ir emission . for
that we build average seds of the quasar subsample (= type 1 agn ) and radio galaxies (... | arxiv |
continuous - variable quantum - key distribution ( cvqkd ) , as an unconditionally secure communication scheme between two legitimate parties alice and bob , has achieved advanced improvements in theoretical analysis and experimental implementation in recent years @xcite .
practical implementation systems , such as f... | we consider the security of practical continuous - variable quantum key distribution implementation with the local oscillator ( lo ) fluctuating in time , which opens a loophole for eve to intercept the secret key .
we show that eve can simulate this fluctuation to hide her gaussian collective attack by reducing the ... | arxiv |
the goal of the development of the code was to have a simple and efficient tool for the computation of adiabatic oscillation frequencies and eigenfunctions for general stellar models , emphasizing also the accuracy of the results .
not surprisingly , given the long development period , the simplicity is now less evid... | development of the aarhus adiabatic pulsation code started around 1978 .
although the main features have been stable for more than a decade , development of the code is continuing , concerning numerical properties and output .
the code has been provided as a generally available package and has seen substantial use ... | arxiv |
an important manifestation of the activity inside the disks of gas - rich galaxies is their highly structured hi distribution , marked by cavities , shells and supershells .
first discovered in the milky way ( heiles 1979 , 1984 ) , such features are now known to exist in a number of spiral galaxies ( e.g. lehnert & ... | taking a clue from the pair of hi supershells found in the scd galaxy ngc 3556 ( m 108 ) , we propose a new mechanism for the origin of hi supershells in gas - rich massive galaxies . in this scenario ,
the two supershells were inflated out of the neutral hydrogen disk due to the localised flaring of a pair of radi... | arxiv |
the first color - magnitude diagrams ( cmd ) obtained by baade for the dwarf spheroidal ( dsph ) companions of the milky way , and in particular for the draco system ( baade & swope 1961 ) , showed all of the features present in the cmd s of globular clusters .
this , together with the presence of rr lyrae stars ( ba... | we present deep @xmath0 f555w ( @xmath1 ) and f814w ( @xmath2 ) observations of a central field in the local group dwarf spheroidal ( dsph ) galaxy leo i. the resulting color - magnitude diagram ( cmd ) reaches @xmath3 and reveals the oldest @xmath4 gyr old turnoffs .
nevertheless , a horizontal branch is not obviou... | arxiv |
this article is motivated by the following result of berestycki , et al . given in @xcite for the laplacian perturbed by a divergence - free drift in dimensions @xmath10 .
let @xmath11 be a bounded @xmath12 regular open set and let @xmath13 be a bounded @xmath7-dimensional vector field such that @xmath14 on @xmath2 i... | we study the principal dirichlet eigenvalue of the operator @xmath0 , on a bounded @xmath1 regular domain @xmath2 . here
@xmath3 , @xmath4 is the fractional laplacian , @xmath5 , and @xmath6 is a bounded @xmath7-dimensional divergence - free vector field in the sobolev space @xmath8 .
we prove that the eigenvalue r... | arxiv |
inferring macroscopic properties of physical systems from their microscopic description is an ongoing work in many disciplines of physics , like condensed matter , ultra cold atoms or quantum chromo dynamics .
the most drastic changes in the macroscopic properties of a physical system occur at phase transitions , whi... | we employ unsupervised machine learning techniques to learn latent parameters which best describe states of the two - dimensional ising model and the three - dimensional xy model .
these methods range from principal component analysis to artificial neural network based variational autoencoders .
the states are samp... | arxiv |
main laws of quantum mechanics forbids the perfect cloning of the quantum states , see corresponding discussion for the pure states in @xcite , @xcite , and for the mixed states in @xcite .
but it is possible to carry out an approximate copying of the quantum states @xcite .
quantum cloning machines ( qcm ) depend ... | we discuss the `` partial '' quantum cloning of the pure two - partite states , when the `` part '' of initial state related to the one qubit is copied only .
the same approach gives the possibility to design the quantum copying machine for the mixed qubit states .
* `` partial '' quantum cloning and quantum clonin... | arxiv |
the nature of dark matter remains one of the outstanding questions of modern astrophysics .
the success of the cold dark matter cosmological model ( albeit with `` dark energy '' now required : @xmath3cdm ) argues strongly for a major component of the dark matter being in the form of an elementary particle .
howeve... | gamma - ray spectra from cosmic - ray proton and electron interactions with dense gas clouds have been calculated using a monte carlo event simulation code , geant4 .
such clouds are postulated as a possible form of baryonic dark matter in the universe .
the simulation fully tracks the cascade and transport process... | arxiv |
colloidal suspensions present the possibility to develop novel materials via self - assembly . of particular interest are colloidal crystals , whose optical properties can generate iridescent colours , and provide a means by which photonic crystals may be produced@xcite , while further applications range from lasers @x... | we compare the behaviour of a new 2d aqueous colloidal model system with a simple numerical treatment . to first order
the attractive interaction between the colloids induced by an in - plane rotating ac electric field is dipolar , while the charge stablisation leads to a shorter ranged , yukawa - like repulsion . in... | arxiv |
soft x ray transients ( sxrts ) , when in outburst , show properties similar to those of persistent low mass x ray binaries containing a neutron star ( lmxrbs ; white et al .
1984 ; tanaka & shibazaki 1996 ; campana et al . 1998 ) . the large variations in the accretion rate that are characteristic of sxrts allow t... | we report on the march - april 1997 bepposax observations of aql x-1 , the first to monitor the evolution of the spectral and time variability properties of a neutron star soft x
ray transient from the outburst decay to quiescence .
we observed a fast x ray flux decay , which brought the source luminosity from @xm... | arxiv |
on 9th october 2006 , @xcite reported k. itagaki s discovery of a possible supernova ( sn ) in ugc 4904 .
although the sn was discovered after the peak , an upper limit of the @xmath6 magnitude ( @xmath7 ) was obtained at @xmath820 days before the discovery @xcite .
interestingly , @xcite also reported that an opt... | we present a theoretical model for type ib supernova ( sn ) 2006jc .
we calculate the evolution of the progenitor star , hydrodynamics and nucleosynthesis of the sn explosion , and the sn bolometric light curve ( lc ) .
the synthetic bolometric lc is compared with the observed bolometric lc constructed by integrat... | arxiv |
the micro - quasar grs 1915 + 105 is an enigmatic black hole binary ( bhb ) exhibiting enormous variability which have been classified in more than 14 different variability classes @xcite .
it is believed that the extreme variability and rapid state changes observed in grs 1915 + 105 are due to a very high accretion ... | igr j170913624 is a transient x - ray source and is believed to be a galactic black hole candidate .
recently , it has received a considerable attention due to the detection of peculiar variability patterns known as ` heartbeats ' , which are quasi - periodic mini - outbursts repeated over timescales ranging between ... | arxiv |
the extinction curve describes how the extinction changes with the wavelength .
extinction is due to the presence of dust grains in the interstellar medium and its characteristics are different in a diffuse interstellar medium as compared to a dense interstellar medium .
thus , the knowledge of extinction curve is ... | we present determinations of the total to selective extinction ratio @xmath0 and visual extinction @xmath1 values for milky way stars using ultraviolet color excesses .
we extend the analysis of @xcite by using non - equal weights derived from observational errors .
we present a detailed discussion of various stati... | arxiv |
an @xmath0-hypergeometric system @xmath1 is a @xmath4-module determined by an integral matrix @xmath0 and a complex parameter vector @xmath5 .
these systems are also known as _ gkz - systems _ , as they were introduced in the late 1980 s by gelfand , graev , kapranov , and zelevinsky @xcite .
their solutions occur ... | the holonomic rank of the @xmath0-hypergeometric system @xmath1 is the degree of the toric ideal @xmath2 for generic parameters ; in general , this is only a lower bound . to the semigroup ring of @xmath0
we attach the ranking arrangement and use this algebraic invariant and the exceptional arrangement of nongeneric ... | arxiv |
a quantum computer will allow to perform some algorithms much faster than in classical computers e.g. shor algorithm for the factorization the numbers @xcite .
the basic elements in the quantum computation are qubits and quantum logical gates , which allow to construct any circuit to quantum algorithms .
the good c... | we present a model of a qubit built of a three coherently coupled quantum dots with three spins in a triangular geometry .
the qubit states are encoded in the doublet subspace and they are controlled by a gate voltage , which breaks the triangular symmetry of the system .
we show how to prepare the qubit and to per... | arxiv |
symbiotic systems ( ss ) are generally composed by a white dwarf ( wd ) , a red giant ( rg ) star , and by circumstellar and circumbinary nebulae .
gas and dust radiation from the nebulae appear throughout a large frequency range , from radio to x - rays .
z andromedae ( z and ) binary system consists of a cool gia... | the visual magnitude profile of the symbiotic system z and during the 1984 - 1986 activity period appears double peaked and the flux intensity is low compared to outbursts in other epochs .
the detailed modeling of the observed spectra , accounting for the shells ejected by the red giant star , shows that the outburs... | arxiv |
networks with randomly distributed single walled carbon nanotubes ( swcnts ) are emerging as novel materials for various applications , particularly as electronic materials .
@xcite this creates a need for the accurate determination of their fundamental electrical properties .
swcnt networks can be viewed as a two ... | we present measurements of the frequency and electric field dependent conductivity of single walled carbon nanotube(swcnt ) networks of various densities .
the ac conductivity as a function of frequency is consistent with the extended pair approximation model and increases with frequency above an onset frequency @xma... | arxiv |
the quantum algorithms work much more efficiently than their classicalcounter parts due to quantum superposition and quantum interference .
for example , consider the search of an item in an unsorted database containing @xmath0 elements .
classical computation requires @xmath1 steps to carry out the search .
howe... | we present a scheme for the implementation of three - qubit grover s algorithm using four - level superconducting quantum interference devices ( squids ) coupled to a superconducting resonator .
the scheme is based on resonant , off - resonant interaction of the cavity field with squids and application of classical m... | arxiv |
in the 1970s many - body theory flourished .
a topic that attracted much attention was the many - body effects on xps ( x - ray photoelectron spectroscopy ) spectra , from deep core levels in metals@xcite .
related effects were singularities that appeared near edges in absorption and emission spectra@xcite .
the ... | we calculate core - level spectra for pristine and doped free - standing graphene sheets .
instructions for how to perform the calculations are given in detail .
although pristine graphene is not metallic the core - level spectrum presents low - energy tailing which is characteristic of metallic systems .
the pea... | arxiv |
selection , random genetic drift and mutations are the processes underlying darwinian evolution . for a long time
population geneticists have analyzed the dynamics in the simplest setting consisting of two genotypes evolving under these processes @xcite . in those studies
, a genotype represents an individual s gen... | evolution is simultaneously driven by a number of processes such as mutation , competition and random sampling .
understanding which of these processes is dominating the collective evolutionary dynamics in dependence on system properties is a fundamental aim of theoretical research .
recent works quantitatively stu... | arxiv |
the phase - field method has become the method of choice for simulating microstructure formation during solidification .
it owes its popularity mainly to its algorithmic simplicity : the cumbersome problem of tracking moving solid - liquid interfaces or grain boundaries is avoided by describing the geometry in terms ... | three different topics in phase - field modelling of solidification are discussed , with particular emphasis on the limitations of the currently available modelling approaches .
first , thin - interface limits of two - sided phase - field models are examined , and it is shown that the antitrapping current is in gener... | arxiv |
the fundamental atmospheric ( effective temperature , surface gravity , and metallicity ) and physical ( mass and age ) parameters of stars provide the major observational foundation for chemo - dynamical studies of the milky way and other galaxies in the local group . with the dawn of large spectroscopic surveys to st... | we present a comprehensive analysis of different techniques available for the spectroscopic analysis of fgk stars , and provide a recommended methodology which efficiently estimates accurate stellar atmospheric parameters for large samples of stars .
our analysis includes a simultaneous equivalent width analysis of f... | arxiv |
the effects of weak gravitational lensing by the large - scale structure have been detected in several samples of high redshift qsos , intermediate redshift galaxies , and batse grbs . in the case of point sources , qsos and grbs ,
weak lensing manifests itself as angular ( anti-)correlations between these sources an... | the current sample of high - redshift supernova type ia , which combines results from two teams , high-@xmath0 supernova search team and supernova cosmology project , is analyzed for the effects of weak lensing . after correcting sne magnitudes for cosmological distances , assuming recently published , homogeneous dist... | arxiv |
lanthanide based heavy fermion ( hf ) metals constitute a major , long studied class of correlated electron materials @xcite .
their behaviour is quite distinct from conventional clean metals , the basic physics being driven by strong spin - flip scattering from essentially localised @xmath3-levels , generating the ... | the paramagnetic phase of heavy fermion systems is investigated , using a non - perturbative local moment approach to the asymmetric periodic anderson model within the framework of dynamical mean field theory .
the natural focus is on the strong coupling kondo - lattice regime wherein single - particle spectra , scat... | arxiv |
the kinetics of polymer loop formation has been studied for several decades and recently has attracted renewed attention due to the particular importance in biology .
the dna loop formation is a basic process that underlies genetic expression , replication , and recombination @xcite .
for example , in _ e. coli _ ... | biopolymer looping is a dynamic process that occurs ubiquitously in cells for gene regulation , protein folding , etc . in cellular environments , biopolymers are often subject to tensions which are either static , or temporally fluctuating far away from equilibrium .
we study the dynamics of semiflexible polymer loo... | arxiv |
tidal interactions play an important role in dynamical processes in the two - body problem in close binary systems : star star ( binary star ) or star planet .
they can lead to such phenomena as synchronization and orbital circularization ( hut 1981 ; zahn 1977 ) as well as to the tidal capture ( press and teukolsky... | we investigate the change in the orbital period of a binary system due to dynamical tides by taking into account the evolution of a main - sequence star .
three stars with masses of one , one and a half , and two solar masses are considered .
a star of one solar mass at lifetimes @xmath0 yr closely corresponds to o... | arxiv |
pushing the resolution limits of light microscopy , and understanding optical phenomena on scales below the diffraction limit , has been the driving force of what is known today as nano - optics @xcite . to overcome this limit ,
most of the early work was focused on near - field optical microscopy and related techni... | we study the fluctuations of the light emitted by two identical incoherent point sources in a disordered environment .
the intensity - intensity correlation function and the speckle contrast , obtained after proper temporal and configurational averaging , encode the relative distance between the two sources .
this ... | arxiv |
in many studies of cell mechanics and dynamics , the cell is characterized as a viscoelastic body @xcite .
it is an intriguing question to what extent such mechanical behaviour can be rationalized in terms of comparatively simple polymer physics models . in this respect ,
the comparison of cell rheological data and... | we propose a physical model for the nonlinear inelastic mechanics of sticky biopolymer networks with potential applications to inelastic cell mechanics .
it consists in a minimal extension of the glassy wormlike chain ( ) model , which has recently been highly successful as a quantitative mathematical description of ... | arxiv |
recently , topological properties of time - reversal - invariant band insulators in two and three dimensions have been extensively studied@xcite . a class of insulators preserving the time reversal symmetry is called topological insulators characterized by non - trivial topological invariants@xcite.the topological insu... | realization and design of topological insulators emerging from electron correlations , called topological mott insulators ( tmis ) , is pursued by using mean - field approximations as well as multi - variable variational monte carlo ( mvmc ) methods for dirac electrons on honeycomb lattices .
the topological insulato... | arxiv |
graphene has garnered interest from broad spectrum of communities , ranging from those aiming at atomic scale circuit devices to those searching for new topological phases . both communities sought after ways to gap the massless dirac spectrum .
the realization of a gate - induced band - gap in the bernal stacked bi ... | despite much interest in engineering new topological surface(edge ) states using structural defects , such topological surface states have not been observed yet .
we show that recently imaged tilt boundaries in gated multi - layer graphene should support topologically protected gapless edge states .
we approach the... | arxiv |
macromolecules containing ionizable groups when dissolve in a polar solvent such as water , dissociate into charged macromolecules and counterions ( ions of opposite charge ) . depending on acidic or basic property of their monomers ,
ionizable polymers in solution can be classified into polyelectrolytes and polyamph... | planar brushes of flexible , semiflexible and rodlike diblock polyampholytes are studied using molecular dynamics simulations in a wide range of the grafting density .
simulations show linear dependence of the average thickness on the grafting density in all cases regardless of different flexibility of anchored chain... | arxiv |
the light flavor scalar mesons present a remarkable exception for the naive quark model , and the structures of those mesons have not been unambiguously determined yet .
the numerous candidates with @xmath1 below @xmath2 can not be accommodated in one @xmath3 nonet , some are supposed to be glueballs , molecular stat... | in this article , we take the scalar diquarks as point particles and describe them as basic quantum fields , then introduce the @xmath0 color gauge interaction and new vacuum condensates to study the nonet scalar mesons as tetraquark states with the qcd sum rules . comparing with the conventional quark currents , the d... | arxiv |
ime - domain simulation is an important approach for power system dynamic analysis .
however , the complete system model , or interchangeably the long - term stability model , typically includes different components where each component requires several differential and algebraic equations ( dae ) to represent , at t... | in this paper , pseudo - transient continuation method has been modified and implemented in power system long - term stability analysis .
this method is a middle ground between integration and steady state calculation , thus is a good compromise between accuracy and efficiency .
pseudo - transient continuation meth... | arxiv |
in recent years , the problem of anisotropic quantum scattering in two spatial dimensions ( 2d ) attracts increasing interest .
it is stimulated by the spectacular proposals for prospects to create exotic and highly correlated quantum systems with dipolar gases @xcite .
particularly , there were considered anisotro... | [ txt : abstract ] we study the quantum scattering in two spatial dimensions ( 2d ) without the usual partial - wave formalism .
the analysis beyond the partial - wave approximation allows a quantitative treatment of the anisotropic scattering with a strong coupling of different angular momenta nonvanishing even at t... | arxiv |
within a decade of being identified as a supernova remnant ( snr ) , g65.2@xmath05.7 ( also called g65.3 + 5.7 ) was the subject of several observational papers published in quick succession .
however , once its radio and optical images and its optical and x - ray spectra were recorded , the remnant was ignored .
... | this paper presents archival _ rosat _ pspc observations of the g65.2@xmath05.7 supernova remnant (
also known as g65.3 + 5.7 ) .
little material obscures this remnant and so it was well observed , even at the softest end of _ rosat _ s bandpass ( @xmath1 to 0.28 kev ) .
these soft x - ray images reveal the re... | arxiv |
permutations of the integers @xmath5 = \{1,\ldots , n\}$ ] are a basic building block for the succinct encoding of integer functions @xcite , strings @xcite , and binary relations @xcite , among others .
a permutation @xmath0 is trivially representable in @xmath6 bits , which is within @xmath7 bits of the informat... | we explore various techniques to compress a permutation @xmath0 over @xmath1 integers , taking advantage of ordered subsequences in @xmath0 , while supporting its application @xmath2 and the application of its inverse @xmath3 in small time .
our compression schemes yield several interesting byproducts , in many cases... | arxiv |
about ten years ago , a peculiar dynamical phenomenon was discovered in populations of identical phase oscillators : under nonlocal symmetric coupling , the coexistence of coherent ( synchronized ) and incoherent oscillators was observed @xcite .
this highly counterintuitive phenomenon was given the name chimera stat... | we have identified the occurrence of chimera states for various coupling schemes in networks of two - dimensional and three - dimensional hindmarsh - rose oscillators , which represent realistic models of neuronal ensembles .
this result , together with recent studies on multiple chimera states in nonlocally coupled ... | arxiv |
kauffman networks are disordered dynamical systems proposed by kauffman in 1969 as a model for genetic regulatory systems @xcite .
they attracted the interest of physicists in the 80 s @xcite , due to their analogy with the disordered systems studied in statistical mechanics , such as the mean field spin glass @xcite... | this is the first of two papers about the structure of kauffman networks . in this paper
we define the relevant elements of random networks of automata , following previous work by flyvbjerg @xcite and flyvbjerg and kjaer @xcite , and we study numerically their probability distribution in the chaotic phase and on the... | arxiv |
turbulence is a strong nonequilibrium phenomenon , exhibiting unpredictable behavior of the velocity field , which can result from the multiple degrees of freedom and nonlinearity of fluid systems @xcite .
this situation complicates our understanding of turbulence , making it one of the unresolved problems in modern ... | spin - superflow turbulence ( sst ) in spin-1 ferromagnetic spinor bose - einstein condensates is theoretically and numerically studied by using the spin-1 spinor gross - pitaevskii ( gp ) equations .
sst is turbulence in which the disturbed spin and superfluid velocity fields are coupled . applying the kolmogorov - ... | arxiv |
low - luminosity active galactic nuclei ( llagns ) , operationally defined as a h@xmath0 luminosity of @xmath1 , reside in about 40 per cent of nearby bright galaxies , and occupy majority of the population of agns @xcite .
its low luminosities are thought to be caused by very low accretion rate on to super - massi... | we investigate the high - frequency radio spectra of twenty low - luminosity active galactic nuclei ( llagns ) with compact radio cores .
our millimetre survey with the nobeyama millimetre array ( nma ) and analyses of submillimetre archival data that had been obtained with the submillimetre common user bolometer arr... | arxiv |
scattering , absorption , and reradiation of photons by dust grains affect the propagation of starlight and play a key role in regulating the energy balance in the interstellar medium .
studies of these processes have provided a great deal of insight into the physical and chemical properties of dust grains ( for revi... | we present three methods for measuring the slope of the galactic dust extinction law , @xmath0 , and a method for measuring the fine - scale structure of dust clouds in the direction of differentially - reddened globular clusters .
we apply these techniques to @xmath1 photometry of stars in the low - latitude galact... | arxiv |
heavy - fermion systems @xcite are characterized by a hierarchy of distinctive energy scales @xcite .
the kondo scale , @xmath1 with bandwidth @xmath2 and superexchange @xmath3 , marks the screening of local magnetic moments .
this screening is a many - body effect which entangles the spins of the conduction electr... | we report the results of extensive dynamical cluster approximation calculations , based on a quantum monte carlo solver , for the two - dimensional kondo lattice model .
our particular cluster implementation renders possible the simulation of spontaneous antiferromagnetic symmetry breaking . by explicitly computing t... | arxiv |
the recent discovery at the large hadron collider ( lhc ) of a resonance at 125 gev compatible with the expectations for the higgs particle @xcite represents a major step towards understanding the origin of the mass of fundamental particles .
eventually , this should also affect the other subfield in which mass has a... | we report on a search for differential shifts between electronic and vibronic transitions in carbon - rich white dwarfs bpm 27606 and procyon b. the absence of differential shifts within the spectral resolution and taking into account systematic effects such as space motion and pressure shifts allows us to set the firs... | arxiv |
white dwarf ( wd ) stars represent the end points of stellar evolution for all low - mass stars , and are the fate of more than 97% of all stars in our galaxy .
roughly 80% of wds belong to the spectral class da , with atmospheres characteristically dominated by hydrogen @xcite . when da wds cool to the appropriate t... | we report the discovery of two new pulsating extremely low - mass ( elm ) white dwarfs ( wds ) , sdss j161431.28 + 191219.4 ( hereafter j1614 ) and sdss j222859.93 + 362359.6 ( hereafter j2228 ) .
both wds have masses @xmath0 0.25 @xmath1 and thus likely harbor helium cores .
spectral fits indicate these are the... | arxiv |
the interstellar medium ( ism ) of a typical disk galaxy is divided into variety of distinct phases , generally classified into hot ionized ( @xmath4 ) gas , the warm neutral medium ( wnm ; @xmath5 ) , and the cold neutral medium ( cnm ; @xmath6 ) .
star formation , however , appears to be restricted to cold dense ga... | to understand the conditions under which dense , molecular gas is able to form within a galaxy , we post - process a series of three - dimensional galactic - disk - scale simulations with ray - tracing based radiative transfer and chemical network integration to compute the equilibrium chemical and thermal state of the... | arxiv |
the recent discovery of an overdensity of stars in the color - magnitude diagram ( cmd ) of the large magellanic cloud ( lmc ) having nearly the same color as the `` red clump '' of core he - burning stars but extending @xmath10.9 mag brighter has been interpreted as an intervening population of stars at @xmath2 kpc ... | we examine the morphology of the color - magnitude diagram ( cmd ) for core helium - burning ( red clump ) stars to test the recent suggestion by zaritsky & lin ( 1997 ) that an extension of the red clump in the large magellanic cloud ( lmc ) toward brighter magnitudes is due to an intervening population of stars that ... | arxiv |
it is well - established that the fraction of star - forming galaxies declines as a function of increasing local galaxy density in the low redshift universe .
also known as the star formation - density relation @xcite , this correlation has been confirmed in many studies , primarily using optical and uv data to trace... | we present results from a systematic study of star formation in local galaxy clusters using 22@xmath0 m data from the wide - field infrared survey explorer ( wise ) .
the 69 systems in our sample are drawn from the cluster infall regions survey ( cirs ) , and all have robust mass determinations .
the all - sky wise... | arxiv |
let @xmath0 and @xmath1 be banach spaces over a real or complex field @xmath6 .
we use the traditional notations @xmath7 and @xmath8 for the unit sphere and the closed unit ball of the space @xmath0 , respectively .
the banach space of all bounded linear operators @xmath9 will be represented by @xmath10 .
in part... | in this paper we introduce the strong bishop - phelps - bollobs property ( sbpbp ) for bounded linear operators between two banach spaces @xmath0 and @xmath1 .
this property is motivated by a kim - lee result which states , under our notation , that a banach space @xmath0 is uniformly convex if and only if the pair @... | arxiv |
the analysis of modern accelerator - based neutrino oscillation experiments requires good control over the intermediate - energy neutrino - nucleus scattering cross section @xcite . in particular
the importance of multi - nucleon events has been suggested in many calculations of charge - changing quasielastic cross s... | we present a fast and efficient method to compute the inclusive two - particle two - hole ( 2p-2h ) electroweak responses in the neutrino and electron quasielastic inclusive cross sections .
the method is based on two approximations .
the first neglects the motion of the two initial nucleons below the fermi momentu... | arxiv |
accretion of gas onto a super massive black hole ( smbh ) in the nucleus of galaxies is believed to be the source of activity in quasars and seyfert galaxies ( commonly known as active galactic nuclei ( agns ) ; cf .
rees 1984 ) .
several studies have suggested that the mass of the smbh in these objects is correlat... | we present the results of our optical monitoring campaign of the x - ray source h 0507 + 164 , a low luminosity seyfert 1.5 galaxy at a redshift , @xmath0 .
spectroscopic observations were carried out during 22 nights in 2007 , from the 21 of november to the 26 of december .
photometric observations in the r - ba... | arxiv |
the broad emission iron lines are well - known features found in about two dozens of spectra of active galactic nuclei and black hole binaries .
they are supposed to originate close to the black hole by the reflection of the primary radiation on the accretion disc .
the spin of the black hole plays an important rol... | the analysis of the broad iron line profile in the x - ray spectra of active galactic nuclei and black hole x - ray binaries allows us to constrain the spin parameter of the black hole .
we compare the constraints on the spin value for two x - ray sources , mcg-6 - 30 - 15 and gx 339 - 4 , with a broad iron line usin... | arxiv |
axially symmetric solutions of einstein s field equations corresponding to disklike configurations of matter are of great astrophysical interest , since they can be used as models of galaxies or accretion disks .
these solutions can be static or stationary and with or without radial pressure .
solutions for static ... | using the well - known `` displace , cut and reflect '' method used to generate disks from given solutions of einstein field equations , we construct static disks made of perfect fluid based on vacuum schwarzschild s solution in isotropic coordinates .
the same method is applied to different exact solutions to the ei... | arxiv |
one of the long - sought goals in low - temperature physics is the creation of two interpenetrating superfluids .
early efforts were directed at mixtures of helium isotopes .
more recently , following the experiments with bose - einstein condensates ( bec ) of atomic gases @xcite , considerable efforts have been ma... | we consider a system of two interpenetrating bose - einstein condensates of atoms in two different hyperfine spin states .
we show that in the presence of a small coupling drive between the two spin levels , there exist domain walls across which the relative phase of the two condensates changes by @xmath0 .
we give... | arxiv |
an anomaly in field theory occurs if a symmetry of the action or the corresponding conservation law , valid in the classical theory , is violated in the quantized version .
this surprising feature of quantum theory discovered by adler @xcite , bell and jackiw @xcite , and by bardeen @xcite in 1969 plays a fundamental... | we are dealing with two - dimensional gravitational anomalies , specifically with the einstein anomaly and the weyl anomaly , and we show that they are fully determined by dispersion relations independent of any renormalization procedure ( or ultraviolet regularization ) .
the origin of the anomalies is the existence... | arxiv |
space time explorer & quantum equivalence space test ( ste - quest ) is a medium - sized mission candidate for launch in 2022/2024 in the cosmic vision programme of the european space agency .
after recommendation by the space science advisory committee , it was selected to be first studied by esa , followed by two p... | ste - quest is a fundamental science mission which is considered for launch within the cosmic vision programme of the european space agency ( esa ) .
its main scientific objectives relate to probing various aspects of einstein s theory of general relativity by measuring the gravitational red - shift of the earth , th... | arxiv |
pulsed high - frequency ( hf ) electromagnetic ( em ) waves from transmitters on the ground are regularly used for sounding the density profile and drift velocity of the overehead ionosphere [ _ hunsucker _ , 1991 ; _ reinisch et al .
_ , 1995 , _ reinisch _ , 1996 ] .
in 1971 , it was shown theoretically by _ perk... | the time evolution of a large - amplitude electromagnetic ( em ) wave injected vertically into the overhead ionosphere is studied numerically .
the em wave has a carrier frequency of 5 mhz and is modulated as a gaussian pulse with a width of approximately 0.1 milliseconds and a vacuum amplitude of 1.5 v / m at 50 km ... | arxiv |
the mott - hubbard model of interacting bosons on a lattice has been used to describe superfluid mott - insulator transitions in a variety of systems , e.g. , josephson arrays and granular superconductors @xcite .
the recent suggestion @xcite to experimentally observe this transition in a system of cold bosonic atoms... | we study the mott - insulator transition of bosonic atoms in optical lattices .
using perturbation theory , we analyze the deviations from the mean - field gutzwiller ansatz , which become appreciable for intermediate values of the ratio between hopping amplitude and interaction energy .
we discuss corrections to n... | arxiv |
cosmological models with scalar field matter have been much studied in the context of inflation and , more recently , in the context of the late - time acceleration that is indicated by current astronomical observations ( see @xcite for a recent review ) .
one theoretical motivation for these studies is that scalar f... | for gravity coupled to @xmath0 scalar fields , with arbitrary potential @xmath1 , it is shown that all flat ( homogeneous and isotropic ) cosmologies correspond to geodesics in an @xmath2-dimensional ` augmented ' target space of lorentzian signature @xmath3 , timelike if @xmath4 , null if @xmath5 and spacelike if @xma... | arxiv |
in the course of an extensive search for very wide , common proper motion companions to nearby hipparcos stars from the nomad catalog @xcite , we came across an optically faint and red star at an angular separation of @xmath5 , position angle @xmath6 from the active and rapidly rotating g9v star hip 115147 ( bd + 78 82... | we report a late m - type , common proper motion companion to a nearby young visual binary hip 115147 ( v368 cep ) , separated by 963 arcseconds from the primary k0 dwarf .
this optically dim star has been identified as a candidate high proper motion , nearby dwarf lspm j2322 + 7847 by lpine in 2005 .
the wide comp... | arxiv |
in recent years , many cosmological observations have provided the strong evidence that the universe is flat and its energy density is dominated by the dark energy component whose negative pressure causes the cosmic expansion to accelerate @xcite@xmath0@xcite . in order to clarify the origin of the dark energy ,
one ... | we discuss the effect of the supersymmetry breaking on the mass varying neutrinos(mavans ) scenario . especially , the effect mediated by the gravitational interaction between the hidden sector and the dark energy sector is studied . a model including a chiral superfield in the dark sector and the right handed neutrino... | arxiv |
the _ quark gluon plasma _ ( @xmath0 ) usually is defined as the phase of _ quantum chromodynamics _ ( @xmath2 )
in which the quarks and gluons degrees of freedom , that is normally confined within the hadrons , are mostly liberated .
the possible phases of the @xmath2 and the precise locations of critical boundari... | the thermodynamic properties of the _ quark gluon plasma _ ( @xmath0 ) as well as its phase diagram are calculated as a function of baryon density ( chemical potential ) and temperature .
the @xmath0 is assumed to be composed of the light quarks only , i.e. the up and the down quarks , which interact weakly and the g... | arxiv |
in ref . @xcite an @xmath7 conformally symmetric model was proposed for strong interactions at low energies , based on the observation , published in 1919 by h. weyl in ref .
@xcite , that the dynamical equations of gauge theories retain their flat - space - time form when subject to a conformally - flat metrical f... | we present evidence for the existence of a light scalar particle that most probably couples exclusively to gluons and quarks .
theoretical and phenomenological arguments are presented to support the existence of a light scalar boson for confinement and quark - pair creation .
previously observed interference effect... | arxiv |
the term ` stochastic resonance ' was introduced in the early 80s ( see @xcite and @xcite ) in the study of periodic advance of glaciers on earth .
the stochastic resonance is the effect of nonmonotone dependence of the response of a system on the noise when this noise ( for instance the temperature ) is added to a ... | a subthreshold signal is transmitted through a channel and may be detected when some noise with known structure and proportional to some level is added to the data .
there is an optimal noise level , called stochastic resonance , that corresponds to the highest fisher information in the problem of estimation of the... | arxiv |
the order parameter in high - temperature superconductors ( hts ) has been proved to have mainly a @xmath4 pairing symmetry.@xcite in particular , try - crystal phase - sensitive measurements @xcite have determined the presence of a predominant @xmath5gap symmetry up to the superconducting critical temperature @xmath1 ... | the angle dependence at different temperatures of the longitudinal thermal conductivity @xmath0 in the presence of a planar magnetic field is presented . in order to study the influence of the gap symmetry on the thermal transport ,
angular scans were measured up to a few kelvin below the critical temperature @xmath1... | arxiv |
_ dehn surgery _ is an operation to modify a three - manifold by drilling and then regluing a solid torus .
denote by @xmath6 the resulting three - manifold via dehn surgery on a knot @xmath0 in @xmath7 along a slope @xmath8 .
two dehn surgeries along @xmath0 with distinct slopes @xmath8 and @xmath9 are called _ pu... | we show that two dehn surgeries on a knot @xmath0 never yield manifolds that are homeomorphic as oriented manifolds if @xmath1 or @xmath2 . as an application
, we verify the cosmetic surgery conjecture for all knots with no more than @xmath3 crossings except for three @xmath4-crossing knots and five @xmath3-crossing ... | arxiv |
anomaly - mediated supersymmetry breaking ( amsb ) models have received much attention in the literature due to their attractive properties@xcite : the soft supersymmetry ( susy ) breaking terms are completely calculable in terms of just one free parameter ( the gravitino mass , @xmath11 ) , the soft terms are real and... | we investigate the phenomenological consequences of string models wherein the mssm resides on a d - brane , and the hypercharge gaugino mass is generated in a geometrically separated hidden sector .
this hypercharged anomaly - mediated susy breaking ( hcamsb ) model naturally solves the tachyonic slepton mass problem... | arxiv |
the ideas of zero range potential ( zrp ) approach were recently developed to widen limits of the traditional treatment by demkov and ostrovsky @xmath4 and albeverio et al . @xmath5 .
the advantage of the theory is the possibility of obtaining an exact solution of scattering problem .
the zrp is conventionally repr... | a dressing of a nonspherical potential , which includes @xmath0 zero range potentials , is considered .
the dressing technique is used to improve zrp model .
concepts of the partial waves and partial phases for non - spherical potential are used in order to perform darboux transformation .
the problem of scatteri... | arxiv |
the convection - diffusion model can be expressed mathematically , which is a semi linear parabolic partial differential equation .
specially , we consider an initial value system of _ convection - diffusion _ equation in @xmath3 dimension as : @xmath4,\ ] ] together with the dirichlet boundary conditions : @xmath5,\... | this paper deals with the numerical computations of two space dimensional time dependent _ parabolic partial differential equations _ by adopting adopting an optimal five stage fourth - order strong stability preserving runge - kutta ( ssp - rk54 ) scheme for time discretization , and three methods of differential quad... | arxiv |
surveys with bolometer arrays at millimetre ( mm ) and submillimetre ( submm ) wavelengths are potentially sensitive to dusty objects at extreme redshifts , galaxies that drop out of surveys at shorter and longer wavelengths due to obscuration and unfavourable @xmath11 corrections .
the first cosmological surveys usi... | the modest significance of most sources detected in current ( sub)millimetre surveys can potentially compromise some analyses due to the inclusion of spurious sources in catalogues typically selected at @xmath03.03.5@xmath1 . here ,
we develop and apply a dual - survey extraction technique to scuba and mambo images o... | arxiv |
with the introduction of efficient multi - object spectrographs on 4m - class telescopes , it has become possible to construct large samples of faint galaxies with measured redshifts .
with such a sample , one can compute the luminosity function ( lf ) of galaxies as a function of redshift and thereby directly observ... | we measure the field galaxy luminosity function ( lf ) as a function of color and redshift from @xmath0 to @xmath1 using galaxies from the norris survey of the corona borealis supercluster .
the data set consists of 603 field galaxies with @xmath2 and spans a wide range in apparent magnitude ( @xmath3 ) , although ou... | arxiv |
over the past few years rapidity gaps , i.e. pseudorapidity regions without hadronic activity , have been observed in hadronic collisions at both the hera @xmath7 collider @xcite and in @xmath8 collisions at the fermilab tevatron @xcite .
such rapidity gaps are widely attributed to the exchange of color singlet qua... | rapidity gaps between two hard jets at the tevatron have been interpreted as being due to the exchange of two gluons which are in an overall color - singlet state .
we show that this simple picture involves unitarity violating amplitudes .
unitarizing the gluon exchange amplitude leads to qualitatively different pr... | arxiv |
numerous techniques for forecasting electric energy consumption have been proposed in the last few decades . for operators , energy consumption ( load )
forecast is useful in effectively managing power systems .
consumers can also benefit from the forecasted information in order to yield maximum satisfaction .
in... | due to imprecision and uncertainties in predicting real world problems , artificial neural network ( ann ) techniques have become increasingly useful for modeling and optimization .
this paper presents an artificial neural network approach for forecasting electric energy consumption . for effective planning and opera... | arxiv |
low mass x - ray binaries ( lmxbs ) are compact binaries where the primary is a compact object and the secondary a low mass star ( @xmath81@xmath7 ) .
the secondary is transferring mass via roche - lobe overflow , forming an accretion disk around the compact object that gives rise to the observed x - rays . by far , ... | two nights of phase - resolved medium resolution vlt spectroscopy of the extra - galactic low mass x - ray binary lmcx-2 have revealed a 0.32@xmath00.02 day spectroscopic period in the radial velocity curve of the heii @xmath14686 emission line that we interpret as the orbital period .
however , similar to previous f... | arxiv |
undoubtedly the axial anomaly represents a fundamental issue for understanding the basic aspects of quantum field theory .
this issue has been analysed deeply over the years .
+ the anomaly problem has been treated by means of renormalization procedure , giving the interpretation of its origin in terms of ultraviol... | we discuss a connection between axial anomaly and polarized radiative processes . by comparison with the corresponding unpolarized cases , we consider some physical outputs for the @xmath0 and @xmath1 polarized radiative decays .
we analyse in detail the pattern of mass singularity cancellation .
uprf-00 - 10 + jun... | arxiv |
lease take a look at the images in the top row of fig .
[ fig : fig1 ] .
which object stands out the most ( i.e. , is the most salient one ) in each of these scenes ?
the answer is trivial .
there is only one object , thus it is the most salient one .
now , look at the images in the third row .
these scenes... | salient object detection or salient region detection models , diverging from fixation prediction models , have traditionally been dealing with locating and segmenting the most salient object or region in a scene .
while the notion of most salient object is sensible when multiple objects exist in a scene , current dat... | arxiv |
in their papers @xcite , @xcite , @xcite , ozsvth and szab constructed a decorated topological quantum field theory ( tqft ) in @xmath0 dimensions , called heegaard floer theory .
( strictly speaking , the axioms of a tqft need to be altered slightly . ) in its simplest version ( called hat ) , to a closed , connecte... | in a previous paper , sarkar and the third author gave a combinatorial description of the hat version of heegaard floer homology for three - manifolds . given a cobordism between two connected three - manifolds , there is an induced map between their heegaard floer homologies .
assume that the first homology group of... | arxiv |
it is the purpose of this paper to extend the results of yetter @xcite , generalizing classical results of gerstenhaber @xcite and gerstenhaber and schack @xcite on the infinitesimal deformation theory of associative algebras and poset - indexed diagrams of associative algebras to a deformation theory for arbitrary pas... | we continue the development of the infinitesimal deformation theory of pasting diagrams of @xmath0-linear categories begun in @xcite . in @xcite
the standard result that all obstructions are cocycles was established only for the elementary , composition - free parts of pasting diagrams . in the present work we give a... | arxiv |
our aim in physics is not only to calculate some observable and get a correct number but mainly to understand a physical picture responsible for the given phenomenon .
it very often happens that a theory formulated in terms of fundamental degrees of freedom can not answer such a question since it becomes overcomplica... | in the low - energy regime light and strange baryons should be considered as systems of constituent quarks with confining interaction and a chiral interaction that is mediated by goldstone bosons as well as by vector and scalar mesons .
the flavor - spin structure and sign of the short - range part of the spin - spin... | arxiv |
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