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1110.3870
i
present study deals with the model calculations of co cameron band and @xmath4doublet ultraviolet emissions in martian dayglow and the impact of solar euv flux on the calculated intensities . photoelectrons generated due to photoionization in the martian atmosphere have been degraded in the atmosphere using monte carlo...
calculated limb intensities profiles are compared with spicam / mars express and mariner observations . analytical yield spectrum densities of prominent ions and co molecule in excited triplet a state are calculated using major ion - neutral reactions . volume emission rates of co cameron and co uv doublet bands have b...
this study is aimed at making a calculation about the impact of the two most commonly used solar euv flux models solar2000 ( s2k ) of and euvac model of on photoelectron fluxes , volume emission rates , ion densities and co cameron and co uv doublet band dayglow emissions on mars in three solar activity conditions : ...
1702.08003
i
one of the most elementary system configuation models in multi - user information theory is the broadcast channel ( bc ) . it has been introduced in the early seventies of the twentieth century by cover @xcite , and since then , a vast amount of papers and books , studying different topics of the broadcast problem , ha...
this work contains two main contributions concerning the asymmetric broadcast channel . the first is an analysis of the exact random coding error exponents for both users , and the second is the derivation of universal decoders for both users . these universal decoders are certain variants of the maximum mutual informa...
this work contains two main contributions concerning the asymmetric broadcast channel . the first is an analysis of the exact random coding error exponents for both users , and the second is the derivation of universal decoders for both users . these universal decoders are certain variants of the maximum mutual informa...
0805.3731
i
new @xmath9-dimensional @xmath0- and @xmath1- and @xmath2-transforms were recently described in @xcite . each transform is based on a compact semisimple lie group of rank @xmath9 and comes in three versions : analogs of fourier series , fourier integrals , and fourier transforms on an @xmath9-dimensional lattice . the...
three dimensional continuous and discrete fourier - like transforms , based on the three simple and four semisimple compact lie groups of rank 3 , are presented . for each simple lie group , pertinent properties of the functions are described in detail , such as their orthogonality within each family , when integrated ...
three dimensional continuous and discrete fourier - like transforms , based on the three simple and four semisimple compact lie groups of rank 3 , are presented . for each simple lie group , there are three families of special functions (- ,- , and-functions ) on which the transforms are built . pertinent properties of...
1003.2341
i
tio@xmath0 has been one of the most studied oxides over the past few years . this is due to the broad range of applications it offers in strategic fields of scientific , technological , environmental , and commercial relevance . in particular , tio@xmath0 surfaces and nanocrystals provide a rich variety of suitably tun...
titanium dioxide is one of the most widely investigated oxides . this is due to its broad range of applications , from catalysis to photocatalysis to photovoltaics . despite this large interest , many of its bulk properties further , some of tio s most important properties , such as its electronic band gap , the locali...
titanium dioxide is one of the most widely investigated oxides . this is due to its broad range of applications , from catalysis to photocatalysis to photovoltaics . despite this large interest , many of its bulk properties have been sparsely investigated using either experimental techniques or _ ab initio _ theory . f...
0905.4683
i
determining the physical parameters of large samples of galaxies is crucial to constrain our knowledge of the complicated physical processes that govern the formation and evolution of these systems . ultimately , we seek methods that quickly and effectively map observed data from @xmath0 galaxies to sets of parameters ...
to further our knowledge of the complex physical process of galaxy formation , it is essential that we characterize the formation and evolution of large databases of galaxies . the spectral synthesis starlight code of cid fernandes et al . ( 2004 ) was designed for this purpose . results of starlight are highly depende...
to further our knowledge of the complex physical process of galaxy formation , it is essential that we characterize the formation and evolution of large databases of galaxies . the spectral synthesis starlight code of cid fernandes et al . ( 2004 ) was designed for this purpose . results of starlight are highly depende...
0905.4683
m
we adopt the model of galaxy spectra as a mixture of simple systems introduced in @xcite : @xmath3 where @xmath4 is the model flux in wavelength bin @xmath5 . the component @xmath6 is the @xmath7th basis spectrum normalized at wavelength @xmath8 . the basis of ssp spectra @xmath9 is chosen before performing the analysi...
speed of the code , which uses random walks through the parameter space , scales as the square of the number of basis spectra , making it computationally necessary to choose a small number of ssps that are coarsely sampled in age and metallicity . in this paper , we develop methods based on diffusion map ( lafon & lee ...
to further our knowledge of the complex physical process of galaxy formation , it is essential that we characterize the formation and evolution of large databases of galaxies . the spectral synthesis starlight code of cid fernandes et al . ( 2004 ) was designed for this purpose . results of starlight are highly depende...
astro-ph0003109
i
galaxies do not live isolated lives , but exist in the tidal fields of their environment . arp ( 1966 ) , in his atlas of peculiar galaxies , lay the observational groundwork for the modern study of interacting galaxy systems by identifying many `` peculiar '' systems , later interpreted as various stages of major gala...
to investigate the link between weak tidal interactions in disk galaxies and the boosting of their recent star formation , we obtain images and spatially integrated spectra ( ) for 40 late - type spiral galaxies ( sab - sbc ) with varying degrees of lopsidedness ( a dynamical indicator of weak interactions ) . we quant...
to investigate the link between weak tidal interactions in disk galaxies and the boosting of their recent star formation , we obtain images and spatially integrated spectra ( ) for 40 late - type spiral galaxies ( sab - sbc ) with varying degrees of lopsidedness ( a dynamical indicator of weak interactions ) . we quant...
astro-ph0003109
i
to quantify the correlation between the recent sf histories of present - day spiral galaxies and their global asymmetry , we compare the integrated spectral properties of late - type spirals of varying lopsidedness . we find that the recent ( @xmath159 gyr ) sfh and current ( @xmath160 years ) sfr are both strongly cor...
the median spectrum of the most lopsided galaxies shows strong evidence for a more prominent young stellar population ( i.e. strong balmer absorption , strong nebular emission , a weak break and a blue continuum ) when compared to the median spectrum of the most symmetric galaxies . using the evolutionary population sy...
to investigate the link between weak tidal interactions in disk galaxies and the boosting of their recent star formation , we obtain images and spatially integrated spectra ( ) for 40 late - type spiral galaxies ( sab - sbc ) with varying degrees of lopsidedness ( a dynamical indicator of weak interactions ) . we quant...
1105.1482
i
the relationship between the transmitted symbol and the received signal vector in many communication systems can be expressed in the form @xmath1 where @xmath2 is the @xmath3 transmitted vector whose entries are chosen from a finite symbol alphabet , @xmath4 and @xmath5 are the @xmath6 received signal and noise vectors...
tree detection techniques are often used to reduce the complexity of _ a posteriori probability _ ( app ) detection in high dimensional multi - antenna wireless communication systems . in this paper , we introduce an efficient soft - input soft - output tree detection algorithm that employs a new type of look - ahead p...
tree detection techniques are often used to reduce the complexity of _ a posteriori probability _ ( app ) detection in high dimensional multi - antenna wireless communication systems . in this paper , we introduce an efficient soft - input soft - output tree detection algorithm that employs a new type of look - ahead p...
1312.6129
i
turbulence is a common phenomenon in astrophysical fluids ( see , for example , elmegreen & scalo 2004 ) and it is obvious that most astrophysical fluids are permeated by magnetic fields ( brandenburg & subramanian 2005 ) . such magnetized fluids can be investigated by numerical simulations of driven magnetohydrodynami...
turbulence is ubiquitous in astrophysical fluids such as the interstellar medium ( ism ) and the intracluster medium ( icm ) . in turbulence studies , it is customary to assume that fluid is driven on a single scale . however , in astrophysical fluids , there can be many different driving mechanisms that act on differe...
turbulence is ubiquitous in astrophysical fluids such as the interstellar medium ( ism ) and the intracluster medium ( icm ) . in turbulence studies , it is customary to assume that fluid is driven on a single scale . however , in astrophysical fluids , there can be many different driving mechanisms that act on differe...
0704.3889
c
we have compared the predictions for the liquid - vapour coexistence curve of a long - range yukawa fluid obtained from advanced theoretical approaches with gibbs ensemble monte carlo simulations . concerning the simulations care has to be taken when the range of the potential exceeds the length of the simulation box ....
two liquid state theories , the self - consistent ornstein - zernike equation ( scoza ) and the hierarchical reference theory ( hrt ) are shown , by comparison with monte carlo simulations , to perform extremely well in predicting the liquid - vapour coexistence of the hard core yukawa ( hcy ) fluid when the interactio...
two liquid state theories , the self - consistent ornstein - zernike equation ( scoza ) and the hierarchical reference theory ( hrt ) are shown , by comparison with monte carlo simulations , to perform extremely well in predicting the liquid - vapour coexistence of the hard core yukawa ( hcy ) fluid when the interactio...
0709.1114
i
in the past several years h@xmath0 has been detected in diffuse interstellar clouds @xcite where it had been expected to exist in abundances below observable limits . this surprising result raised various questions about the diffuse cloud environment . the rather simple chemistry of h@xmath0 allows for only three var...
h is detected in eight diffuse cloud sightlines with column densities varying from to . because of the simple chemistry associated with h production and destruction , these column density measurements can be used in concert with various other data to infer the primary cosmic - ray ionization rate , .
using high resolution infrared spectroscopy we have surveyed twenty sightlines for h absorption . h is detected in eight diffuse cloud sightlines with column densities varying from to . this brings to fourteen the total number of diffuse cloud sightlines where h has been detected . these detections are mostly alo...
0709.1114
c
values of the cosmic - ray ionization rate for diffuse clouds observed here as well as those determined for other diffuse clouds observed previously by us are given in the right hand column of table [ tbl4 ] . the detected values in the lines of sight to fourteen sources cover the range 0.53.2@xmath71 s@xmath6 . upper...
these detections are mostly along sightlines concentrated in the galactic plane , but well dispersed in galactic longitude . values range from s to s with an average of s . where h is not detected the upper limits on the ionization rate are consistent with this range . the average value of is about an order of magn...
using high resolution infrared spectroscopy we have surveyed twenty sightlines for h absorption . h is detected in eight diffuse cloud sightlines with column densities varying from to . this brings to fourteen the total number of diffuse cloud sightlines where h has been detected . these detections are mostly alo...
1210.6353
i
both theoretically and observationally , core - collapse supernova ( ccsn ) explosions are linked with the death of massive stars . however , because precise measurements of ccsn progenitor masses are scarce , the mapping between explosion scenario and the progenitor mass distribution is less clear . the most common me...
application of stellar evolution models allows us to infer thefrom this age . because our technique is not contingent on identification or precise location of the progenitor star , it can be applied to the location of any known snr . if we assume a single power law distribution , , we find a distribution that is steepe...
using hubble space telescope ( hst ) photometry , we age - date 59 supernova remnants ( snrs ) in the spiral galaxy m31 and use these ages to estimate zero - age main sequence masses ( ) for their progenitors . to accomplish this , we create color - magnitude diagrams ( cmds ) and employ cmd fitting to measure the rece...
1210.6353
m
the basic procedure for deriving a mass estimate for each progenitor is as follows . we first use coordinates from three snr catalogs as explained in 2.2 , which we assume are accurate to within a few arcseconds and unbiased to any one type of sn . we then search for any appropriate hst fields that contain the snr in ...
, we create color - magnitude diagrams ( cmds ) and employ cmd fitting to measure the recent star formation history ( sfh ) of the regions surrounding cataloged snr sites . we identify any young coeval population that likely produced the progenitor star , then assign an age and uncertainty to that population . we ident...
using hubble space telescope ( hst ) photometry , we age - date 59 supernova remnants ( snrs ) in the spiral galaxy m31 and use these ages to estimate zero - age main sequence masses ( ) for their progenitors . to accomplish this , we create color - magnitude diagrams ( cmds ) and employ cmd fitting to measure the rece...
1210.6353
c
our method measures the prominence of a burst as a fraction of the total recent sf . this approach requires that we define the period of time that we consider as `` recent '' sf . specifically , we must identify the age range where star formation can produce stars massive enough to result in ccsne . theoretical argumen...
using hubble space telescope ( hst ) photometry , we age - date 59 supernova remnants ( snrs ) in the spiral galaxy m31 and use these ages to estimate zero - age main sequence masses ( ) for their progenitors . to accomplish this we consider the remaining 6 snrs as either probable type ia candidates or the result of co...
using hubble space telescope ( hst ) photometry , we age - date 59 supernova remnants ( snrs ) in the spiral galaxy m31 and use these ages to estimate zero - age main sequence masses ( ) for their progenitors . to accomplish this , we create color - magnitude diagrams ( cmds ) and employ cmd fitting to measure the rece...
1502.03583
r
in bulk a fluid of hard rectangles of aspect ratio @xmath1 undergoes a phase transition from an isotropic to a nematic phase upon increasing the density @xcite . the bulk transition is continuous , presumably of the kosterlitz - thouless type @xcite . the aim of the present work is to study confinement properties , and...
we present results for the state diagram as a function of the packing fraction and the degree of confinement . under extreme confinement , unexpected states appear with lower symmetries than those of the corresponding stable states in bulk , such as the formation of states that break the anchoring constraints or the sy...
using monte carlo simulation , we analyse the behaviour of two - dimensional hard rods in four different types of geometric confinement : ( i ) a slit pore where the particles are confined between two parallel walls with homeotropic anchoring ; ( ii ) a hybrid slit pore formed by a planar and a homeotropic wall ; squar...
1502.03583
c
in summary , we have performed a systematic analysis of the behaviour of two - dimensional hard rods confined in slit pores and in square cavities . in the case of slit pores we have shown that our simple hard core model contains much of the phenomenology observed in corresponding confined three dimensional systems . e...
using monte carlo simulation , we analyse the behaviour of two - dimensional hard rods in four different types of geometric confinement : ( i ) a slit pore where the particles are confined between two parallel walls with homeotropic anchoring ; ( ii ) a hybrid slit pore formed by a planar and a homeotropic wall ; squar...
using monte carlo simulation , we analyse the behaviour of two - dimensional hard rods in four different types of geometric confinement : ( i ) a slit pore where the particles are confined between two parallel walls with homeotropic anchoring ; ( ii ) a hybrid slit pore formed by a planar and a homeotropic wall ; squar...
1009.2140
i
the magnetic field is an essential ingredient in present - day star formation . observations have shown that molecular cloud cores have magnetic energy comparable to gravitational energy @xcite . the cloud cores also have angular momentum @xcite . stars are born in such cloud cores . as the cloud collapses , the centra...
, however , the circumstellar disk grows rapidly and exceedsau by the end of the main accretion phase . this rapid growth of the circumstellar disk is caused by the depletion of the infalling envelope , while magnetic braking is effective when the infalling envelope is more massive than the circumstellar disk . the inf...
using resistive magnetohydrodynamics simulation , we investigate circumstellar disk formation in a strongly magnetized cloud . as the initial state , an isolated cloud core embedded in a low - density interstellar medium with a uniform magnetic field is adopted . the cloud evolution is calculated until almost all gas i...
1009.2140
c
in this paper , to investigate the formation of the circumstellar disk in a realistic setting , we set a dense molecular cloud core embedded in a low - density interstellar medium in a large simulation box with size 16 times the radius of the molecular cloud core , in which a uniform magnetic field parallel to the rota...
using resistive magnetohydrodynamics simulation , we investigate circumstellar disk formation in a strongly magnetized cloud . as the initial state , an isolated cloud core embedded in a low - density interstellar medium with a uniform magnetic field the cloud evolution is calculated until almost all gas inside the ini...
using resistive magnetohydrodynamics simulation , we investigate circumstellar disk formation in a strongly magnetized cloud . as the initial state , an isolated cloud core embedded in a low - density interstellar medium with a uniform magnetic field is adopted . the cloud evolution is calculated until almost all gas i...
0706.2473
c
we use the simple population synthesis to model the stellar contributions in double - peaked sdss agns . the reliable stellar velocity dispersions are obtained for 52 medium - luminous double - peaked sdss agns with obvious stellar features . we find that : 1 ) the black hole mass is from @xmath173 to @xmath174 and the...
the stellar velocity dispersions ( ) are obtained for 52 double - peaked agns with obvious stellar absorption features , ranging from 106 to 284 ^-1 km s . the black hole masses are calculated to range from to , and the eddington ratio from about 0.01 to about 1 . we find that far deviates from 0.75 , suggesting the n...
using the stellar population synthesis , we model the stellar contribution for a sample of 110 double - peaked broad - lines agns from the sloan digital sky survey ( sdss ) . the stellar velocity dispersions ( ) are obtained for 52 double - peaked agns with obvious stellar absorption features , ranging from 106 to 284 ...
1511.04705
c
we have investigated , by means of numerical transfer - matrix approach in the angular - momentum space , the effects of the skew - interlayer hopping integrals ( the trigonal warping ) on selected transport characteristics of bilayer - graphene ( blg ) corbino disks . additionally , the analytical mode - matching for ...
using the transfer matrix in the angular - momentum space we investigate the impact of trigonal warping on magnetotransport and scaling properties of a ballistic bilayer graphene in the corbino geometry . although the conductivity at the charge - neutrality point and zero magnetic field exhibits a one - parameter scal...
using the transfer matrix in the angular - momentum space we investigate the impact of trigonal warping on magnetotransport and scaling properties of a ballistic bilayer graphene in the corbino geometry . although the conductivity at the charge - neutrality point and zero magnetic field exhibits a one - parameter scal...
1010.4673
i
this article is about the properties of a quantum statistical ensemble , which is , in a sense , opposite to the conventional micro - canonical ensemble . it is an extension of the previous work of one of us@xcite . the present work contains a discussion of underlying conceptual issues and detailed analytical and numer...
usual approach to the foundations of quantum statistical physics is based on conventional micro - canonical ensemble as a starting point for deriving boltzmann - gibbs ( bg ) equilibrium . it leaves , however , a number of conceptual and practical questions unanswered . here we discuss these questions , thereby motivat...
usual approach to the foundations of quantum statistical physics is based on conventional micro - canonical ensemble as a starting point for deriving boltzmann - gibbs ( bg ) equilibrium . it leaves , however , a number of conceptual and practical questions unanswered . here we discuss these questions , thereby motivat...
1010.4673
c
in conclusion , we have demonstrated that the large-@xmath29 analytical description of the qmc ensemble developed in ref.@xcite allows one to make good predictions for the monte - carlo sampling of the qmc ensemble for finite-@xmath29 systems . the description of ref.@xcite is amenable to finite-@xmath29 corrections , ...
we demonstrate that the variance of energy fluctuations can be used to discriminate the qmc equilibrium from the bg equilibrium . we further suggest that the reason , why bg equilibrium commonly occurs in nature rather than the qmc - type equilibrium , has something to do with the notion of quantum collapse .
usual approach to the foundations of quantum statistical physics is based on conventional micro - canonical ensemble as a starting point for deriving boltzmann - gibbs ( bg ) equilibrium . it leaves , however , a number of conceptual and practical questions unanswered . here we discuss these questions , thereby motivat...
1412.1086
i
several recent experiments @xcite have provided strong evidence for a dramatic change in the nature of the low temperature electronic state of the hole - doped cuprate superconductors near optimal doping ( @xmath0 ) . moreover , zero field photoemission experiments carried out in the normal state have seen evidence for...
the theory contains a quantum phase transition between metals with large and small fermi surfaces of spinless fermions carrying the electromagnetic charge of the electron , but the transition does not directly involve any broken global symmetries . this higgs field measures the local antiferromagnetic correlations in a...
we analyze a candidate theory for the strange metal near optimal hole - doping in the cuprate superconductors . the theory contains a quantum phase transition between metals with large and small fermi surfaces of spinless fermions carrying the electromagnetic charge of the electron , but the transition does not directl...
0801.2159
i
the galactic bulge underwent an intense burst of star formation early in the formation of the galaxy , leading to a very different stellar population and chemical evolution history than found in the milky way disk or halo ( e.g. , * ? ? ? * ; * ? ? ? * ; * ? ? ? * ) . in particular , massive stars may dominate the poll...
we analyze a high - resolution spectrum of a microlensed g - dwarf in the galactic bulge , acquired when the star was magnified by a factor of 110 . we find that the abundance ratios of alpha and iron - peak elements are similar to those of bulge giants with the same metallicity .
we analyze a high - resolution spectrum of a microlensed g - dwarf in the galactic bulge , acquired when the star was magnified by a factor of 110 . we measure a spectroscopic temperature , derived from the wings of the balmer lines , that is the same as the photometric temperature , derived using the color determined ...
0801.2159
r
in table 2 , we summarize the abundances measured for 17 elements in . we include both log@xmath54 and its error , as well as [ x / fe ] and its error . to give an idea of the uncertainty due to scatter from the lines , rather than from atmospheric parameters , we give @xmath57 , the rms of abundances derived from ind...
for the first time , we measure the abundances of k and zn for a star in the bulge . the [ k / mg ] ratio is similar to the value measured in the halo and the disk , suggesting that k production closely tracks production . the [ cu / fe ] and [ zn / fe ] ratios support the theory that those elements are produced in typ...
we analyze a high - resolution spectrum of a microlensed g - dwarf in the galactic bulge , acquired when the star was magnified by a factor of 110 . we measure a spectroscopic temperature , derived from the wings of the balmer lines , that is the same as the photometric temperature , derived using the color determined ...
astro-ph0110235
c
the previous section shows that a simple analysis , not taking into account morphology or activity level ( h@xmath0 luminosity ) of the galaxies , gives that the percentage of liners , transition and absorption line galaxies with nearby companions is significantly higher than that of seyferts and hii galaxies . this re...
the comparison of the percentage of galaxies with nearby companions showed that there is a higher percentage of liners , transition , and absorption line galaxies with companions than seyferts and hii galaxies . however , we find that when we consider only galaxies of similar morphological types ( ellipticals or spiral...
we analyze the idea that nuclear activity , either agn or star formation , can be triggered by interactions , studying the percentage of active , hii and quiescent galaxies with companions . our sample was selected from the palomar survey , and avoids selection biases faced by previous studies . this sample was split i...
astro-ph0703350
i
fluorescent fe k lines are common in the x - ray spectra of accreting black holes , ranging from x - ray binaries to active galactic nuclei ( agns ) , and provide one of the best probes for studying accretion disks . if the fe k line is emitted from the inner part of the accretion disk , it becomes broad and asymmetric...
we analyze x - ray spectra of 43 palomar - green quasars observed with _ a feature resembling an emission line at 6.4 kev , identified with an fe k line , is detected in 33 objects . the fe line is relatively narrow (kev ) , with a center energy of 6.48kev and a mean equivalent width ( ew ) of 248ev . by combining blac...
we analyze x - ray spectra of 43 palomar - green quasars observed with _ xmm - newton _ in order to investigate their mean fe k line profile and its dependence on physical properties . the continuum spectra of 39 objects are well reproduced by a model consisting of a power law and a blackbody modified by galactic absor...
astro-ph0703350
r
the spectra of most objects are not well represented by a simple power law ; soft excess emission and an emission line - like feature around 6 kev are also often seen . therefore , we considered a model consisting of a power law , a blackbody component to represent the soft excess emission below @xmath9 2kev , and a ga...
xmm - newton _ in order to investigate their mean fe k line profile and its dependence on physical properties . approximately half of the sample show an absorption feature around 0.650.95 kev , which is due to absorption lines and edges of and . we fit the entire sample simultaneously to derive average fe line paramete...
we analyze x - ray spectra of 43 palomar - green quasars observed with _ xmm - newton _ in order to investigate their mean fe k line profile and its dependence on physical properties . the continuum spectra of 39 objects are well reproduced by a model consisting of a power law and a blackbody modified by galactic absor...
astro-ph0703350
c
we examined mean fe k line shapes for the four groups sorted by the eddington ratios , and found that the peak energy , width , and equivalent width become higher ( 6.4 to 6.8kev ) , broader ( 0.1 to 0.7kev ) , and larger ( 130 to 280ev ) , respectively , as the eddington ratio increases . in this section , we discuss ...
we examine the dependence of the fe k line profile on eddington ratio . as the eddington ratio increases , the line becomes systematically stronger ( ew = 130 to 280 ev ) , broader ( to 0.7kev ) , and peaks at higher energies ( 6.4 to 6.8kev ) .
we analyze x - ray spectra of 43 palomar - green quasars observed with _ xmm - newton _ in order to investigate their mean fe k line profile and its dependence on physical properties . the continuum spectra of 39 objects are well reproduced by a model consisting of a power law and a blackbody modified by galactic absor...
1101.5939
i
in this paper , we have investigated s - wave proton deuteron scattering in pionless effective field theory . in the quartet channel , we have calculated the elastic scattering phase shift up to using the power counting for coulomb contributions suggested by rupak and kong @xcite . the coulomb effects are included a...
deuteron scattering in the framework of pionless effective field theory . in the quartet channel , we calculate the elastic scattering phase shift up to next - to - next - to - leading order in the power counting . in the doublet channel , we perform a next - to - leading order calculation . we obtain good agreement wi...
we calculate low - energy proton deuteron scattering in the framework of pionless effective field theory . in the quartet channel , we calculate the elastic scattering phase shift up to next - to - next - to - leading order in the power counting . in the doublet channel , we perform a next - to - leading order calcula...
1112.5070
i
let @xmath0 be a standard one - dimensional brownian motion , @xmath1 be an integer , and let @xmath2 be a symmetric element of @xmath3 . denote by @xmath4 the @xmath5-tuple wiener - it integral of @xmath2 with respect to @xmath6 . it is well known that multiple wiener - it integrals of different orders are uncorrelate...
we characterize the asymptotic independence between blocks consisting of multiple wiener - it integrals . as a consequence of this characterization , we derive the celebrated fourth moment theorem of nualart and peccati , its multidimensional extension , and other related results on the multivariate convergence of mult...
we characterize the asymptotic independence between blocks consisting of multiple wiener - it integrals . as a consequence of this characterization , we derive the celebrated fourth moment theorem of nualart and peccati , its multidimensional extension , and other related results on the multivariate convergence of mult...
1602.06556
c
we have investigated pair creation by the schwinger mechanism in @xmath7 . specifically , we considered a charged massive scalar field coupled to a constant background electric field in @xmath7 . after the canonical quantization , bogoliubov coefficients were obtained , and then the decay rate and the density of create...
we consider a charged scalar field in a-dimensional de sitter spacetime and investigate pair creation by a schwinger mechanism in a constant electric field background . using a semiclassical approximation we find that the semiclassical current of the created pairs in the strong electric field limit responds as . going...
we consider a charged scalar field in a-dimensional de sitter spacetime and investigate pair creation by a schwinger mechanism in a constant electric field background . using a semiclassical approximation the current of the created pairs has been estimated . we find that the semiclassical current of the created pairs ...
0709.4581
i
for more than two decades milgrom s modified newtonian dynamics ( mond ) mond has been able to explain galaxy rotation curves which are conventionally considered as an evidence of cold dark matter ( cdm ) on galactic scales . mond modifies newton s second law of motion to @xmath1 where @xmath2 and @xmath3 are the accel...
the spacetime splitting approach is used to derive covariant and gauge invariant perturbation equations which are valid for a general class of lagrangians . restricting attention to the parameter space of these theories we also study the implications for late - time cosmology and find that the evolution of photon and n...
we consider cosmology in the einstein - ther theory ( the generally covariant theory of gravitation coupled to a dynamical timelike lorentz - violating vector field ) with a linear - lagrangian . the spacetime splitting approach is used to derive covariant and gauge invariant perturbation equations which are valid for...
0709.4581
c
in this paper we have studied the cosmology of the einstein- ther theory . after presenting the general field equations for such theories in the cgi formalism , we focussed on a specific class of models described in eq . ( [ eq : aelagrangian ] ) , and confined ourselves to the parameter space of models described by eq...
we consider cosmology in the einstein - ther theory ( the generally covariant theory of gravitation coupled to a dynamical timelike lorentz - violating vector field ) with a linear - lagrangian . the primordial power - spectrum of scalar perturbations in this model is shown to be the same that predicted by standard ge...
we consider cosmology in the einstein - ther theory ( the generally covariant theory of gravitation coupled to a dynamical timelike lorentz - violating vector field ) with a linear - lagrangian . the spacetime splitting approach is used to derive covariant and gauge invariant perturbation equations which are valid for...
0805.4309
i
the kerr family , discovered in 1963 @xcite , comprises perhaps the most important family of exact solutions to the einstein vacuum equations @xmath18 the governing equations of general relativity . for parameter values @xmath19 ( here @xmath1 denotes the mass and @xmath0 angular momentum per unit mass ) , the kerr so...
we consider kerr spacetimes with parameters and such that , kerr - newman spacetimes with parameters , , and more generally , stationary axisymmetric black hole exterior spacetimes which are sufficiently close to a schwarzschild metric with parameter , with appropriate geometric assumptions on the plane spanned by the ...
we consider kerr spacetimes with parameters and such that , kerr - newman spacetimes with parameters , , and more generally , stationary axisymmetric black hole exterior spacetimes which are sufficiently close to a schwarzschild metric with parameter , with appropriate geometric assumptions on the plane spanned by the ...
cond-mat0210211
i
the problem of electron motion in a disordered conductor in a periodic potential and strong magnetic field displays a rich combination of phenomena of both classical and quantum origin . the complexity arises from the appearance of two independent types of periodicities , of the potential and of the cyclotron orbits , ...
we consider magnetotransport in a disordered two - dimensional electron gas in the presence of a periodic modulation in one direction . existing quasiclassical and quantum approaches to this problem account for weiss oscillations in the resistivity tensor at moderate magnetic fields , as well as a strong modulation - i...
we consider magnetotransport in a disordered two - dimensional electron gas in the presence of a periodic modulation in one direction . existing quasiclassical and quantum approaches to this problem account for weiss oscillations in the resistivity tensor at moderate magnetic fields , as well as a strong modulation - i...
1210.3841
i
let @xmath8 be an algebraically closed field and @xmath9 be integers with @xmath10 . let @xmath11 denote the affine variety in @xmath12 defined by the vanishing of all @xmath13 minors of an @xmath3 matrix whose entries are independent indeterminates over @xmath8 . equivalently , @xmath11 is the locus of @xmath3 matrice...
when , this jet scheme has two irreducible components : a trivial component , isomorphic to an affine space , and a nontrivial component that is the closure of the jets supported over the smooth locus of . this second component is referred to as the _ principal component _ of ; it is , in fact , a cone and can also be ...
we consider the affine variety of first order jets over , where is the classical determinantal variety given by the vanishing of all minors of a generic matrix . when , this jet scheme has two irreducible components : a trivial component , isomorphic to an affine space , and a nontrivial component that is the closure o...
1502.05655
i
we consider a discrete - time complex valued branching random walk . the system starts with an initial particle , called the root , at time @xmath0 . at time @xmath1 , the particle dies and gives birth to @xmath2 particles , which form the particles at generation @xmath3 . at time @xmath4 , each of these particles dies...
@addtoreset p l [ section ] [ theorem]definition [ theorem]lemma [ theorem]proposition [ theorem]remark [ theorem]corollary [ theorem]conjecture * key words or phrases : * branching random walk , complex weights , boundary case , diffusivity . * msc 2000 subject classifications : 60j80 , 60g57 , 6...
we consider the complex branching random walk on a dyadic tree with gaussian weights on the boundary between the diffuse phase and the glassy phase . we study the branching random walk in the space of continuous functions and establish convergence in this space . the main difficulty here is that the expected modulus of...
1502.05655
r
in this section , we first introduce some further notations and then give the proof of theorem [ th : main ] based on some auxiliary results , the proofs of which are postponed to the following sections in the paper . in the sequel , we will denote by @xmath103 a generic positive constant which can change from lin...
we consider the complex branching random walk on a dyadic tree with gaussian weights on the boundary between the diffuse phase and the glassy phase . we study the branching random walk in the space of continuous functions and establish convergence in this space . the main difficulty here is that the expected modulus of...
we consider the complex branching random walk on a dyadic tree with gaussian weights on the boundary between the diffuse phase and the glassy phase . we study the branching random walk in the space of continuous functions and establish convergence in this space . the main difficulty here is that the expected modulus of...
1108.4720
i
critical phenomena of partial differential equations ( pdes ) associated with the critical parameter can be found in various physical applications . for example , in @xcite the gravitational collapse of the scalar field was considered . the critical phenomenon of the gravitational collapse was discovered ; there exists...
the singular potential term yields a critical phenomenon that is , the solution behavior around the critical parameter value bifurcates into two extreme cases . pinpointing the critical value with arbitrary accuracy is even more challenging . in this work , we adopt the generalized polynomial chaos ( gpc ) method to d...
we consider the klein - gordon and sine - gordon type equations with a point - like potential , which describes the wave phenomenon in disordered media with a defect . the singular potential term yields a critical phenomenon that is , the solution behavior around the critical parameter value bifurcates into two extrem...
1108.4720
c
in this paper , we proposed an efficient method using the gpc method to find the critical parameter values and the related statistical quantities for the klein - gordon and sine - gordon equations with a point - like singular potential function . by assuming the unknown critical parameter values as a random variable , ...
we consider the klein - gordon and sine - gordon type equations with a point - like potential , which describes the wave phenomenon in disordered media with a defect . finding such critical parameter values and the associated statistical quantities demands a large number of individual simulations with different paramet...
we consider the klein - gordon and sine - gordon type equations with a point - like potential , which describes the wave phenomenon in disordered media with a defect . the singular potential term yields a critical phenomenon that is , the solution behavior around the critical parameter value bifurcates into two extrem...
1511.00031
i
the study of hadronic properties at finite temperature @xmath2 is one of the theoretical ingredients needed to understand the behaviour of matter created in relativistic heavy ion collision experiments , such as those in rhic and lhc ( alice ) . in particular , the qcd transition involving chiral symmetry restoration a...
this formulation provides a good description of scattering data in the scalar channel and generates dynamically the pole , the pole position lying within experimental determinations . previous results with this model are updated using newer analysis of pion scattering data . next , we analyze the behaviour of the pole ...
we consider the non - linear sigma model for large as an effective theory for low - energy qcd at finite temperature , in the chiral limit . at this formulation provides a good description of scattering data in the scalar channel and generates dynamically the pole , the pole position lying within experimental determina...
1511.00031
c
we have studied pion scattering in the large-@xmath1 @xmath0 model at finite temperature in the chiral limit and its consequences regarding the @xmath4 pole and chiral symmetry restoration . our analysis gives rise to interesting theoretical and phenomenological results , consistent with previous analysis and lattice d...
we consider the non - linear sigma model for large as an effective theory for low - energy qcd at finite temperature , in the chiral limit . at we calculate the pion scattering amplitude at finite and show that it satisfies exactly thermal unitarity , which had been assumed but not formally proven in previous works .
we consider the non - linear sigma model for large as an effective theory for low - energy qcd at finite temperature , in the chiral limit . at this formulation provides a good description of scattering data in the scalar channel and generates dynamically the pole , the pole position lying within experimental determina...
1504.05002
i
consider the minimization problem @xmath0 where @xmath1 is a compact polyhedral set , @xmath2 and @xmath3 is strongly convex and continuously differentiable over @xmath4 . note that for a general matrix @xmath5 , the function @xmath6 is not necessarily strongly convex . when the problem at hand is large - scale , first...
jaggi and lacoste - julien showed that the conditional gradient method with away steps employed on the aforementioned problem without the additional linear term has linear rate of convergence , depending on the so - called pyramidal width of the feasible set . this constant replaces the pyramidal width , which is diffi...
we consider the problem of minimizing a function , which is the sum of a linear function and a composition of a strongly convex function with a linear transformation , over a compact polyhedral set . jaggi and lacoste - julien showed that the conditional gradient method with away steps employed on the aforementioned pr...
1203.0447
i
let @xmath10 be a probability space and let @xmath11 be a sequence of i.i.d . random variables on @xmath10 taking values in @xmath12 , @xmath13 . let us define @xmath14 and @xmath15 . the sequence @xmath16 is called a _ random walk _ with jumps @xmath11 . the random walk @xmath16 is said to be _ recurrent _ if @xmath17...
we consider the recurrence and transience problem for a time - homogeneous markov chain on the real line with transition kernel , where the density functions , for large , have a power - law decay with exponent , where . in this paper , under a uniformity condition on the density functions and an additional mild drift ...
we consider the recurrence and transience problem for a time - homogeneous markov chain on the real line with transition kernel , where the density functions , for large , have a power - law decay with exponent , where . in this paper , under a uniformity condition on the density functions and an additional mild drift ...
1109.3336
i
the statistical analysis of functional data , commonly referred to as functional data analysis ( fda ) , is an established area of statistics with a great number of practical applications ; see the books @xcite and references therein for various examples . when the data is available as finely sampled curves , say in t...
this model includes time and frequency sampling as special cases . in contrast to classical approach in fpca in which access to entire functions is assumed , having a limited number of functional samples places limitations on the performance of statistical procedures . we study these effects by analyzing the rate of co...
we consider the sampling problem for functional pca ( fpca ) , where the simplest example is the case of taking time samples of the underlying functional components . more generally , we model the sampling operation as a continuous linear map from to , where the functional components to lie in some hilbert subspace of ...
1109.3336
i
in this section , we begin by introducing background on reproducing kernel hilbert spaces , as well as linear operators and their adjoints . we then introduce the functional and observation model that we study in this paper , and conclude with discussion of some approximation - theoretic issues that play an important r...
we consider the sampling problem for functional pca ( fpca ) , where the simplest example is the case of taking time samples of the underlying functional components . more generally , we model the sampling operation as a continuous linear map from to , where the functional components to lie in some hilbert subspace of ...
we consider the sampling problem for functional pca ( fpca ) , where the simplest example is the case of taking time samples of the underlying functional components . more generally , we model the sampling operation as a continuous linear map from to , where the functional components to lie in some hilbert subspace of ...
0906.2597
i
although the gamma - ray burst ( grb ) was discovered about 50 years ago first through its prompt @xmath1-ray emission , large uncertainties still remain in understanding the prompt emission site , namely , the distance of the emission site from the explosion centre @xmath0 , with controversial evidence . there are thr...
we constrain the distance of the gamma - ray burst ( grb ) prompt emission site from the explosion centre , , by determining the location of the electron s self absorption frequency in the grb prompt optical - to - x/-ray spectral energy distribution , assuming that the optical and the-ray emissions are among the same ...
we constrain the distance of the gamma - ray burst ( grb ) prompt emission site from the explosion centre , , by determining the location of the electron s self absorption frequency in the grb prompt optical - to - x/-ray spectral energy distribution , assuming that the optical and the-ray emissions are among the same ...
1607.03630
i
we constructed the new godunov type relativistic hydrodynamic code in milne coordinates based on the algorithm in cartesian coordinates @xcite . we evaluated the flux terms , using the numerical solution of the riemann problem with the initial condition at the constant proper time @xmath11 . we checked correctness of o...
we check the correctness of the numerical algorithm by comparing numerical calculations and analytical solutions in various problems , such as shock tubes , expansion of matter into the vacuum , landau - khalatnikov solution , propagation of fluctuations around bjorken flow and gubser flow . we investigate the energy a...
we construct a new godunov type relativistic hydrodynamics code in milne coordinates , using a riemann solver based on the two - shock approximation which is stable under existence of large shock waves . we check the correctness of the numerical algorithm by comparing numerical calculations and analytical solutions in ...
1311.6465
c
in this work , we have constructed a new kinematical variable that gives , under certain circumstances , the cm angular distribution , @xmath184 , of a decaying particle @xmath2 when one of its daughter particles @xmath7 is not detected . among the requirements for this method are that the masses of the mother particle...
this enables us to determine the spin of the mother particle and the dark matter particle in certain cases . , we give a brief summary of other methods to measure the spin of dark matter . [ sec : dylhc ] , we summarize the application of these methods to charged drell - yan production and consider the effects of a ...
we construct a new kinematical variable that is able to fully reconstruct the absolute value , and partially reconstruct the sign , of the angular distribution in the center of momentum system of a decaying particle in certain cases where the center of momentum system is only known up to a two - fold ambiguity . after ...
hep-th0210246
i
following earlier work on maximally supersymmetric solutions of eleven - dimensional supergravity @xcite , a new maximally supersymmetric solution of type iib supergravity @xcite was found . this paved the way for quantisation in light - cone gauge of superstring theory in a constant flux @xcite . the spectrum consi...
we show that these satisfy the pp - wave superalgebra at first order in string coupling . the cubic interaction vertex and dynamical supercharges presented here differ from the expressions previously given in the literature . using this vertex we compute various string theory three - point functions and comment on thei...
we construct the cubic interaction vertex and dynamically generated supercharges in light - cone superstring field theory in the pp - wave background . we show that these satisfy the pp - wave superalgebra at first order in string coupling . the cubic interaction vertex and dynamical supercharges presented here differ ...
1611.02932
i
the search for a theory of quantum gravity will only be successful if one eventually finds a way to test the candidate theories by experiment or observation @xcite . because of the extremely high energies at which quantum - gravitational effects are expected to be strong , many researchers have looked for features of q...
we continue our study on corrections from canonical quantum gravity to the power spectra of gauge - invariant inflationary scalar and tensor perturbations . a semiclassical approximation is applied in order to obtain a schrdinger equation with quantum - gravitational correction terms , from which we calculate the corre...
we continue our study on corrections from canonical quantum gravity to the power spectra of gauge - invariant inflationary scalar and tensor perturbations . a direct canonical quantization of a perturbed inflationary universe model is implemented , which leads to a wheeler - dewitt equation . for this equation , a semi...
1611.02932
c
in this paper quantum - gravitational corrections for the power spectra of the gauge - invariant scalar and tensor perturbations have been obtained in the slow - roll regime . in particular , the corrected form for the scalar and tensor power spectrum is given , respectively , by and , where @xmath144 is given in and @...
a direct canonical quantization of a perturbed inflationary universe model is implemented , which leads to a wheeler - dewitt equation . for this equation , we find that the dominant correction term from the de sitter case , which leads to an enhancement of power on the largest scales , gets modified by terms proportio...
we continue our study on corrections from canonical quantum gravity to the power spectra of gauge - invariant inflationary scalar and tensor perturbations . a direct canonical quantization of a perturbed inflationary universe model is implemented , which leads to a wheeler - dewitt equation . for this equation , a semi...
0911.0109
i
the aim of this paper is to define , analyze and possibly accustom new distributions in @xmath0 . they are defined with a help of two one - dimensional distributions that first appeared recently , partially in noncommutative context and are defined through infinite products . that is why it is difficult to analyze them...
we define and study distributions in that we callnormal . for they are really multidimensional normal , for they have densities , compact support and many properties that resemble properties of ordinary multidimensional normal distribution . we also consider some generalizations of these distributions and indicate clos...
we define and study distributions in that we callnormal . for they are really multidimensional normal , for they have densities , compact support and many properties that resemble properties of ordinary multidimensional normal distribution . we also consider some generalizations of these distributions and indicate clos...
1101.5783
i
supervised classification , also known as pattern recognition , is a fundamental problem in statistics , as it represents an abstraction of the decision - making problem faced by many applied practitioners . examples include a doctor making a medical diagnosis , a handwriting expert performing an authorship analysis , ...
we derive an asymptotic expansion for the excess risk ( regret ) of a weighted nearest - neighbour classifier . this allows us to find the asymptotically optimal vector of non - negative weights , which has a rather simple form . the improvement is greatest when , but thereafter decreases as . finally , we argue that i...
we derive an asymptotic expansion for the excess risk ( regret ) of a weighted nearest - neighbour classifier . this allows us to find the asymptotically optimal vector of non - negative weights , which has a rather simple form . we show that the ratio of the regret of this classifier to that of an unweighted-nearest n...
1301.4391
i
in this paper we focus on the a posteriori error control and adaptivity for fully discrete crank - nicolson finite element ( cnfe ) schemes for the general form of linear schrdinger equation : @xmath1 $ , } & \\ & u=0 & & \quad\mbox{on $ \partial \varomega\times ( 0,t]$ , } & \\ & u(\cdot,0)=u_0 & & \quad\mbox{in $...
the derivation of the estimators is based on a novel elliptic reconstruction that leads to estimates which reflect the physical properties of schrdinger equations . the final estimates are obtained using energy techniques and residual - type estimators . , we further develop and analyze an existing time - space adaptiv...
we derive optimal order a posteriori error estimates for fully discrete approximations of linear schrdinger - type equations , in thenorm . for the discretization in time we use the crank - nicolson method , while for the space discretization we use finite element spaces that are allowed to change in time . the derivat...
cond-mat9705307
i
the low temperature behavior of the strongly interacting quantum liquid @xmath0he has been a subject of experimental and theoretical research for decades . in 1908 helium was first liquified by kamerlingh onnes and in 1911 he discovered a sharp maximum in the density at what is now commonly called the @xmath1-point.@xc...
in particular , the usual hydrodynamics is modified in such a way that it leads to the presence of a propagating instead of a diffusive defect mode . the former is appropriate for a quantum crystal and observed in recent experiments . the observation of these additional modes is a clear experimental signature of the su...
we derive the hydrodynamic equations of motion of solid and supersolidhe , that describe the collective modes of these phases . in particular , the usual hydrodynamics is modified in such a way that it leads to the presence of a propagating instead of a diffusive defect mode . the former is appropriate for a quantum cr...
cond-mat0011028
i
glassy systems of extremely diverse types exist in nature . they all share several common features like a very slow , non - equilibrium dynamics . the development of a full theoretical description of the glassy phase is one of the most important challenges in condensed matter physics . a variety of techniques , that ra...
in particular , we argue that a crossover from a second order thermodynamic transition close to the classical critical point to a first order thermodynamic transition close to the quantum critical point is to be expected in a large class of systems . lpt - ens/0033 , lpthe/0034 .
we derive thouless - anderson - palmer ( tap ) equations for quantum disordered systems . we apply them to the study of the paramagnetic and glassy phases in the quantum version of the spherical spin - glass model . we generalize several useful quantities ( complexity , threshold level , etc . ) and various ideas ( con...
astro-ph0407367
i
now that we have become accustomed to referring to the hot gas in groups and clusters of galaxies as `` cooling flows '' , no cooling gas has been observed . although energy is lost by x - ray emission , the absence of spectral evidence for gas cooling to low temperatures has been well - documented in many observationa...
x - ray spectra indicate that little or no gas is cooling to low temperatures . this gaseous iron has been circulating for many gyrs , unable to cool . as dense inflowing this gas dominates the local x - ray spectrum but shares the total available volume with centrally heated , outflowing gas . the rapid radial recircu...
we describe a new type of dynamical model for hot gas in galaxy groups and clusters in which gas moves simultaneously in both radial directions . the observational motivations for this type of flow are compelling . x - ray spectra indicate that little or no gas is cooling to low temperatures . bubbles of hot gas typica...
astro-ph0407367
c
in this paper we describe a new model for the dynamical evolution of hot gas in groups and clusters of galaxies in which gas flows in both radial directions simultaneously . the incoming gas resembles a traditional cooling flow and dominates the x - ray emission . the outgoing gas consists of an ensemble of heated buoy...
we describe a new type of dynamical model for hot gas in galaxy groups and clusters in which gas moves simultaneously in both radial directions . furthermore , the elemental composition and total mass of gas - phase iron observed within kpc of the center can be understood as the accumulated outflow of most or all of th...
we describe a new type of dynamical model for hot gas in galaxy groups and clusters in which gas moves simultaneously in both radial directions . the observational motivations for this type of flow are compelling . x - ray spectra indicate that little or no gas is cooling to low temperatures . bubbles of hot gas typica...
1602.04685
i
in classical electrodynamics , the dynamics of @xmath0 charges and their corresponding electromagnetic fields is governed by the lorentz equations @xmath1,\end{aligned}\ ] ] the maxwell equations @xmath2 and the maxwell constraints @xmath3 for @xmath4 . in our notation , @xmath5 denote the position and momentum of the ...
we provide explicit formulas for the corresponding fields , demonstrate how this phenomenon renders the initial value problem ill - posed , and show how such bad initial data can be ruled out by extra conditions in addition to the maxwell constraints . these extra conditions , however , require knowledge of the history...
we describe a seemingly unnoticed feature of the text - book maxwell - lorentz system of classical electrodynamics which challenges its formulation in terms of an initial value problem . for point - charges , even after appropriate renormalization , we demonstrate that most of the generic initial data evolves to develo...
astro-ph9904115
i
recent discoveries of slow - moving objects beyond the orbit of neptune have radically changed our understanding of the outer solar system . these observations have revealed a large population of kuiper belt objects ( kbos ) in orbits with semi - major axes of 3945 au ( @xcite , 1995 ; @xcite ; @xcite ; @xcite ; @xcite...
the power law indices are nearly independent of the initial mass in the annulus , ; the initial eccentricity of the planetesimal swarm , ; and the initial size distribution of the planetesimal swarm . the maximum size of objects depends on their intrinsic tensile strength , ; pluto formation requires 300 erg g . our mo...
we describe new planetesimal accretion calculations in the kuiper belt that include fragmentation and velocity evolution . all models produce two power law cumulative size distributions , for radii 0.33 km and for radii 13 km . the power law indices are nearly independent of the initial mass in the annulus , ; the init...
1603.03962
c
in this paper we presented the mathematical underpinnings of the pvb ( biorthogonal von neumann ) method for quantum mechanical simulations . the pvb method exploits the phase phase space localization of the von neumann basis to provide a sparse representation of quantum mechanical states that spans only the part of ph...
we describe the mathematical underpinnings of the biorthogonal von neumann method for quantum mechanical simulations ( pvb ) . in particular , we present a detailed discussion of the important issue of non - orthogonal projection onto subspaces of biorthogonal bases , and how this differs from orthogonal projection . w...
we describe the mathematical underpinnings of the biorthogonal von neumann method for quantum mechanical simulations ( pvb ) . in particular , we present a detailed discussion of the important issue of non - orthogonal projection onto subspaces of biorthogonal bases , and how this differs from orthogonal projection . w...
1608.00465
c
we have used a general and robust method to determine the mid - infrared and optical luminosity evolutions and luminosity functions simultaneously for quasars using a sdss @xmath16 _ wise _ dataset , which combines 22 @xmath0 m infrared and @xmath25-band optical data for over 20,000 quasars ranging in redshifts from 0....
we determine the 22 m luminosity evolution and luminosity function for quasars from a data set of over 20,000 objects obtained by combining flux - limited sloan digital sky survey optical and wide field infrared survey explorer mid - infrared data . we find that the population of quasars exhibits positive luminosity ev...
we determine the 22 m luminosity evolution and luminosity function for quasars from a data set of over 20,000 objects obtained by combining flux - limited sloan digital sky survey optical and wide field infrared survey explorer mid - infrared data . we apply methods developed in previous works to access the intrinsic p...
1507.04107
i
the rapid progress in experimentally observing and even controlling electron dynamics in atoms and molecules demands powerful theoretical approaches ; see , e.g. , @xcite for reviews on this subject . one of the most challenging and , therefore , interesting tasks is the accurate description and understanding of the u...
we develop a time - dependent theory to investigate electron dynamics and photoionization processes of diatomic molecules interacting with strong laser fields including electron - electron correlation effects . we combine the recently formulated time - dependent generalized - active - space configuration interaction th...
we develop a time - dependent theory to investigate electron dynamics and photoionization processes of diatomic molecules interacting with strong laser fields including electron - electron correlation effects . we combine the recently formulated time - dependent generalized - active - space configuration interaction th...
1507.04107
c
in this paper we presented a time - dependent approach to correlated electron dynamics following the excitation of diatomic molecules with strong electromagnetic fields . the method is based on the td - gas - ci approach using a prolate - spheroidal representation of the single - particle orbitals within a partition - ...
a * 90 * , 062508 ( 2014 ) ] with a prolate spheroidal basis set including localized orbitals and continuum states to describe the bound electrons and the outgoing photoelectron . as an example the preferred orientation for ionization is determined and we find a transition from , for low intensity , to , for high inten...
we develop a time - dependent theory to investigate electron dynamics and photoionization processes of diatomic molecules interacting with strong laser fields including electron - electron correlation effects . we combine the recently formulated time - dependent generalized - active - space configuration interaction th...
nucl-th0312021
i
for over forty years now the three - nucleon problem has , with considerable success , been used as a testing ground for the nucleon - nucleon interaction . usually the three - body equations used are based on the schrdinger equation or its implementation for scattering in the form of the faddeev @xcite equations with...
we discuss effective field theory treatments of the problem of three particles interacting via short - range forces . one case of such a system is neutron - deuteron scattering at low energies . we also show that these eigenvalues can be removed from the kernel by one subtraction , resulting in an equation which is ren...
we discuss effective field theory treatments of the problem of three particles interacting via short - range forces . one case of such a system is neutron - deuteron scattering at low energies . we demonstrate that in attractive channels the renormalization - group evolution of the 1 + 2 scattering amplitude may be com...
1503.06028
i
let @xmath0 be a non - empty bounded open subset of @xmath1 for @xmath2 and let @xmath3 be the dirichlet laplacian on @xmath0 . then the spectrum @xmath4 of @xmath5 is discrete and forms a positive increasing sequence @xmath6 where the eigenvalues are repeated according to their multiplicity . interest in the geometric...
we will show examples from a class of random fractals generated from dirichlet distributions as this is a relatively simple setting in which there are sets where there will and will not be a central limit theorem . the brownian continuum random tree can also be viewed as a random fractal generated by a dirichlet distri...
we discuss the spectral asymptotics of some open subsets of the real line with random fractal boundary and of a random fractal , the continuum random tree . in the case of open subsets with random fractal boundary we establish the existence of the second order term in the asymptotics almost surely and then determine wh...
astro-ph9708231
i
the classification of an active galactic nucleus ( agn ) depends upon the wavelength at which one observes . historically , optical observations yielded the categories of seyfert types 1 and 2 , classifying most of the sources which are now `` famous '' . seyfert-2 galaxies differ from type-1 in that the former show on...
we discuss the spectral properties of a sample of type-2 seyfert galaxies based upon the analysis of data . in this paper we consider the sources for which the x - ray spectra appear to be dominated by the nuclear continuum , transmitted through a large column of absorbing material . we find that both seyfert-2 gal...
we discuss the spectral properties of a sample of type-2 seyfert galaxies based upon the analysis of data . in this paper we consider the sources for which the x - ray spectra appear to be dominated by the nuclear continuum , transmitted through a large column of absorbing material . we find that both seyfert-2 gal...
1207.3810
i
in its most general form , the dynamical state of the interior of a star is one of differential rotation and entropy stratification . if isobaric and isochoric surfaces do not coincide , the angular velocity need not be constant on cylinders . a noteable example is the sun , for which helioseismology studies have fashi...
we examine the linear behavior of three - dimensional lagrangian displacements in a stratified , shearing background . the isentropic and iso - rotation surfaces of the equilibrium flow are assumed to be axisymmetric , but otherwise fully two - dimensional . the model , in principle very general , is used to study the ...
we examine the linear behavior of three - dimensional lagrangian displacements in a stratified , shearing background . the isentropic and iso - rotation surfaces of the equilibrium flow are assumed to be axisymmetric , but otherwise fully two - dimensional . three - dimensional magnetic fields are included in the pertu...
1207.3810
c
the current work combines two very different types of calculation , linking the linear dynamics of the convective zone to the origins of solar differential rotation and vorticity . we begin with the second part first . we have argued that the centrifugal distortion of equipotential surfaces combined with demands of the...
all but high - latitude displacements align themselves with the observed surfaces of constant angular velocity . if so , many features of the sun s internal rotation become more clear , including : i ) the general appearance of the tachocline ; ii ) the extension of differential rotation well into the radiative zone ; ...
we examine the linear behavior of three - dimensional lagrangian displacements in a stratified , shearing background . the isentropic and iso - rotation surfaces of the equilibrium flow are assumed to be axisymmetric , but otherwise fully two - dimensional . three - dimensional magnetic fields are included in the pertu...
hep-ph9906487
i
in recent years solar - neutrino and atmospheric - neutrino measurements have provided a growing body of evidence for the existence of neutrino oscillations @xcite . the observed solar neutrino deficit @xcite can be interpreted as evidence for the oscillation of electron neutrinos ( @xmath8 ) into neutrinos of a diff...
we examine the physics capabilities of known flavor neutrino beams from intense muon sources . furthermore , they can test whether the dominant atmospheric neutrino oscillations are and/or , determine the content of atmospheric neutrino oscillations , and measure appearance . depending on the oscillation parameters , t...
we examine the physics capabilities of known flavor neutrino beams from intense muon sources . we find that long - baseline neutrino experiments based on such beams can provide precise measurements of neutrino oscillation mass and mixing parameters . furthermore , they can test whether the dominant atmospheric neutrino...
1101.1139
i
quantum optics is governed by rules imposed by commutation relations which have to be kept during time evolution . optical amplification is no exception to this story . typically , the amplified output is suffered from inevitable excess noise . this limitation is quantum - mechanically imposed , thus does not depend on...
we experimentally demonstrate phase - insensitive linear optical amplification which preserves the idler at the output . the amplification gain of is demonstrated . in addition , combining this amplifier with a beamsplitter , we also demonstrate approximate cloning of coherent states where an anticlone is present . we ...
we experimentally demonstrate phase - insensitive linear optical amplification which preserves the idler at the output . since our amplification operation is unitary up to small excess noise , it is reversible beyond the classical limit . the entanglement between the two output modes is the resource for the reversibili...
astro-ph0507530
i
faint blue objects discovered in deep hubble space telescope images have been the subject of discussion in recent years . the extreme depth of the hubble deep field ( hdf ) north ( williams et al . 1996 ) and south ( casertano et al . 2000 ) and the hubble ultra deep field ( hudf ; beckwith et al . 2004 ) enables us to...
we explore the nature of the faint blue objects in the hubble deep field south . we have derived proper motions for the point sources in the hubble deep field south using a 3-year baseline . combining our proper motion measurements with spectral energy distribution the other faint blue objects analyzed by mendez & minn...
we explore the nature of the faint blue objects in the hubble deep field south . we have derived proper motions for the point sources in the hubble deep field south using a 3-year baseline . combining our proper motion measurements with spectral energy distribution fitting enabled us to identify 4 quasars and 42 stars ...
astro-ph0507530
c
we identified 4 quasars and 42 stars , including 36 k0 or later type stars , with our sed fitting technique . we adopt the absolute magnitude ( @xmath54 ) for each spectral type from pickles ( 1998 ; table 2 ) . we use the @xmath54 for each object to simulate the absolute magnitudes in the wfpc2 f606w filter ( @xmath55...
fitting enabled us to identify 4 quasars and 42 stars , including 3 white dwarf candidates . two of these white dwarf candidates , hdfs 1444 and 895 , are found to display significant proper motion , 21.1 7.9 mas yr and 34.9 8.0 mas yr , and are consistent with being thick disk or halo white dwarfs located at kpc . the...
we explore the nature of the faint blue objects in the hubble deep field south . we have derived proper motions for the point sources in the hubble deep field south using a 3-year baseline . combining our proper motion measurements with spectral energy distribution fitting enabled us to identify 4 quasars and 42 stars ...
nucl-th9412030
i
the subject of this paper is the coulomb sum rule ( csr ) for inelastic electron scattering @xcite , in a reformulation which extends its validity to relativistic momentum transfers @xmath2 , where @xmath3 is the three - momentum transfer to the target nucleus , and @xmath4 is the nucleon mass . the purpose of this wo...
relativistic interactions are included by using a dirac representation adapted from a vector - scalar field theory . we consider two models for the off - shell behavior of the nuclear electromagnetic current , and demonstrate that the sum rule is accurate for applications to data over the interesting range of and three...
we extend the formulation of relativistic coulomb sum rules to account for the average effects of nuclear binding on the initial and final states of ejected nucleons . relativistic interactions are included by using a dirac representation adapted from a vector - scalar field theory . the scalar field reduces the effect...
nucl-th9412030
i
the main results of this paper can be summarized as follows : the effects of nuclear binding in the mean - field approximation enter the coulomb response function @xmath7 and the coulomb sum @xmath23 in a way that can be characterized by a reduced effective mass @xmath0 . these effects depend on the behavior of the ele...
we further indicate that the form of the sum rule is sufficiently general to accommodate a broad class of off - shell form factor models.pacs numbers : 25.30.fj , 11.55.hx , 24.10.jv @=11 @=12 0.5 true in 0.5 true in submitted to _ physical review c _
we extend the formulation of relativistic coulomb sum rules to account for the average effects of nuclear binding on the initial and final states of ejected nucleons . relativistic interactions are included by using a dirac representation adapted from a vector - scalar field theory . the scalar field reduces the effect...
1512.03705
c
we have developed a generalised langevin equation ( gle ) approach to treat non - equilibrium conditions when a central classical region is connected to two realistic thermal baths at two different temperatures . the method is called gle-2b for generalised langevin equation with two baths . following the original gle a...
b * 89 * , 134303 ( 2014 ) ] to model a central classical region connected to two realistic thermal baths at two different temperatures . in such nonequilibrium conditions a heat flow following the original gle approach , the extended langevin dynamics scheme is modified to take into account two sets of auxiliary degre...
we extend the generalised langevin equation ( gle ) method [ phys . rev . b * 89 * , 134303 ( 2014 ) ] to model a central classical region connected to two realistic thermal baths at two different temperatures . in such nonequilibrium conditions a heat flow is established , via the central system , in between the two b...
nucl-th9909010
i
we have explored whether the parameter set tm1 @xcite can be improved by adding new couplings that stem from the modern effective field theory approach to relativistic nuclear phenomenology . we have been concerned with analyzing the possibilities of the new couplings to ensure a reasonable agreement with the density d...
we extend the relativistic mean field theory model of sugahara and toki ( tm1 ) by adding new couplings suggested by modern effective field theories . an improved set of parameters ( tm1 * ) is developed with the goal to test the ability of the models based on effective field theory to describe the properties of finite...
we extend the relativistic mean field theory model of sugahara and toki ( tm1 ) by adding new couplings suggested by modern effective field theories . an improved set of parameters ( tm1 * ) is developed with the goal to test the ability of the models based on effective field theory to describe the properties of finite...
hep-lat0404014
i
recent years have witnessed steady progress in the lattice qcd calculation of the light hadron spectrum @xcite . in the quenched approximation ignoring quark vacuum polarization effects , well - controlled chiral and continuum extrapolations enabled a calculation of hadron masses with an accuracy of 0.53% @xcite . at...
we extend the study of the light hadron spectrum and the quark mass in two - flavor qcd to smaller sea quark mass , corresponding to.35 . numerical simulations are carried out using the rg - improved gauge action and the meanfield - improved clover quark action at ( fm from meson mass ) . we observe that the light had...
we extend the study of the light hadron spectrum and the quark mass in two - flavor qcd to smaller sea quark mass , corresponding to.35 . numerical simulations are carried out using the rg - improved gauge action and the meanfield - improved clover quark action at ( fm from meson mass ) . we observe that the light had...
1103.0520
i
the construction of microstate geometries for black holes and black rings is now a fairly well developed subject . the defining idea of such geometries is that they have the same asymptotics at infinity as a given black hole or black ring and yet the solutions are completely smooth and , as a consequence , they resolve...
we find a class of non - supersymmetric multi - center solutions of the stu model of five - dimensional ungauged supergravity . we show that there is an infinite number of regular multi - center solutions with non - trivial topology that are asymptotic to the near - horizon limit of a bmpv black hole . = 10000 * ...
we find a class of non - supersymmetric multi - center solutions of the stu model of five - dimensional ungauged supergravity . the solutions are determined by a system of linear equations defined on a four - dimensional khler manifold with vanishing ricci scalar and a isometry . the most general class of such khler ma...
0909.0938
i
in this paper we study the ricci flow on three - dimensional , unimodular metric lie algebras . metric lie algebras are in one - to - one correspondence with left - invariant riemannian metrics on simply - connected lie groups , and ricci flow on such metrics has been studied by a number of authors ( e.g. , @xcite @xci...
this system is amenable to direct phase plane analysis , and we find that the fixed points and special trajectories in the phase plane correspond to special metric lie algebras , including ricci solitons and special riemannian submersions . these results are one way to unify the study of ricci flow on left invariant me...
we give a global picture of the ricci flow on the space of three - dimensional , unimodular , nonabelian metric lie algebras considered up to isometry and scaling . the ricci flow is viewed as a two - dimensional dynamical system for the evolution of structure constants of the metric lie algebra with respect to an evol...
1305.6569
i
consider the stochastic dynamics @xmath0 on @xmath1 satisfying @xmath2 called _ brownian dynamics _ or _ overdamped langevin dynamics_. here @xmath3 is a smooth function , @xmath4 is a positive constant , and @xmath5 is a standard @xmath6-dimensional brownian motion @xcite . the dynamics is used to model the evolutio...
we give a mathematical framework for temperature accelerated dynamics ( tad ) , an algorithm proposed by m.r . voter in to efficiently generate metastable stochastic dynamics . using the notion of _ quasistationary distributions _ , we propose some modifications to tad . then considering the modified algorithm in an i...
we give a mathematical framework for temperature accelerated dynamics ( tad ) , an algorithm proposed by m.r . srensen and a.f . voter in to efficiently generate metastable stochastic dynamics . using the notion of _ quasistationary distributions _ , we propose some modifications to tad . then considering the modified...
astro-ph9712046
c
we have analyzed the _ asca _ and _ rosat _ pspc x - ray observations of the rich cluster abell 2029 . the _ asca _ gis and _ rosat _ pspc are in good agreement on the global x - ray spectrum , and give an average ambient gas temperature of @xmath70 kev ( including the effects of a cooling flow ) . if the gas temperatu...
we have analyzed _ asca _ and _ rosat _ pspc spectra and images of the galaxy cluster abell 2029 . the pspc image shows that the cluster is very regular and smooth . also , there is no significant evidence for any irregularities in the temperature distribution in the cluster , as would be produced by a subcluster merge...
we have analyzed _ asca _ and _ rosat _ pspc spectra and images of the galaxy cluster abell 2029 . the _ asca _ spectra of the cluster indicate that the gas temperature declines with radius . the pspc image shows that the cluster is very regular and smooth . also , there is no significant evidence for any irregularitie...
0809.1443
i
there is now overwhelming evidence that the vast majority of massive early - type galaxies harbor a supermassive black hole ( bh ) at their centers , and that bhs play an important role during the assembly and evolution of their host galaxies ( see reviews in @xcite ) . the existence of the @xmath8 correlation between ...
these x - ray sources range in luminosity from(210 kev ) = to ergs s . considering possible contamination from low - mass x - ray binaries ( lmxbs ) , we estimate that detections are possible lmxbs instead of true agns , based on the probability of observing a lmxb in a nuclear star cluster typically found in these la...
we have assembled a sample of 64 late - type spiral galaxies ( types 6.09.0 , corresponding to hubble types scd sm ) with archival _ chandra _ data . at a signal - to - noise ( s / n ) threshold of 3 , we find 12 objects with x - ray point - source detections in close proximity with the optical or near - infrared posi...
astro-ph9605112
i
the information that is available about galaxies primarily relates to their morphology , internal kinematics , and spectral energy distribution . the further away one goes , the less important become the first two , compared to the third . clearly , if one wants to study galaxy evolution , study of the electromagnetic ...
it can synthesize single age , single metallicity stellar populations or follow the galaxy through its evolution from an initial gas cloud to the present time . we have applied our model to new data for a set of three early - type galaxies , to find out whether these can be fitted using single - age old metal - rich st...
we have developed a new stellar population synthesis model designed to study early - type galaxies . it provides optical and near - infrared colors , and line indices for 25 absorption lines . it can synthesize single age , single metallicity stellar populations or follow the galaxy through its evolution from an initia...
astro-ph9605112
c
we have developed a stellar population model to apply to early - type galaxies . it produces optical and near - infrared colors , and absorption line strengths in lines from 4100 - 8800 on the lick system , is applicable to systems of intermediate or old age , and metallicity larger than 0.1 z@xmath94 . the model is...
we have developed a new stellar population synthesis model designed to study early - type galaxies . it provides optical and near - infrared colors , and line indices for 25 absorption lines . our numerical model is in good broad agreement with the analytical _ , since it offers more flexibility , and even improved ins...
we have developed a new stellar population synthesis model designed to study early - type galaxies . it provides optical and near - infrared colors , and line indices for 25 absorption lines . it can synthesize single age , single metallicity stellar populations or follow the galaxy through its evolution from an initia...
astro-ph0404256
c
we modeled the emission - line luminosity and profile from the debris released by the tidal disruption of a star by a black hole in the early phase of evolution . our model predicts prompt optical evolution of post - disruption debris and profile shapes different from circular and elliptical disk model profiles . since...
we have modeled the time - variable profiles of the h emission line from the non - axisymmetric disk and debris tail created in the tidal disruption of a solar - type star by a black hole . we model the emission line profiles in the period immediately after the accretion rate onto the black hole became significant .
we have modeled the time - variable profiles of the h emission line from the non - axisymmetric disk and debris tail created in the tidal disruption of a solar - type star by a black hole . two tidal disruption event simulations were carried out using a three dimensional relativistic smooth - particle hydrodynamic code...
1304.7780
i
we know of @xmath220 x - ray binaries with dynamically confirmed black hole ( bh ) accretors ; these include 15 low mass x - ray binaries ( lmxbs ) and 3 high mass x - ray binaries ( hmxbs ) in the milky way and magellanic clouds ( see e.g. * ? ? ? * and references within ) , as well as bh + wolf - rayet binaries in ic...
they exhibit `` hard state '' emission spectra that are seen at luminosities% eddington in x - ray binaries ( xbs ) containing a neutron star ( ns ) or black hole ( bh ) , at luminosities that significantly exceed the ns threshold . nine of these are associated with globular clusters ( gcs ) ; hence , these are most li...
we have previously identified 10 m31 black hole candidates ( bhcs ) in m31 , from their x - ray properties alone . they exhibit `` hard state '' emission spectra that are seen at luminosities% eddington in x - ray binaries ( xbs ) containing a neutron star ( ns ) or black hole ( bh ) , at luminosities that significantl...
1304.7780
i
we have identified 26 new black hole candidates in the central region of m31 , using their structure functions or luminosities to identify them as x - ray binaries , and their high luminosity hard state spectra to classify them as bhcs . of these , 12 are strong candidates , and 14 are plausible candidates that may ben...
we have previously identified 10 m31 black hole candidates ( bhcs ) in m31 , from their x - ray properties alone . we have recently discovered that analysis of the long term 0.54.5 kev variability of xbs via structure functions allows us to separate xbs from agn , even though the emission spectra are often similar ; th...
we have previously identified 10 m31 black hole candidates ( bhcs ) in m31 , from their x - ray properties alone . they exhibit `` hard state '' emission spectra that are seen at luminosities% eddington in x - ray binaries ( xbs ) containing a neutron star ( ns ) or black hole ( bh ) , at luminosities that significantl...
cond-mat9603131
i
the mechanism responsible for high @xmath1 superconductivity is still highly controversial @xcite . while a large part of the theoretical effort is based on the hypothesis that cooper pairs are formed in high @xmath1 compounds , there is no agreement on the physical origin of the pairing interaction nor on the symmetry...
pairing in the planes is due to phonons , while coulomb repulsion induces in the chains an order parameter with opposite sign . due to the anticrossing produced by hybridization between planes and chains , the order parameter changes sign on a single sheet of the fermi surface resulting in nodes in the gap . we find th...
we have studied the effect of impurities on the critical temperature for a model of ybco involving pairing both in the cuo planes and in the cuo chains . in this model pairing in the planes is due to phonons , while coulomb repulsion induces in the chains an order parameter with opposite sign . due to the anticrossing ...
cond-mat9603131
c
the conclusion of our study is that , in our model , the critical temperature is much less sensitive to impurities than it is in standard d - wave models . one basic reason is that we expect physically impurities to produce essentially plane - plane and chain - chain scattering . just as in s - wave superconductors , t...
one reason is that impurities produce essentially plane - plane and chain - chain scattering , which does not affect the critical temperature . is reduced by the scattering between parts of the fermi surface which have opposite signs for the order parameter , just as in standard d - wave . in our model this is due to ...
we have studied the effect of impurities on the critical temperature for a model of ybco involving pairing both in the cuo planes and in the cuo chains . in this model pairing in the planes is due to phonons , while coulomb repulsion induces in the chains an order parameter with opposite sign . due to the anticrossing ...
cond-mat9404061
c
the local structure of , with an orthorhombic phase and = 60 k , has been studied at the cu k@xmath142 , ba k@xmath142 , and tl l@xmath110edges using the xafs technique . several new approaches have been implemented , _ e.g. _ , direct structural simulations up to 7 using the feff5 code , constrained fits , and compari...
we have used the xafs ( x - ray - absorption fine structure ) technique to investigate the local structure about the cu , ba , and tl atoms in orthorhombic with a superconducting transition temperature = 60 k. our results clearly show that the o(1 ) , o(2 ) , cu , and ba atoms are at their ideal sites as given by the d...
we have used the xafs ( x - ray - absorption fine structure ) technique to investigate the local structure about the cu , ba , and tl atoms in orthorhombic with a superconducting transition temperature = 60 k. our results clearly show that the o(1 ) , o(2 ) , cu , and ba atoms are at their ideal sites as given by the d...
0809.2537
i
generalizations of the ising model including further than nearest - neighbor interactions may give rise to complicated spatial orderings and produce complex and rich critical behavior @xcite . the transitions between ordered and disordered phases may be continuous or of first - order with a tricritical point between t...
we implement a new and accurate numerical entropic scheme to investigate the first - order transition features of the triangular ising model with nearest - neighbor ( ) and next - nearest - neighbor ( ) antiferromagnetic interactions in ratio . our results improve the original estimates of rastelli et al . and verify a...
we implement a new and accurate numerical entropic scheme to investigate the first - order transition features of the triangular ising model with nearest - neighbor ( ) and next - nearest - neighbor ( ) antiferromagnetic interactions in ratio . important aspects of the existing theories of first - order transitions are...
0809.2537
c
the triangular ising model with nearest- and next - nearest - neighbor antiferromagnetic interactions has been studied and its first - order transition features have been clarified , when the interaction ratio is @xmath21 . we have outlined the most important aspects of the existing theories of first - order transition...
important aspects of the existing theories of first - order transitions are briefly reviewed , tested on this model , and compared with previous work on the potts model . using lattices with linear sizes and we estimate the thermal characteristics of the present weak first - order transition . however , two of our fin...
we implement a new and accurate numerical entropic scheme to investigate the first - order transition features of the triangular ising model with nearest - neighbor ( ) and next - nearest - neighbor ( ) antiferromagnetic interactions in ratio . important aspects of the existing theories of first - order transitions are...
1003.0676
c
we have studied the effects of self - annihilating dark matter on the collapse of the gas structures harboring the formation of the first stars , known as pop iii . for the first time in the literature we follow self - consistently the evolution of the dark matter profile as a consequence of the gravitational drag of t...
we include an energy term based on dark matter ( dm ) self - annihilation during the cooling and subsequent collapse of the metal - free gas , in halos hosting the formation of the first stars in the universe . we have found that the feedback induced on the chemistry of the cloud _ does _ modify the properties of the g...
we include an energy term based on dark matter ( dm ) self - annihilation during the cooling and subsequent collapse of the metal - free gas , in halos hosting the formation of the first stars in the universe . we have found that the feedback induced on the chemistry of the cloud _ does _ modify the properties of the g...
math0610735
i
we begin with a brief review of standard notation . we write @xmath4 ( respectively , @xmath5 ) to indicate that @xmath1 is a partition ( composition ) of @xmath6 , and denote by @xmath7 the number of parts of @xmath1 . the partition with @xmath8 parts equal to @xmath9 is denoted by @xmath10 $ ] . the _ cycle type _ of...
we introduce a new approach to an enumerative problem closely linked with the geometry of branched coverings ; that is , we study the number of ways a given permutation ( with cycles described by the partition ) can be decomposed into a product of exactly 2-cycles , 3-cycles , _ etc . _ , with certain minimality and tr...
we introduce a new approach to an enumerative problem closely linked with the geometry of branched coverings ; that is , we study the number of ways a given permutation ( with cycles described by the partition ) can be decomposed into a product of exactly 2-cycles , 3-cycles , _ etc . _ , with certain minimality and tr...
cond-mat0206571
c
we conclude by summarizing the strong points as well as the limitations of the new quantum impurity solver introduced in this paper , as well as possible extensions and applications . on the positive side , the dsr method provides an interpolating scheme between the weak coupling and atomic limits ( at half - fillin...
we demonstrate that this impurity solver can be applied in the context of dynamical mean - field theory , at or close to half - filling . good agreement with established results on the mott transition is found , and large values of the orbital degeneracy can be investigated at low computational cost .
we introduce a representation of electron operators as a product of a spin - carrying fermion and of a phase variable dual to the total charge ( slave quantum rotor ) . based on this representation , a new method is proposed for solving multi - orbital anderson quantum impurity models at finite interaction strength . i...