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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... |
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