article_id stringlengths 9 15 | section_id stringclasses 5
values | document stringlengths 503 67.8k | summary stringlengths 205 16.2k | abstract stringlengths 293 26.7k |
|---|---|---|---|---|
1512.06787 | i | a great success of lhc run 1 is the discovery of the 125 gev higgs boson in the standard model ( sm ) . with a higher collision energy of 13 tev , lhc run 2 is ideal for probing heavy exotic particles in new physics beyond the standard model ( bsm ) . recently , the cms and atlas collaborations have reported their ... | the recent reported 750 gev diphoton excess at the 13 tev lhc is explained in the framework of effective field theory assuming the diphoton resonance is a scalar ( pseudoscalar ) particle . it is found that the large production rate and the broad width of this resonance are hard to be simultaneously explained if only v... | the recent reported 750 gev diphoton excess at the 13 tev lhc is explained in the framework of effective field theory assuming the diphoton resonance is a scalar ( pseudoscalar ) particle . it is found that the large production rate and the broad width of this resonance are hard to be simultaneously explained if only v... |
0904.2314 | c | we have studied the relative dispersion of inertial particles in homogeneous and isotropic turbulence from two dns at resolutions @xmath2 and @xmath3 , corresponding to @xmath267 and @xmath268 , respectively . we have analysed both heavy and light particle statistics at changing the stokes numbers . we have studied the... | the relative dispersion of pairs of inertial particles in incompressible , homogeneous , and isotropic turbulence is studied by means of direct numerical simulations at two values of the taylor - scale reynolds number and , corresponding to resolutions of and grid points , respectively . these features also arise from ... | the relative dispersion of pairs of inertial particles in incompressible , homogeneous , and isotropic turbulence is studied by means of direct numerical simulations at two values of the taylor - scale reynolds number and , corresponding to resolutions of and grid points , respectively . the evolution of both heavy and... |
1411.5975 | i | clocchiatti & wheeler ( 1997 ) noted several apparent properties of stripped envelope " supernovae : ( 1 ) some events completely trap gamma rays for hundreds of days . the only known examples of these slow light curves were sn ib . ( 2 ) some events display a similar photometric evolution with an intermediate late... | the shape of the light curve peak of radioactive powered core collapse stripped previous work has shown that the principal light curve peaks for sn iib with small amounts of hydrogen and for hydrogen / helium deficient sn ib / c are often rather similar near maximum light , suggesting similar ejecta masses and k... | the shape of the light curve peak of radioactive powered core collapse stripped envelope " supernovae constrains the ejecta mass , nickel mass , and kinetic energy by the brightness and diffusion time for a given opacity and observed expansion velocity . late time light curves give constraints on the ejecta mass a... |
1411.5975 | c | this analysis defines four dilemmas associated with the late time light curves of stripped envelope supernovae . ( 1 ) the relatively similar peak properties often belie a considerable spread in the properties of the late time tail . ( 2 ) even for events with similar peaks and tails , the properties derived from th... | envelope " supernovae constrains the ejecta mass , nickel mass , and kinetic energy by the brightness and diffusion time for a given opacity and observed expansion velocity . late time light curves give constraints on the ejecta mass and energy , given the gamma ray opacity . time light curves show a wide dispersion ... | the shape of the light curve peak of radioactive powered core collapse stripped envelope " supernovae constrains the ejecta mass , nickel mass , and kinetic energy by the brightness and diffusion time for a given opacity and observed expansion velocity . late time light curves give constraints on the ejecta mass a... |
1505.02153 | i | the cosmic ray spectrum spans roughly eleven decades of energy , @xmath2 and has three major features : the steepening of the spectrum dubbed the `` knee '' at @xmath3@xmath4 @xcite , a pronounced hardening of the spectrum at @xmath5 , the so - called `` ankle '' feature @xcite , and finally a cutoff around @xmath6 ... | the sharp change in slope of the ultrahigh energy cosmic ray ( uhecr ) spectrum around ( the ankle ) , combined with evidence of a light but extragalactic component near and below the ankle and intermediate composition above , has proved exceedingly challenging to understand theoretically , without fine - tuning . we p... | the sharp change in slope of the ultrahigh energy cosmic ray ( uhecr ) spectrum around ( the ankle ) , combined with evidence of a light but extragalactic component near and below the ankle and intermediate composition above , has proved exceedingly challenging to understand theoretically , without fine - tuning . we p... |
1109.6163 | i | the spiral arrangements appear in very different systems of condense matter physics and biology @xcite providing an important example of a primitive self - organization . sometimes this self - organization results in rather intricate structures ( may be the first staircases to more complicated biological patterns ) lik... | the wave number determines both the sign and strength of _ global _ spiraling whereas _ locally _ , within a unit cell , the helical order can be strongly frustrated so that the twist angles between neighboring ferromagnetic layers may be even of different signs . conical deformations of helices caused by an arbitrary ... | the spiral magnetic order in cubic mnsi - type crystals is considered using the model of classical heisenberg ferromagnetics with an extra interaction of the dzyaloshinskii moriya ( dm ) type between neighboring atoms . for all shortest mn - mn bonds the dm vectors are expressed via the-vector for an arbitrary chosen ... |
1505.03534 | i | understanding how galaxies acquired their baryons over cosmic time is a key open question in extragalactic astronomy . how and when did galaxies of different types assemble the bulk of their stellar mass ? nearby galaxies are of particular relevance in this context : they constitute the present - day product of billion... | the spitzer survey of stellar structure in galaxies ( s g ) is a volume , magnitude , and size - limited survey of 2352 nearby galaxies with deep imaging at 3.6 and 4.5 . in this paper we also identify the physical mechanisms leading to different levels of central stellar mass concentration for galaxies with the same t... | the spitzer survey of stellar structure in galaxies ( s g ) is a volume , magnitude , and size - limited survey of 2352 nearby galaxies with deep imaging at 3.6 and 4.5 . in this paper we describe our surface photometry pipeline and showcase the associated data products that we have released to the community . we also ... |
1505.03534 | i | s@xmath0 g is the largest and most homogeneous inventory of the stellar mass and structure in the nearby universe . our 3.6@xmath1 and 4.5@xmath1 data peer through dust at the old stellar backbone of more than 2300 nearby galaxies of all morphological types in different environments . in this paper we have describe... | finally , we derive the local stellar mass - size relation at 3.6 for galaxies of different morphologies . these and other data products from our various pipelines ( science - ready mosaics , object masks , 2d image decompositions , and stellar mass maps ) , can be publicly accessed at irsa ( http://irsa.ipac.caltech.e... | the spitzer survey of stellar structure in galaxies ( s g ) is a volume , magnitude , and size - limited survey of 2352 nearby galaxies with deep imaging at 3.6 and 4.5 . in this paper we describe our surface photometry pipeline and showcase the associated data products that we have released to the community . we also ... |
1511.01184 | i | the stochastic model considered in this paper is a generalization of the stacked contact process introduced in @xcite and studied analytically in @xcite . the stacked contact process is a spatial stochastic process based on the framework of interacting particle systems that describes the co - evolution of a populatio... | the stacked contact process is a three - state spin system that describes the co - evolution of a population of hosts together with their symbionts . in a nutshell , this paper is concerned with a generalization of this system in which the symbionts may affect the fitness of the hosts by either decreasing ( pathogen ) ... | the stacked contact process is a three - state spin system that describes the co - evolution of a population of hosts together with their symbionts . in a nutshell , the hosts evolve according to a contact process while the symbionts evolve according to a contact process on the dynamic subset of the lattice occupied by... |
1007.4125 | i | cluster picture as well as mean - field picture is important to understand the structure of light nuclei @xcite . the hoyle state ( the @xmath26 state at @xmath27 mev in @xmath13c ) is a typical cluster state with the @xmath14 cluster structure @xcite , which appears by only @xmath28 mev above the @xmath14 threshold ... | the structure of and states inb is investigated with an orthogonality condition model ( ocm ) based on the gaussian expansion method . it is shown that the state located around theli+ threshold has an cluster structure , whereas the and states have a shell - model - like compact structure . the state just below theli+ ... | the structure of and states inb is investigated with an orthogonality condition model ( ocm ) based on the gaussian expansion method . full levels up to the and states around the threshold (=11.1 mev ) are reproduced consistently with the experimental energy levels . it is shown that the state located around theli+ thr... |
1007.4125 | r | the energy levels of @xmath0 and @xmath57 states in @xmath2b with respect to the @xmath3 threshold are shown in fig . [ fig:2 ] , which are obtained with the @xmath3 ocm using gem . in the present calculation , we found that three @xmath56 states and two @xmath57 states come out as either bound states against particle ... | we found that the state does not possess an-condensate - like nature similar to the state ofc ( hoyle state ) which has a dilute-condensate structure described by a configuration with about% probability , although the monopole transition strength of the former is as large as that of the latter . we discuss the reasons ... | the structure of and states inb is investigated with an orthogonality condition model ( ocm ) based on the gaussian expansion method . full levels up to the and states around the threshold (=11.1 mev ) are reproduced consistently with the experimental energy levels . it is shown that the state located around theli+ thr... |
1301.0540 | i | young nuclear star clusters have now been found surrounding supermassive black holes in a number of nearby galaxies ( e.g. * ? ? ? * ; * ? ? ? * ; * ? ? ? the best studied young nuclear cluster is at the center of our own milky way galaxy , located only 8 kpc away and surrounding a supermassive black hole ( smbh ) of m... | the supermassive black hole at the center of the milky way plays host to a massive , young cluster that may have formed in one of the most inhospitable environments in the galaxy . we present new measurements of the global properties of this cluster , including the initial mass function ( imf ) , age , and cluster mass... | the supermassive black hole at the center of the milky way plays host to a massive , young cluster that may have formed in one of the most inhospitable environments in the galaxy . we present new measurements of the global properties of this cluster , including the initial mass function ( imf ) , age , and cluster mass... |
1301.0540 | c | the young nuclear star cluster at the galactic center , at least along the plane of the well - defined clockwise disk , has an imf slope in the range @xmath124 ( 68% confidence interval ) for stellar masses above @xmath410 m@xmath2 . this is significantly flatter than clusters in the milky way disk and field ( @xmath12... | the new imf slope measurement is now consistent with x - ray observations indicating a factor of 10 fewer x - ray emitting pre - main - sequence stars than expected when compared with a salpeter imf . the young cluster at the galactic center is one of the few definitive examples of an imf that deviates significantly fr... | the supermassive black hole at the center of the milky way plays host to a massive , young cluster that may have formed in one of the most inhospitable environments in the galaxy . we present new measurements of the global properties of this cluster , including the initial mass function ( imf ) , age , and cluster mass... |
1003.3195 | i | much of classical and quantum information theory is concerned with the use of one resource ( a channel , an entangled state , etc . ) to simulate another . typically errors are allowed in the simulation protocol if they vanish asymptotically as the number of resources involved grows . one then asks for the asymptotic r... | are exhibited for finite block lengths . the most striking result here is that entanglement can assist in zero - error communication . in the large block length limit , shared randomness is shown to be just as powerful as arbitrary non - signalling correlations for exact simulation , but not for asymptotic zero - error... | the theory of zero - error communication is re - examined in the broader setting of using one classical channel to simulate another exactly in the presence of various classes of non - signalling correlations between sender and receiver i.e. shared randomness , shared entanglement and arbitrary non - signalling correlat... |
1011.2175 | i | higher dimensional lorentzian spacetimes are of considerable interest in current theoretical physics . lorentzian spacetimes for which all polynomial scalar invariants constructed from the riemann tensor and its covariant derivatives are constant are called @xmath0 spacetimes @xcite . all curvature invariants of all or... | the weyl tensor and the ricci tensor can be algebraically classified in a lorentzian spacetime of arbitrary dimensions using alignment theory . used in tandem with the boost weight decomposition and curvature operators , the algebraic classification of the weyl tensor and the ricci tensor in higher dimensions can then ... | the weyl tensor and the ricci tensor can be algebraically classified in a lorentzian spacetime of arbitrary dimensions using alignment theory . used in tandem with the boost weight decomposition and curvature operators , the algebraic classification of the weyl tensor and the ricci tensor in higher dimensions can then ... |
1011.2175 | c | for a curvature tensor of a particular algebraic type , the associated operator will have a restricted eigenvector structure . for a given curvature operator in arbitrary dimensions , we can thus consider the eigenvalues of this operator to obtain necessary conditions in order for the tensor to be of a particular algeb... | in particular , for a tensor of a particular algebraic type , the associated operator will have a restricted eigenvector structure , and this can then be used to determine necessary conditions for a particular algebraic type . in principle , this analysis can be used to study all of the various algebraic types ( and th... | the weyl tensor and the ricci tensor can be algebraically classified in a lorentzian spacetime of arbitrary dimensions using alignment theory . used in tandem with the boost weight decomposition and curvature operators , the algebraic classification of the weyl tensor and the ricci tensor in higher dimensions can then ... |
0901.2587 | i | the large - scale structure of the universe is one of the pillars of our modern understanding of cosmology , encoding information about the contents and evolution of the universe , the physics of the growth of density fluctuations with time , and the formation and evolution of galaxies within the underlying network of ... | the main scientific goal of the survey is the measurement of baryon acoustic oscillations ( bao ) in the galaxy clustering pattern at a significantly higher redshift than previous studies . the bao may be applied as a standard cosmological ruler to constrain dark energy models . surveys , cosmology : observations , lar... | the wigglez dark energy survey is a large - scale structure survey of intermediate - redshift uv - selected emission - line galaxies scheduled to cover 1000 deg , spanning a broad redshift range . the main scientific goal of the survey is the measurement of baryon acoustic oscillations ( bao ) in the galaxy clustering ... |
0901.2587 | c | we have measured the small - scale clustering amplitude of high - redshift bright emission - line galaxies using the first @xmath2 of spectra from the aat wigglez dark energy survey ( @xmath309 galaxies in the redshift range @xmath150 ) . we have successfully developed a methodology to generate random realizations of t... | based on the first of the dataset , we present initial results concerning the small - scale clustering of the wigglez targets , together with survey forecasts . the wigglez galaxy population possesses a clustering length mpc , which is significantly larger than uv - selected samples , with a slope . this clustering len... | the wigglez dark energy survey is a large - scale structure survey of intermediate - redshift uv - selected emission - line galaxies scheduled to cover 1000 deg , spanning a broad redshift range . the main scientific goal of the survey is the measurement of baryon acoustic oscillations ( bao ) in the galaxy clustering ... |
1601.01989 | i | although interstellar dust grains represent only a small fraction ( @xmath6 ) of the total mass in molecular clouds , they are important sites for the production of molecular hydrogen ( h@xmath7 ) and other complex molecules . these molecules play a role in the formation and the chemistry of pre - stellar cores @xcite ... | thermal emission from cold dust grains in giant molecular clouds can be used to probe the physical properties , such as density , temperature and emissivity in star - forming regions . previous studies showed that molecular emission lines can contribute significantly to the measured fluxes in those continuum bands . [ ... | thermal emission from cold dust grains in giant molecular clouds can be used to probe the physical properties , such as density , temperature and emissivity in star - forming regions . we present the scuba-2 shared - risk observations at 450 m and 850 m of the orion a molecular cloud complex taken at the james clerk ma... |
1601.01989 | c | quantifying the molecular line contamination in submillimetre observations , such as in scuba-2 850 @xmath0 m maps , is a necessary step in the study of cold interstellar dust . through the construction of accurate spectral energy distributions , it is possible to learn much about the physical properties of this import... | we have obtained a new spectral index map for the thermal emission of dust in the well - known integral - shaped filament . this allows us to quantify the effect of line contamination on the ratio of 850 m to 450 m flux densities and how it modifies the deduced spectral index of emissivity for the dust grains . | thermal emission from cold dust grains in giant molecular clouds can be used to probe the physical properties , such as density , temperature and emissivity in star - forming regions . we present the scuba-2 shared - risk observations at 450 m and 850 m of the orion a molecular cloud complex taken at the james clerk ma... |
astro-ph9607156 | m | our code integrates the equations of motion for a set of gravitating particles . these equations can be derived from the lagrangian @xmath7 here the indices @xmath8 and @xmath9 span the set of particles in the system , @xmath10 is the mass of particle @xmath8 , @xmath11 its position at time @xmath12 , and @xmath13 desc... | the code integrates the equations of motion of a set of particles subject to their mutual gravitational interaction and to an optional , arbitrary external field . the interactions between particles are computed using a hierarchy of nested grids constructed anew at each integration step to enhance the spatial resolutio... | this article describes a new , fully adaptive particle - multiple - mesh ( pm ) numerical simulation code developed primarily for cosmological applications . the code integrates the equations of motion of a set of particles subject to their mutual gravitational interaction and to an optional , arbitrary external field ... |
0711.2031 | i | the main goal of the article is to improve description of neutrino scattering off argon in the 1-gev energy region . we have presented the way to calculate approximate spectral functions of medium nuclei and applied it to electron scattering off oxygen , calcium , and argon targets . for neutrino interactions precise e... | this article is aimed at improving the description of lepton - nucleus interactions in the sub - gev energy range . discrepancy between the presented model and the systematic computations available for oxygen [ o. benhar _ et al . _ , phys . rev . d * 72 * , 053005 ( 2005 ) ] is also found to be very small . | this article is aimed at improving the description of lepton - nucleus interactions in the sub - gev energy range . approximate spectral functions for oxygen , calcium , and argon are constructed and used to obtain the electron cross sections in a given scattering angle . comparison with a sample of available experim... |
1507.01530 | i | recent advances on information technologies facilitate real - time message exchanges and decision - making among geographically dispersed strategic entities . this has boosted the emergence of new generation of networked systems ; e.g. , the smart grid and intelligent transportation systems . these networked systems sh... | this paper considers a class of generalized convex games where each player is associated with a convex objective function , a convex inequality constraint and a convex constraint set . the particular challenge we consider is that the component functions are unknown _ a priori _ to associated players . we study two dist... | this paper considers a class of generalized convex games where each player is associated with a convex objective function , a convex inequality constraint and a convex constraint set . the players aim to compute a nash equilibrium through communicating with neighboring players . the particular challenge we consider is ... |
1209.4019 | i | hidden markov models have proven their usefulness across a wide variety of applications . in many of these applications , the user or the experimenter will have some way of influencing the transitions of the underlying markov chain , as in markov decision processes , and such a process is called a partially observed ma... | this paper deals with the question of how to most effectively conduct experiments in partially observed markov decision processes so as to provide data that is most informative about a parameter of interest . methods from markov decision processes , especially dynamic programming , are introduced and then used in an al... | this paper deals with the question of how to most effectively conduct experiments in partially observed markov decision processes so as to provide data that is most informative about a parameter of interest . methods from markov decision processes , especially dynamic programming , are introduced and then used in an al... |
0901.1634 | i | why each particular star reaches a certain level of activity , and why seemingly similar stars may have drastically different chromospheres ? it is believed that differential rotation and convection are the key factors responsible for the magnetic activity in the star . a significant fraction of stellar population , es... | the goal of the study is to determine radial velocities and fundamental stellar parameters in chromospherically active binary systems in order to include them in the activity - rotation and activity - age relations . the double - line spectral binarity was confirmed and the orbital solutions improved for both systems .... | this paper describes a multiwavelengh optical study of chromospheres in two x - ray / euv selected active binary stars with strong h emission , and . the goal of the study is to determine radial velocities and fundamental stellar parameters in chromospherically active binary systems in order to include them in the acti... |
astro-ph0010199 | i | in this paper , we discuss the results of a range of experiments performed with a 1-dimensional hydrocode to determine the characteristics of vertical oscillations of the interstellar medium . we were interested in the dynamics of the ism in the direction normal to the plane of the galaxy ( i.e. the vertical direction ... | this paper describes some interesting properties of waves in , and oscillations of , the interstellar medium in the direction normal to the plane of the galaxy . we discovered that three of the four observed phenomena targeted are likely to be closely connected . following a large expansion , this can result in the pro... | this paper describes some interesting properties of waves in , and oscillations of , the interstellar medium in the direction normal to the plane of the galaxy . our purpose is to examine possible reasons for four observed phenomena : the falling sky in the northern hemisphere ; the apparent presence of clouds in absor... |
astro-ph0010199 | c | we found several potentially important properties of the interstellar medium in our experiments . probably the most intriguing of these is that segregation of infalling material into two dominant components occurs naturally after any large expansive event in the ism as a whole . the material closest to the midplane ret... | our findings included : 1 ) the anticipated growth in amplitude of high frequency waves with height ; 2 ) the four lowest normal modes for the oscillation of the atmosphere as a whole , as functions of the height of the outer boundary ; 3 ) the time for material to ` bounce ' from one unusually dense state to the next ... | this paper describes some interesting properties of waves in , and oscillations of , the interstellar medium in the direction normal to the plane of the galaxy . our purpose is to examine possible reasons for four observed phenomena : the falling sky in the northern hemisphere ; the apparent presence of clouds in absor... |
1108.1716 | i | [ section - introduction ] recent improvements in multidisciplinary methods and , particularly , the availability of powerful computational tools are giving researchers an ever greater opportunity to investigate societies in their complex nature . the adoption of a complex systems approach allows the modeling of mac... | , we show how the corresponding macro description is obtained by a projection construction . then , well known conditions for lumpability make it possible to establish the cases where the macro model is still markov . in this case in addition , we show how restrictions in communication leading to the co existence of d... | this paper introduces a markov chain approach that allows a rigorous analysis of agent based opinion dynamics as well as other related agent based models ( abm ) . by viewing the abm dynamics as a micro description of the process , we show how the corresponding macro description is obtained by a projection construction... |
astro-ph0306324 | i | with massive new data sets shrinking the statistical error bars on cosmological quantities , it is becoming increasingly important to avoid inaccuracies in their modeling and analysis . for example , one of the less interesting aspects of modern studies of large scale structure is having to deal with complex angular ma... | the scheme includes facilities to compute the spherical harmonics of the angular mask , and data - random and random - random angular integrals . a software package mangle which implements this scheme , along with complete software documentation , is available at http://casa.colorado.edu/~ajsh / mangle/. large - sc... | this paper presents a scheme to deal accurately and efficiently with complex angular masks , such as occur typically in galaxy surveys . an angular mask is taken to be an arbitrary union of arbitrarily weighted angular regions bounded by arbitrary numbers of edges . the restrictions on the mask are ( i ) that each edge... |
astro-ph0310440 | i | understanding the origin and nature of galaxy scaling relations is a fundamental quest of any successful theory of galaxy formation . the success of a particular theory will be judged by its ability to predict the slope , scatter , and zero - point of any robust galaxy scaling relation at any particular wavelength . so... | this paper presents an exploration of two fundamental scaling relations of spiral galaxies , the luminosity - rotation speed ( or tully - fisher ; tf ) relation , and the size - luminosity ( sl ) relation , and the dependences of their scatter , at red and infrared bands . the collected surveys provide accurate-band lu... | this paper presents an exploration of two fundamental scaling relations of spiral galaxies , the luminosity - rotation speed ( or tully - fisher ; tf ) relation , and the size - luminosity ( sl ) relation , and the dependences of their scatter , at red and infrared bands . we verify that the observed virial relations o... |
1605.05910 | i | there has long been an interest in time series motions on the complex plane : the rotary analysis method decomposes such motions into counter - rotating components which have proved particularly useful in the study of geophysical flows influenced by the rotation of the earth @xcite . let a complex - valued @xmath3-vect... | this paper proposes a frequency domain approach to test the hypothesis that a complex - valued vector time series is proper , i.e. , for testing whether the vector time series is uncorrelated with its complex conjugate . if the hypothesis is rejected , frequency bands causing the rejection will be identified and might ... | this paper proposes a frequency domain approach to test the hypothesis that a complex - valued vector time series is proper , i.e. , for testing whether the vector time series is uncorrelated with its complex conjugate . if the hypothesis is rejected , frequency bands causing the rejection will be identified and might ... |
1209.6155 | i | this paper has examined the hypothesis that the great eruption of @xmath6 carinae was powered by csm interaction , where ejecta kinetic energy is converted to visual - wavelength luminosity in a radiative shock passing through dense csm . by invoking an explosion of almost 10@xmath4 ergs occuring in 1843 that expands i... | the emergent luminosity is powered by converting kinetic energy to radiation through csm interaction , analogous to the process occurring in more luminous type iin supernovae , except with times lower explosion energy and at slower speeds ( causing a longer duration and lower emergent luminosity ) . we demonstrate that... | this paper proposes a simple model for the 19th century eruption of eta carinae that consists of two components : ( 1 ) a strong wind ( yr ;=200 km s ) , blowing for 30 years , followed by ( 2 ) a erg explosion ( 10 ; 750 - 1000 km s ) occuring in 1844 . the ensuing collision between the fast ejecta and the dense circu... |
1604.06218 | i | this is the fifth paper of the series reporting the ongoing large campaign of monitoring super - eddington accreting massive black holes ( seambhs ) in active galaxies and quasars starting from october 2012 . one of the major goals of the campaign is to search for massive black holes with extreme accretion rates throug... | this paper reports results of the third - year campaign of monitoring super - eddington accreting massive black holes ( seambhs ) in active galactic nuclei ( agns ) between . , we find that the reduction of h lags tightly depends on accretion rates , , where is the h lag from the normal relation . | this paper reports results of the third - year campaign of monitoring super - eddington accreting massive black holes ( seambhs ) in active galactic nuclei ( agns ) between . ten new targets were selected from quasar sample of sloan digital sky survey ( sdss ) , which are generally more luminous than the seambh candida... |
1604.06218 | c | we present the results of the third year of reverberation mapping of super - eddington accreting massive black holes ( seambhs ) . h@xmath1 lags of five new seambhs have been detected . similar to the seambh2012 and seambh2013 samples , we find that the seambh2014 objects generally have shorter h@xmath1 lags than the n... | we find that the lags are generally shorter , by large factors , than those of objects with same optical luminosity , in light of the well - known relation . fitting 63 mapped agns , we present a new scaling relation for the broad - line region : $ ] , where is 5100 continuum luminosity , and coefficients oflt - d , ,... | this paper reports results of the third - year campaign of monitoring super - eddington accreting massive black holes ( seambhs ) in active galactic nuclei ( agns ) between . ten new targets were selected from quasar sample of sloan digital sky survey ( sdss ) , which are generally more luminous than the seambh candida... |
1608.00694 | r | photoionization models of ngc 3242 were computed in order to constrain the central star temperature and luminosity using cloudy version 13.03 @xcite . during the computational process , cloudy steps outward from the center of the nebula , solving the energy balance and ionization balance equations simultaneously at eve... | the three profiles tested were a constant density profile , a gaussian density profile , and a gaussian with a power law density profile . the temperature and luminosity were not affected significantly by the choice of density structure . the values for the stellar temperature and luminosity from our best fit model are... | this project sought to consider two important aspects of the planetary nebula ngc 3242 using new long - slit hst / stis spectra . first , we investigated whether this object is chemically homogeneous by dividing the slit into different regions spatially and calculating the abundances of each region . the major result i... |
1608.00694 | i | in this work , we began by looking for variations in the nebular properties of ngc 3242 . this was accomplished by first dividing the co - spatial spectrophotometric measurements obtained during the hst cycle 19 program go 12600 into ten spatial regions , one full region and nine subsets of the full region . the spectr... | first , we investigated whether this object is chemically homogeneous by dividing the slit into different regions spatially and calculating the abundances of each region . the major result is that the elements of he , c , o , and ne are chemically homogeneous within uncertainties across the regions probed , implying th... | this project sought to consider two important aspects of the planetary nebula ngc 3242 using new long - slit hst / stis spectra . first , we investigated whether this object is chemically homogeneous by dividing the slit into different regions spatially and calculating the abundances of each region . the major result i... |
physics0508090 | i | the field of cold molecules is rapidly developing , since many research groups are working at the production of dense samples of cold ( @xmath11 k ) or ultracold ( @xmath2 100 @xmath3k ) molecules @xcite . moreover , the field of molecular condensates has opened recently , with experimental evidence for molecules forme... | this theoretical paper investigates the formation of ground state molecules from ultracold cesium atoms in a two - color scheme . following previous work on photoassociation with chirped picosecond pulses [ luc - koenig et al . the use of chirped pulses makes the two - color scheme robust , simple and efficient . | this theoretical paper investigates the formation of ground state molecules from ultracold cesium atoms in a two - color scheme . following previous work on photoassociation with chirped picosecond pulses [ luc - koenig et al . , phys . rev . a * 70 * , 033414 ( 2004 ) ] , we investigate stabilization by a second ( dum... |
1409.3140 | i | the experiments on the interaction of femtosecond lasers with matter are widespread nowadays @xcite . during the ultrafast heating the matter passes through the two - temperature state with hot electrons and relatively cold ions . different approaches may be used to simulate these experiments . two - temperature hydrod... | this work is devoted to the investigation of transport and optical properties of liquid aluminum in the two - temperature case . at first optical properties , static electrical and thermal conductivities were obtained in the _ ab initio _ calculation . the _ ab initio _ calculation is based on the quantum molecular dyn... | this work is devoted to the investigation of transport and optical properties of liquid aluminum in the two - temperature case . at first optical properties , static electrical and thermal conductivities were obtained in the _ ab initio _ calculation . the _ ab initio _ calculation is based on the quantum molecular dyn... |
1409.3140 | r | [ subsec : results : abinitio ] the calculations were performed for aluminum at normal density . the temperatures of electrons and ions were in the range from 3 kk up to 50 kk . three basic types of the calculations were performed : 1 ) the equilibrium case with @xmath61 varied from 3 kk up to 20 kk ; 2 ) at fix... | the semiempirical approximation was constructed based on the results of the _ ab initio _ caculation . the approximation yields the dependences and for the static electrical conductivity and thermal conductivity , respectively . we have compared our results with a number of other models . our results are not consistent... | this work is devoted to the investigation of transport and optical properties of liquid aluminum in the two - temperature case . at first optical properties , static electrical and thermal conductivities were obtained in the _ ab initio _ calculation . the _ ab initio _ calculation is based on the quantum molecular dyn... |
1409.3140 | c | 1 . we have performed _ ab initio _ calculations of optical properties , static electrical and thermal conductivities of liquid aluminum in the two - temperature regime . 2 . based on the results of _ ab initio _ calculations we have built the semiempirical approximation of static electrical and thermal conductivit... | the approximation is valid for liquid aluminum at g/ , 3 kk kk . our results are well described by the drude model with the effective relaxation time . they are all reduced in the low - temperature limit to the drude model with different expressions for the relaxation time . | this work is devoted to the investigation of transport and optical properties of liquid aluminum in the two - temperature case . at first optical properties , static electrical and thermal conductivities were obtained in the _ ab initio _ calculation . the _ ab initio _ calculation is based on the quantum molecular dyn... |
0901.3966 | i | observations of the @xcite trough in the spectra of intermediate redshift quasars , coupled with large fluctuations in the mean transmission of the forest , provide the most direct evidence for the tail - end of reionisation occurring around @xmath5 ( @xcite ) . however , to date only a handful of ultraviolet ( uv ) qu... | three independent observational studies have now detected a narrow ( ) dip centred at in the otherwise smooth redshift evolution of the forest effective optical depth . this feature has previously been interpreted as an indirect signature of rapid photo - heating in the igm during the epoch of reionisation . | three independent observational studies have now detected a narrow ( ) dip centred at in the otherwise smooth redshift evolution of the forest effective optical depth . this feature has previously been interpreted as an indirect signature of rapid photo - heating in the igm during the epoch of reionisation . we examine... |
0901.3966 | c | we have used a semi - analytic model of inhomogeneous reionisation and high resolution hydrodynamical simulations of the forest to investigate the impact of sudden reheating on the evolution of the forest effective optical depth . our semi - analytic model indicates that any injection of energy into the igm during inho... | we examine this interpretation using a semi - analytic model of inhomogeneous reionisation and high resolution hydrodynamical simulations of the forest . we instead find that a rapid ( ) boost to the igm temperature ( ) beginning at produces a well understood and generic evolution in the effective optical depth , where... | three independent observational studies have now detected a narrow ( ) dip centred at in the otherwise smooth redshift evolution of the forest effective optical depth . this feature has previously been interpreted as an indirect signature of rapid photo - heating in the igm during the epoch of reionisation . we examine... |
astro-ph0010011 | i | at least 11 of the nearly 5 dozen known am her variables are true eclipsing binaries where light curves through eclipse can be used to analyze the structure and relative importance of emission regions on the magnetic white dwarf and in the accretion column that connects it to the mass - losing companion . the eclipsing... | separation of the eclipse light curves into specific wavebands allows the multiple emission components to be distinguished . is detected in the optical / near - uv and found to occupy no more than of the stellar surface . the eclipse light curves vary enormously from epoch to epoch and as a function of waveband . | time - resolved , multi - epoch , _ hubble space telescope _ ultraviolet eclipse spectrophotometry is presented for the magnetic cataclysmic variables ( mcvs ) v1309 ori , mn hya , v2301 oph , and v1432 aql . separation of the eclipse light curves into specific wavebands allows the multiple emission components to b... |
astro-ph0010011 | r | light curves were prepared from the time - resolved uv spectroscopy in 4 wavelength bandpasses in a manner similar to the procedure described in papers i and ii . the wavebands extracted from the dispersed spectrum are : a near - uv interval ( nuv ; @xmath29 ) ; the far - uv continuum ( fuv ; @xmath30 excluding @xmath... | ultraviolet eclipse spectrophotometry is presented for the magnetic cataclysmic variables ( mcvs ) v1309 ori , mn hya , v2301 oph , and v1432 aql . the uv emission - line spectrum of v1309 ori ( and to a lesser extent , mn hya ) is unusual among mcvs , with the relative strength of in v1309 orimatched only by t... | time - resolved , multi - epoch , _ hubble space telescope _ ultraviolet eclipse spectrophotometry is presented for the magnetic cataclysmic variables ( mcvs ) v1309 ori , mn hya , v2301 oph , and v1432 aql . separation of the eclipse light curves into specific wavebands allows the multiple emission components to b... |
astro-ph0010011 | c | time - resolved _ hst _ uv spectroscopy of four eclipsing mcvs has enabled us to identify : * accretion - heated photospheric spots in v1309 ori and v2301 oph with covering factors @xmath0 and @xmath10.008 , and blackbody temperatures @xmath2 k and @xmath190,000 k , respectively . * a cyclotron shock on mn hy... | accretion - heated photospheric spots are detected in v1309 ori and v2301 oph , indicating covering factors and.008 , and blackbody temperatures k and,000 k , respectively . the cyclotron - emitting shock on mn hya emission from the accretion stream is a prominent component in v1309 ori and v2301 oph , and th... | time - resolved , multi - epoch , _ hubble space telescope _ ultraviolet eclipse spectrophotometry is presented for the magnetic cataclysmic variables ( mcvs ) v1309 ori , mn hya , v2301 oph , and v1432 aql . separation of the eclipse light curves into specific wavebands allows the multiple emission components to b... |
astro-ph0512428 | c | optical spectra were measured for 19 nebulae in ngc 6822 at galactocentric radii between 0.05 kpc and 2 kpc , or out to about four exponential scale lengths . [ ] @xmath24363 was detected in five regions , and subsequent direct oxygen abundances were derived . oxygen abundances for the remaining regions were derive... | the extent of the measured nebulae spans galactocentric radii in the range between 0.05 kpc and 2 kpc ( over four exponential scale lengths ) . in five regions ( hubble i , hubble v , k , k , kd 28e ) , the temperature - sensitive [ ] emission line was detected , and direct oxygen abundances were derived . oxygen ... | to test the existence of a possible radial gradient in oxygen abundances within the local group dwarf irregular galaxy ngc 6822 , we have obtained optical spectra of 19 nebulae with the efosc2 spectrograph on the 3.6-m telescope at eso la silla . the extent of the measured nebulae spans galactocentric radii in the ran... |
cond-mat0510066 | i | the prospect of using molecules as the fundamental building blocks of future nanoelectronics devices is rather innovating and exciting from the point of view of potential applications . on the fundamental side , the field of molecular electronics also opens new directions for research because of the prominent role of p... | this theoretical work is motivated by a recent experiment by leroy et al . using a carbon nanotube contacted by an stm tip [ nature * 432 * , 371 ( 2004 ) ] , where negative differential conductance of the breathing mode phonon side peaks could be observed . a quantum dot model is used , coupling a single electronic le... | transport through a single molecular conductor is considered , showing negative differential conductance behavior associated with phonon - mediated electron tunneling processes . this theoretical work is motivated by a recent experiment by leroy et al . using a carbon nanotube contacted by an stm tip [ nature * 432 * ,... |
0807.0022 | i | generalization of some well - known stochastic processes indexed by a single parameter to processes indexed by two parameters has attracted considerable interest recently . for example , houdre and villa @xcite generalized fractional brownian motion parametrized by a single hurst index to the bifractional brownian moti... | two types of gaussian processes , namely the gaussian field with generalized cauchy covariance ( gfgcc ) and the gaussian sheet with generalized cauchy covariance ( gsgcc ) are considered . the associated self - similar random fields obtained by applying the lamperti transformation to gfgcc and gsgcc are studied . | two types of gaussian processes , namely the gaussian field with generalized cauchy covariance ( gfgcc ) and the gaussian sheet with generalized cauchy covariance ( gsgcc ) are considered . some of the basic properties and the asymptotic properties of the spectral densities of these random fields are studied . the asso... |
0807.0022 | c | we have studied some of the basic properties of gfgcc and gsgcc , and their associated lamperti transforms . the asymptotic properties of the spectral densities of gfgcc and gsgcc are considered . one expects the separate characterization of fractal dimension and long range dependence for gfgcc and gsgcc will provide m... | faculty of engineering , multimedia university , jalan multimedia , cyberjaya , 63100 , selangor darul ehsan , malaysia . faculty of information technology , multimedia university , jalan multimedia , cyberjaya , 63100 , selangor darul ehsan , malaysia . | two types of gaussian processes , namely the gaussian field with generalized cauchy covariance ( gfgcc ) and the gaussian sheet with generalized cauchy covariance ( gsgcc ) are considered . some of the basic properties and the asymptotic properties of the spectral densities of these random fields are studied . the asso... |
astro-ph9712055 | c | we begin by summarizing the results of the various tests presented in this paper . the direct comparison of pl relations for the inner and outer cepheid fields in m101 imply a difference in inferred true distance moduli of 0.16 @xmath0 0.10 mag ( inner field closer ) , over an abundance baseline of 0.68 @xmath0 0.15 de... | uncertainty in the metal abundance dependence of the cepheid variable period - luminosity ( pl ) relation remains one of the outstanding sources of systematic error in the extragalactic distance scale and the hubble constant . to test for such a metallicity dependence , we have used the wide field planetary camera 2 ( ... | uncertainty in the metal abundance dependence of the cepheid variable period - luminosity ( pl ) relation remains one of the outstanding sources of systematic error in the extragalactic distance scale and the hubble constant . to test for such a metallicity dependence , we have used the wide field planetary camera 2 ( ... |
1205.4694 | c | in this paper , we have analysed hydrodynamical simulations with an extensive treatment of the physics of baryons in order to study the evolution of the distribution of baryons in a local group - type object . in particular , we have investigated the impact of i ) supernova feedback , ii ) more powerful sources of feed... | using hydrodynamical zoom simulations in the standardcdm cosmology , we investigate the evolution of the distribution of baryons ( gas and stars ) in a local group - type universe . + first , with standard star formation and supernova feedback prescriptions , we find that the mean baryonic fraction value estimated at t... | using hydrodynamical zoom simulations in the standardcdm cosmology , we investigate the evolution of the distribution of baryons ( gas and stars ) in a local group - type universe . + first , with standard star formation and supernova feedback prescriptions , we find that the mean baryonic fraction value estimated at t... |
astro-ph0609016 | i | over the last decade , a large number of studies have measured the evolution of cosmic star formation rate ( sfr ) in the range @xmath18 , using different diagnostics ( steidel et al . 1995 ; madau et al . 1996 ; chary & elbaz 2001 ; giavalisco et al . 2004a ; schiminovich et al . 2005 ; takeuchi et al . 2005 ; see als... | using the multiwavelength photometric and spectroscopic data covering the chandra deep field south obtained within the great observatories origins deep survey , we investigate the rest - frame uv properties of galaxies to , including the evolution of the luminosity function , the luminosity density , star formation rat... | using the multiwavelength photometric and spectroscopic data covering the chandra deep field south obtained within the great observatories origins deep survey , we investigate the rest - frame uv properties of galaxies to , including the evolution of the luminosity function , the luminosity density , star formation rat... |
astro-ph0609016 | c | we use the goods cdf - s optical and near - ir observations to derive the evolution of the rest - frame 1500 and 2800 luminosity functions , luminosity densities and star formation rates to @xmath0 . taking advantage of the high resolution @xmath8 acs imaging , we also derive the evolution the rest - frame uv morpho... | we find a significant brightening ( mag ) in the rest - frame 2800 characteristic magnitude ( ) over the redshift range and no evolution at higher redshifts . the rest - frame 2800 luminosity density shows an increase by a factor over the redshift range investigated . the extinction corrected sfr is a factor ( ) ... | using the multiwavelength photometric and spectroscopic data covering the chandra deep field south obtained within the great observatories origins deep survey , we investigate the rest - frame uv properties of galaxies to , including the evolution of the luminosity function , the luminosity density , star formation rat... |
astro-ph9909129 | c | using the refurbished arecibo gregorian telescope we detected 43 galaxies with 22.0 mag arcsec@xmath0 @xmath1 @xmath2(0 ) @xmath1 25.0 mag arcsec@xmath0 . the detected galaxies range in color from the very blue through the the first 21-cm detection of very red lsb galaxies , while their h i mass - to - luminosity ra... | the detected galaxies range from 22.0 mag arcsec (0 ) 25.0 mag arcsec , with colors ranging from the blue through the first detection of a very red lsb galaxies ( bv =.7 to 1.7 ) . the m/l of these galaxies ranges from 0.1 / 50 / , showing this sample to range from very gas poor to possibly the most gas rich gal... | using the refurbished 305 m arecibo gregorian telescope , we detected 43 low surface brightness ( lsb ) galaxies from the catalog of oneil , bothun , & cornell ( 1997a ) . the detected galaxies range from 22.0 mag arcsec (0 ) 25.0 mag arcsec , with colors ranging from the blue through the first detection of a very re... |
1602.08050 | i | the progress of observational cosmology brings us more and more evidence of existence of dark energy , the nature of which is still unknown despite of significant efforts of researchers . on the other hand , the extensive theoretical modelling @xcite of this component of our universe leaves less and less hope that it i... | the dynamics of quintessential dark energy at the center of dark matter halo strongly depends on the value of effective sound speed ( in units of speed of light ) . if ( classical scalar field ) then the dark energy in the gravitationally bound systems is only slightly perturbed and its density is practically the same ... | we analyse the evolution of scalar field dark energy in the spherical halos of dark matter at the late stages of formation of gravitationally bound systems in the expanding universe . the dynamics of quintessential dark energy at the center of dark matter halo strongly depends on the value of effective sound speed ( in... |
0811.2327 | c | 8 diameter ( top spectrum ) , extranuclear spectrum for a ring with inner radius of 0@xmath71 and outer radius of 0@xmath72 from the nucleus ( bottom spectrum ) and the difference between the two ( middle spectrum ) . the extranuclear spectrum was scaled by the ratio between the areas of the nuclear and extranuclear ap... | , we observe a ring of active star formation , apparently in the galactic plane , with radius ofpc , an age ofmyr and total mass of ionized gas ofm . the radiation of the young stars in the ring accounts for at least 80% of the ionization observed in the br emitting gas , the remaining being due to radiation emitted by... | we analyse two - dimensional near - irband spectra from the inner 660pc of the seyfert galaxy ngc7582 obtained with the gemini gnirs ifu at a spatial resolution ofpc and spectral resolving power r . the nucleus harbors an unresolved source well reproduced by a blackbody of temperature tk , which we attribute to emissio... |
0811.2327 | i | two - dimensional near - ir @xmath0band spectroscopy from the inner 660@xmath1315pc@xmath2 of the seyfert galaxy ngc7582 , obtained with the gemini gnirs ifu at a spatial resolution of @xmath195pc@xmath2 and spectral resolution of @xmath33 , was used to map the molecular and ionized gas emission - line flux distributio... | we analyse two - dimensional near - irband spectra from the inner 660pc of the seyfert galaxy ngc7582 obtained with the gemini gnirs ifu at a spatial resolution ofpc and spectral resolving power r . the nucleus harbors an unresolved source well reproduced by a blackbody of temperature tk , which we attribute to emissio... | we analyse two - dimensional near - irband spectra from the inner 660pc of the seyfert galaxy ngc7582 obtained with the gemini gnirs ifu at a spatial resolution ofpc and spectral resolving power r . the nucleus harbors an unresolved source well reproduced by a blackbody of temperature tk , which we attribute to emissio... |
1212.4094 | i | the present time accelerated expansion of the universe discovered in the observations of the supernovae ia @xcite revived the discussion about the fate of our universe . a psychologically jeopardy variant of the universe future is that the permanently increasing scale factor @xmath0 and the hubble function @xmath1 can ... | we analyze late - time evolution of the universe in the framework of the self - consistent model , in which the dark matter is influenced by the archimedean - type force proportional to the four - gradient of the dark energy pressure . the dark energy is considered as a fluid with the equation of state of the relaxatio... | we analyze late - time evolution of the universe in the framework of the self - consistent model , in which the dark matter is influenced by the archimedean - type force proportional to the four - gradient of the dark energy pressure . the dark energy is considered as a fluid with the equation of state of the relaxatio... |
1208.3470 | i | gate tunable anderson localization of dirac electrons is inaccessible in standard field effect heterostructures due to the strong disorder - induced inhomogeneity of the local doping level ( electron - hole puddles ) @xcite ubiquitous in the materials that show dirac - like low energy spectrum , such as graphene @xci... | we analyze the effect of screening provided by the additional graphene layer in double layer graphene heterostructures ( dlgs ) on transport characteristics of dlg devices in the metallic regime . we find that the efficiency of defect charge screening is strongly dependent on the concentration and location of defects w... | we analyze the effect of screening provided by the additional graphene layer in double layer graphene heterostructures ( dlgs ) on transport characteristics of dlg devices in the metallic regime . the effect of gate - tunable charge density in the additional layer is two - fold : it provides screening of the long - ran... |
1412.4118 | c | in this paper , we have considered , within a tight binding model , electron conduction in a multi - terminal systrem following the switch - on of a time dependent bias . our formalism , which mostly relies on the method developed in refs . @xcite , is an example of a partition - free approach , whereby the whole syste... | we apply the nonequilibrium green s function ( negf ) formalism to the problem of a multi - terminal nanojunction subject to an arbitrary time - dependent bias . in particular , we show that taking a generic one - particle system hamiltonian within the wide band limit approximation ( wbla ) , it is possible to obtain a... | we apply the nonequilibrium green s function ( negf ) formalism to the problem of a multi - terminal nanojunction subject to an arbitrary time - dependent bias . in particular , we show that taking a generic one - particle system hamiltonian within the wide band limit approximation ( wbla ) , it is possible to obtain a... |
hep-ph0610323 | i | quantum chromodynamics ( qcd ) exhibits various states of matter depending on the environment @xcite : a strongly coupled quark - gluon plasma ( sqgp ) has been discovered at the relativistic heavy icon collider ( rhic ) @xcite and various color superconductors presumably exist in the cores of the compact stellar obj... | it is unavoidable not only in monte - carlo simulations on the lattice but in the mean - field approximation as well . a simple model deriving from quantum chromodynamics ( qcd ) in the double limit of large quark mass and large quark chemical potential exemplifies how the sign problem arises in the polyakov loop dynam... | we argue the sign problem of the fermion determinant at finite density . it is unavoidable not only in monte - carlo simulations on the lattice but in the mean - field approximation as well . a simple model deriving from quantum chromodynamics ( qcd ) in the double limit of large quark mass and large quark chemical pot... |
astro-ph9801280 | i | theoretical analyses of the tidal interaction between close binaries can be classified according to whether an equilibrium tide is assumed or the dynamical tide is taken into account . the theory of the equilibrium tide is based on the assumption that a star subject to the tidal disturbance of a companion instantly adj... | we calculate the dynamical tides raised on a non rotating solar type star by a close stellar or planetary companion . we compute the torque exerted on the star by a companion in circular orbit , and determine the potentially observable magnitude of the tidally induced velocity at the stellar photosphere . these calcu... | we calculate the dynamical tides raised on a non rotating solar type star by a close stellar or planetary companion . dissipation arising from a turbulent viscosity operating in the convection zone and radiative damping in the radiative core are considered . we compute the torque exerted on the star by a companion... |
astro-ph9801280 | r | the calculations presented in the following section are applied to the standard solar model described by christensen et al . _ ( 1996 ) . the torque associated with the equilibrium tide was calculated as indicated in [ sec : asy ] . as mentioned there , this calculation is only expected to apply at very low frequenc... | dissipation arising from a turbulent viscosity operating in the convection zone and radiative damping in the radiative core are considered . this behavior is due to the small value of the brunt - visl frequency in the interior regions of the convection zone . it is shown that although the companion may go through... | we calculate the dynamical tides raised on a non rotating solar type star by a close stellar or planetary companion . dissipation arising from a turbulent viscosity operating in the convection zone and radiative damping in the radiative core are considered . we compute the torque exerted on the star by a companion... |
astro-ph9801280 | c | it is of interest to apply these results to the system 51 pegasi , for which the orbital period ( assuming the observed oscillations are due to a companion ) is @xmath165 @xmath307 if the companion is a jupiter mass planet ( @xmath308 ) , then the tidal orbital evolution timescale given by ( [ torb ] ) is @xmath309 ... | we find that the turbulent viscosity that is required to provide the observed circularization rates of main sequence solar type binaries is about fifty times larger than that simply estimated from mixing length theory for non rotating stars . this result is insensitive to the magnitude of the turbulent viscosity assu... | we calculate the dynamical tides raised on a non rotating solar type star by a close stellar or planetary companion . dissipation arising from a turbulent viscosity operating in the convection zone and radiative damping in the radiative core are considered . we compute the torque exerted on the star by a companion... |
cond-mat0411092 | i | the theory of the cuprate high temperature superconductors remains one of the most important and daunting problems in condensed matter physics . the high @xmath2 cuprate superconductors are layered materials with relatively complex structures and chemical composition . they are highly correlated , with an effective ban... | we address the possible reduction of the two - band model to a low - energy single - band one , as it was suggested by zhang and rice . comparing the two - band hubbard model properties with the single - band hubbard model ones , we have found similar low - energy physics provided that the next - nearest - neighbor hop... | we calculate the properties of the two - band hubbard model using the dynamical cluster approximation . the phase diagram resembles the generic phase diagram of the cuprates , showing a strong asymmetry with respect to electron and hole doped regimes , in agreement with experiment . asymmetric features are also seen in... |
cond-mat0411092 | i | in this paper we use the dca to calculate the properties of the two - band hubbard model . the 2@xmath1612-site cluster phase diagram resembles the generic phase diagram of the cuprates and exhibits electron - hole asymmetry . we also find asymmetric features for the one - particle spectral functions and for the releva... | we calculate the properties of the two - band hubbard model using the dynamical cluster approximation . the phase diagram resembles the generic phase diagram of the cuprates , showing a strong asymmetry with respect to electron and hole doped regimes , in agreement with experiment . asymmetric features are also seen in... | we calculate the properties of the two - band hubbard model using the dynamical cluster approximation . the phase diagram resembles the generic phase diagram of the cuprates , showing a strong asymmetry with respect to electron and hole doped regimes , in agreement with experiment . asymmetric features are also seen in... |
1609.00180 | i | charge transfer ( ct ) in biological molecules attracts recently considerable interest among the physical , chemical , biological and medical communities . it also attracts a broad spectrum of interdisciplinary scientists and engineers . this is because ct constitutes the basis of many biological processes e.g. in vari... | we call _ monomer _ a b - dna base pair and study , analytically and numerically , electron or hole oscillations in _ monomers _ , _ dimers _ and _ trimers_. we employ two tight binding ( tb ) approaches : ( i ) at the base - pair level , using the on - site energies of the base pairs and the hopping parameters between... | we call _ monomer _ a b - dna base pair and study , analytically and numerically , electron or hole oscillations in _ monomers _ , _ dimers _ and _ trimers_. we employ two tight binding ( tb ) approaches : ( i ) at the base - pair level , using the on - site energies of the base pairs and the hopping parameters between... |
astro-ph0304303 | c | in this work we studied the possibility that the progenitors of current normal field galaxies are dla galaxies , host of absorbing @xmath8 clouds in the context of hierarchical clustering , where galaxies form from the merger of smaller substructures . dlas observations provide information on the ism of the host object... | we found that the progenitors of current galaxies in the field with mean and virial circular velocity of could be the associated dla galaxies . we found the in the ism and sp to have more homogeneous abundances than the [ fe / h ] and [ zn / h ] ones . in our models , an analysis of the metallicity content of the isms ... | we carried out a comprehensive analysis of the chemical properties of the interstellar medium ( ism ) and the stellar population ( sp ) of current normal galaxies and their progenitors in a hierarchical clustering scenario . we compared the results with observations of damped lyman- systems ( dlas ) under the hypothesi... |
0704.1275 | i | rotation is a universal stellar physical attribute . this conclusion is supported by an enormous body of observational data , accrued over a period of nearly 100 years , from which information about rotational speeds and periods , the dependence of these quantities on parameters such as mass and age ( i.e. , evolutiona... | we conduct a systematic examination of the properties of models for chemically homogeneous , differentially rotating , main - sequence stars of mass . the models were constructed using a code based on a reformulation of the self - consistent field method of computing the equilibrium stellar structure for a specified co... | we conduct a systematic examination of the properties of models for chemically homogeneous , differentially rotating , main - sequence stars of mass . the models were constructed using a code based on a reformulation of the self - consistent field method of computing the equilibrium stellar structure for a specified co... |
0704.1275 | i | the scf approach to computing the structure of rotating stars is robust and efficient , capable of yielding converged models of stars of all masses , with internal angular - velocity distributions covering the range from uniform to extreme differential rotation . the code described in paper i has been upgraded throught... | relative to nonrotating stars of the same mass , these models all have reduced luminosities and effective temperatures , and flattened photospheric shapes ( i.e. , decreased polar radii ) with equatorial radii that can be larger or smaller , depending on the degree of differential rotation . for a fixed ratio of the ax... | we conduct a systematic examination of the properties of models for chemically homogeneous , differentially rotating , main - sequence stars of mass . the models were constructed using a code based on a reformulation of the self - consistent field method of computing the equilibrium stellar structure for a specified co... |
1104.4347 | c | the adiabatic ekpyrotic mechanism is the unique , non - inflationary single - field mechanism with unit sound speed that generates a scale invariant spectrum for @xmath5 on an attractor background . while originally proposed assuming a contracting universe , in this paper we have shown that the mechanism works equally ... | adiabatic ekpyrotic " mechanism proposed recently in arxiv:0910.2230 . whereas the original proposal assumed a slowly contracting background , the present work shows that the mechanism works equally well on an expanding background . this greatly expands the realm of broader cosmological scenarios in which this mechanis... | we consider a cosmological scenario in which a scale - invariant spectrum of curvature perturbations is generated by a rapidly - evolving equation of state on a slowly expanding background . this scenario generalizes the adiabatic ekpyrotic " mechanism proposed recently in arxiv:0910.2230 . whereas the original propos... |
math0304243 | i | consider a linear analytic ordinary differential equation @xmath1 with a nonresonant irregular singularity of order ( the poincar rank ) @xmath2 at 0 ( or briefly , an irregular equation ) . this means that @xmath3 is a holomorphic matrix function such that the matrix @xmath4 has distinct eigenvalues ( denote them by @... | we consider a linear analytic ordinary differential equation with complex time having a nonresonant irregular singular point . v.i.arnold asked the following question : is it true that some operators from the monodromy group of the perturbed ( fuchsian ) equation tend to stokes operators of the nonperturbed irregular e... | we consider a linear analytic ordinary differential equation with complex time having a nonresonant irregular singular point . we study it as a limit of a generic family of equations with confluenting fuchsian singularities . in 1984 v.i.arnold asked the following question : is it true that some operators from the m... |
math0304243 | r | everywhere below ( whenever the contrary is not specified ) we consider that the ( nonperturbed ) irregular equation under consideration has poincar rank @xmath20 . in the present section we recall the statements from [ 6 ] expressing the stokes operators as limit transition operators between monodromy eigenbases of th... | we consider the case of poincar rank 1 only . we show ( in dimension two ) that generically no monodromy operator tends to a stokes operator ; on the other hand , in any dimension commutators of appropriate noninteger powers of the monodromy operators around singular points tend to stokes operators . _ stokes operat... | we consider a linear analytic ordinary differential equation with complex time having a nonresonant irregular singular point . we study it as a limit of a generic family of equations with confluenting fuchsian singularities . in 1984 v.i.arnold asked the following question : is it true that some operators from the m... |
1110.2666 | i | let us briefly summarize our key observations . we have demonstrated that coulomb blockade corrections to both local and non - local conductances in metallic conductors may change significantly provided the electron distribution function in at least one of the leads is driven out of equilibrium . provided the conduc... | alters the electron distribution function in the wire in the vicinity of another junction thus modifying both its noise and the coulomb blockade correction to its conductance . we evaluate such interaction corrections to both local and non - local conductances demonstrating non - trivial coulomb anomalies in the system... | we consider a metallic wire coupled to two metallic electrodes via two junctions placed nearby . a bias voltage applied to one of such junctions alters the electron distribution function in the wire in the vicinity of another junction thus modifying both its noise and the coulomb blockade correction to its conductance ... |
0812.0907 | i | the competition between a short - ranged interaction favoring local order and a long - range interaction frustrating it on larger spatial scales is often used to explain pattern formation in chemistry , biology and physics @xcite . the role of the long - range interaction is to avoid the global phase separation favore... | we consider a one - dimensional lattice of ising - type variables where the ferromagnetic exchange interaction between neighboring sites is frustrated by a long - ranged anti - ferromagnetic interaction of strength between the sites and , decaying as , with . for our monte carlo study shows that the on - site magnetiza... | we consider a one - dimensional lattice of ising - type variables where the ferromagnetic exchange interaction between neighboring sites is frustrated by a long - ranged anti - ferromagnetic interaction of strength between the sites and , decaying as , with . for smaller than a certain threshold , which is larger than ... |
1502.05680 | i | the problem of finding a highly connected subset of vertices in a large graph arises in a number of applications across science and engineering . within social network analysis , a highly connected subset of nodes is interpreted as a community @xcite . many approaches to data clustering and dimensionality reduction con... | we consider a random sparse graph with bounded average degree , in which a subset of vertices has higher connectivity than the background . in particular , the average degree inside this subset of vertices is larger than outside ( but still bounded ) . given a realization of such graph , we aim at identifying the hidde... | we consider a random sparse graph with bounded average degree , in which a subset of vertices has higher connectivity than the background . in particular , the average degree inside this subset of vertices is larger than outside ( but still bounded ) . given a realization of such graph , we aim at identifying the hidde... |
1410.6694 | i | nanostructures with quantum dots in proximity to superconducting electrodes are an ideal playground to study superconducting correlations in systems with few degrees of freedom that exhibit strong coulomb - interaction effects . @xcite intriguingly , these types of structures are at the heart of recent proposals to gen... | in particular the noise spectrum shows sharp dips at the frequency of the coherent oscillations of cooper pairs between dot and superconductor . this feature is most pronounced when the superconducting correlation is maximal . the height of these steps is related to the effective coupling strength of the excitations . | we consider a single - level quantum dot tunnel - coupled to one normal and one superconducting lead . we employ a diagrammatic real - time approach to calculate the finite - frequency current noise for subgap transport . the noise spectrum gives direct access to the internal dynamics of the dot . in particular the noi... |
1410.6694 | r | in this section we come to the actual focus of the present paper , the finite - frequency noise associated to the current flow through the hybrid quantum - dot system , which we calculate based on the diagrammatic real - time approach introduced before . the discussion of the finite - frequency noise is divided into th... | the noise spectrum gives direct access to the internal dynamics of the dot . furthermore , in the quantum - noise regime , , the noise spectrum exhibits steps at frequencies equal to the andreev addition energies . the finite - frequency noise spectrum hence provides a full spectroscopy of the system . | we consider a single - level quantum dot tunnel - coupled to one normal and one superconducting lead . we employ a diagrammatic real - time approach to calculate the finite - frequency current noise for subgap transport . the noise spectrum gives direct access to the internal dynamics of the dot . in particular the noi... |
math0004099 | i | [ [ section ] ] for a simple lie algebra @xmath0 over @xmath1 with cartan matrix @xmath2 let @xmath3 . thus @xmath4 for the @xmath5 series , @xmath6 for @xmath7 and @xmath8 for @xmath9 . the quantum group associated with @xmath0 is a hopf algebra over @xmath10 , where @xmath11 is the quantum parameter . to fix the o... | we consider quantum invariants of 3-manifolds associated with arbitrary simple lie algebras . we then show that the projective quantum invariant is always an algebraic integer , if the quantum parameter is a prime root of unity . we also show that the projective quantum invariant of rational homology 3-spheres has a pe... | we consider quantum invariants of 3-manifolds associated with arbitrary simple lie algebras . using the symmetry principle we show how to decompose the quantum invariant as the product of two invariants , one of them is the invariant corresponding to the projective group . we then show that the projective quantum invar... |
0709.2766 | i | the introduction of a positive cosmological constant in the einstein equations of general relativity gives rise to a wide variety of new interesting solution spacetimes , in particular , spacetimes containing both `` black hole '' and `` cosmological '' regions . as in the case of black - hole spacetimes with vanishing... | we consider solutions to the linear wave equation on a non - extremal maximally extended schwarzschild - de sitter spacetime arising from arbitrary smooth initial data prescribed on an arbitrary cauchy hypersurface . ( in particular , no symmetry is assumed on initial data , and the support of the solutions may contain... | we consider solutions to the linear wave equation on a non - extremal maximally extended schwarzschild - de sitter spacetime arising from arbitrary smooth initial data prescribed on an arbitrary cauchy hypersurface . ( in particular , no symmetry is assumed on initial data , and the support of the solutions may contain... |
1305.5005 | i | we build upon the foundation subjects of fluid flow and front propagation , both central dynamical mechanisms in nature . exemplars of fluid flow include oceanic and atmospheric flow , industrial mixing , and microfluidics . we might also include such systems as phase space flow and swarms of moving agents . well - stu... | it is shown that the progress of fronts in these systems may be mediated by a turnstile mechanism akin to that found in chaotic advection . these differences must be accommodated in the correct construction of the new turnstile . as an application [ sec : lead_paragraph ] _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ... | we consider the propagation of fronts in a periodically driven flowing medium . it is shown that the progress of fronts in these systems may be mediated by a turnstile mechanism akin to that found in chaotic advection . we first define the modified ( `` active '' ) turnstile lobes according to the evolution of point so... |
1203.3128 | i | we consider the two - way wireless relaying scenario shown in fig.[dnf_protocol ] . two - way data transfer takes place between the nodes a and b with the help of the relay r. it is assumed that all the three nodes operate in half - duplex mode , i.e. , they can not transmit and receive simultaneously in the same frequ... | we consider the wireless two - way relay channel , in which two - way data transfer takes place between the end nodes with the help of a relay . for the denoise - and - forward ( dnf ) protocol , it was shown by koike - akino et . al . that adaptively changing the network coding map used at the relay greatly reduces th... | we consider the wireless two - way relay channel , in which two - way data transfer takes place between the end nodes with the help of a relay . for the denoise - and - forward ( dnf ) protocol , it was shown by koike - akino et . al . that adaptively changing the network coding map used at the relay greatly reduces th... |
1311.3272 | i | the statistical isotropy of the cosmic microwave background ( cmb ) is one of the central pillars in modern cosmology . manifesting the direction independence of the primordial spectrum at the onset of the hot era , it is renowned for its robustness against modifications in the bulk of inflationary models . simple reas... | we constrain several models of the early universe that predict a statistical anisotropy of the cosmic microwave background ( cmb ) sky . we make use of wmap9 maps deconvolved with beam asymmetries . this allows to strengthen the limits on the parameters of models established earlier in the literature . the upper limit ... | we constrain several models of the early universe that predict a statistical anisotropy of the cosmic microwave background ( cmb ) sky . we make use of wmap9 maps deconvolved with beam asymmetries . as compared to previous releases of wmap data , they do not exhibit the anomalously large quadrupole of statistical aniso... |
hep-ph0611164 | i | it is known that the evident differences between quarks and leptons may be no more than the low energy manifestation of a more symmetric underlying theory . in particular it has been shown that one may construct four dimensional models which are invariant under a discrete quark - lepton ( ql ) symmetry , whereby one in... | we construct a complete five dimensional quark - lepton symmetric model , with all fields propagating in the bulk . the extra dimension forms an orbifold with the zero mode fermions corresponding to standard model quarks localised at one fixed point . flavour changing neutral currents resulting from kaluza klein gluon ... | we construct a complete five dimensional quark - lepton symmetric model , with all fields propagating in the bulk . the extra dimension forms an orbifold with the zero mode fermions corresponding to standard model quarks localised at one fixed point . zero modes corresponding to left(right)-chiral leptons are localised... |
0904.0646 | i | bars are expected to have a profound effect on disk galaxy evolution because they constitute a major departure from an axial symmetry and hence facilitate angular momentum and mass redistribution . despite prolonged and focused investigation of bar formation and evolution many theoretical and observational issues remai... | these models are tested against those published in the literature in order to extend them and to include the gaseous component in the follow up paper . specifically , we are interested in the angular momentum , , redistribution in the disk - halo system during these two evolutionary phases without distinguishing betwee... | we construct and evolve three one - parameter families and one two - parameter family of steady - state models of stellar disks embedded in live dark matter ( dm ) halos , in order study the dynamical and secular phases of bar evolution . these models are tested against those published in the literature in order to ext... |
0904.0646 | r | the model sequences described in table 2 differ only by the parameters of dm distribution as given by eq . 2 . these include the total mass of the halo , its core size and the gaussian truncation radii . as the bar properties and angular momentum evolution are both heavily dependent on the mass distribution in the sy... | the rate of transfer in the disk and the halo is followed up in order to identify sites and times of peak activity in emission and absorption . within the corotation radius , , this phenomenon appears concurrent with the near absence of transfer between the disk and the halo , and is associated with the halo _ emitting... | we construct and evolve three one - parameter families and one two - parameter family of steady - state models of stellar disks embedded in live dark matter ( dm ) halos , in order study the dynamical and secular phases of bar evolution . these models are tested against those published in the literature in order to ext... |
0904.0646 | c | we have constructed and evolved three one - parameter and one two - parameter sequences of dm halos hosting a standard asymmetric stellar disk . all models developed bars and we have followed their evolution over a hubble time . the properties of the bars , such as their strength , pattern speed , size , corotation rad... | we construct and evolve three one - parameter families and one two - parameter family of steady - state models of stellar disks embedded in live dark matter ( dm ) halos , in order study the dynamical and secular phases of bar evolution . we confirm the previous results and quantify for the first time the dual role tha... | we construct and evolve three one - parameter families and one two - parameter family of steady - state models of stellar disks embedded in live dark matter ( dm ) halos , in order study the dynamical and secular phases of bar evolution . these models are tested against those published in the literature in order to ext... |
1503.06143 | i | the steady water - wave problem concerns two - dimensional water waves propagating with constant velocity and without change of shape . historically , the focus has mainly been on irrotational waves , which are waves where the vorticity @xmath0 of the velocity field @xmath1 is identically zero . one reason for this is ... | we construct small - amplitude solitary traveling gravity - capillary water waves with a finite number of point vortices along a vertical line , on finite depth . this is done using a local bifurcation argument . the properties of the resulting waves are also examined : we find that they depend significantly on the pos... | we construct small - amplitude solitary traveling gravity - capillary water waves with a finite number of point vortices along a vertical line , on finite depth . this is done using a local bifurcation argument . the properties of the resulting waves are also examined : we find that they depend significantly on the pos... |
1403.6170 | i | investigation of the cut and paste behaviour of zeta - regularized determinants has been initiated by forman @xcite and burghelea - friedlander - kappeler in @xcite . their studies have triggered further analysis by various authors including park - wojciechowski @xcite and lee @xcite . the approach of @xcite and @xcite... | we define the combinatorial dirichlet - to - neumann operator and establish a gluing formula for determinants of discrete laplacians using a combinatorial gaussian quantum field theory . in case of a diagonal inner product on cochains we provide an explicit local expression for the discrete dirichlet - to - neumann ope... | we define the combinatorial dirichlet - to - neumann operator and establish a gluing formula for determinants of discrete laplacians using a combinatorial gaussian quantum field theory . in case of a diagonal inner product on cochains we provide an explicit local expression for the discrete dirichlet - to - neumann ope... |
0709.0635 | c | we have written the explicit formulas for the superpropagators of the p@xmath3 m in presence of branes . with two or three branes we used a schwarz - christoffel mapping to produce the integral kernels with the correct boundary conditions . with more than three branes we have introduced hyperelliptic curves @xmath60 of... | we derive the explicit form of the superpropagators in presence of general boundary conditions ( coisotropic branes ) for the poisson sigma model . we use first order riemann theta functions with odd singular characteristics on the jacobian variety of a hyperelliptic riemann surface ( canonical setting ) . in genus the... | we derive the explicit form of the superpropagators in presence of general boundary conditions ( coisotropic branes ) for the poisson sigma model . this generalizes the results presented in and for kontsevich s angle function used in the deformation quantization program of poisson manifolds . the relevant superpropagat... |
cond-mat0010480 | i | in this paper we describe a new approach to perturbation theory for systems with local moments or , in principle , any local order parameter . we begin by summarizing the present status of weak coupling perturbation theories for such systems , with the hubbard model as a primary example . over the course of the last d... | we describe a new microscopic approach for analyzing interacting electron systems with local moments or , in principle , any local order parameter . hubbard field is introduced to decouple the static spin components of the interaction at each site . the effective action reduces to a classical heisenberg model at half f... | we describe a new microscopic approach for analyzing interacting electron systems with local moments or , in principle , any local order parameter . we specialize attention to the doped mott insulator phase of the hubbard model , where standard weak coupling perturbation methods fail . a rotationally invariant straton... |
astro-ph9708129 | i | gravitational lensing systems have relatively simple geometry and most of them are cosmological in nature because of their scale . these two facts have stimulated cosmologists in the last few decades to use gravitational lensing as a tool in physical cosmology . there are four distinct applications of gravitational len... | the deformation and deflection of light beams as they interact with each lens plane are computed using the filled - beam approximation . we use a particle - particle / particle - mesh ( p m ) n - body numerical code to simulate the formation of large scale structure in the universe . this algorithm constitutes a maj... | we describe a numerical algorithm which simulates the propagation of light in inhomogeneous universes . this algorithm computes the trajectories of light rays between the observer , located at redshift , and distant sources located at high redshift , using the multiple lens - plane method . the deformation and deflecti... |
astro-ph9708129 | r | we consider three different cosmological models : an einstein - de sitter model with @xmath2 , @xmath109 , an open model with @xmath3 , @xmath109 , and a flat , low - density model with @xmath3 , @xmath4 , where @xmath7 and @xmath192 are the present values of the density parameter and cosmological constant , respectiv... | this algorithm computes the trajectories of light rays between the observer , located at redshift , and distant sources located at high redshift , using the multiple lens - plane method . in addition , we take into account the observed morphology - density relation when assigning morphological types to galaxies , somet... | we describe a numerical algorithm which simulates the propagation of light in inhomogeneous universes . this algorithm computes the trajectories of light rays between the observer , located at redshift , and distant sources located at high redshift , using the multiple lens - plane method . the deformation and deflecti... |
0812.1159 | m | let @xmath8 be the mean motion of a local moving group , in the local standard of rest , with @xmath9 a unit vector pointing in the direction of the galactic center , @xmath10 in the direction of the sun s galactic orbital motion , and @xmath11 pointing toward the north galactic pole . at any point on the sky described... | we describe a procedure to identify stars from nearby moving groups and associations out of catalogs of stars with large proper motions . we show that from the mean motion vector of a known or suspected moving group , one can identify additional members of the group based on proper motion data and photometry in the opt... | we describe a procedure to identify stars from nearby moving groups and associations out of catalogs of stars with large proper motions . we show that from the mean motion vector of a known or suspected moving group , one can identify additional members of the group based on proper motion data and photometry in the opt... |
0812.1159 | c | we have presented an algorithm to identify probable members of any known nearby moving group from large catalogs of proper motion stars . the technique identifies prospective members based on the orientation of their proper motion vector , which aligns with the projected motion of the group in the plane of the sky , an... | we confirm three of the candidates to be new members of the group : tyc 1186 - 706 - 1 , tyc 7443 - 1102 - 1 , and tyc 2211 - 1309 - 1 which are late - k and early - m dwarfs 45 - 60pc from the sun . we argue that the present technique could be applied to other large proper motion catalogs to identify most of the elusi... | we describe a procedure to identify stars from nearby moving groups and associations out of catalogs of stars with large proper motions . we show that from the mean motion vector of a known or suspected moving group , one can identify additional members of the group based on proper motion data and photometry in the opt... |
astro-ph0307395 | c | one of the major projects of modern extragalactic astronomy is the pursuit of a quantitative and automatic morphological galaxy classification scheme . the hubble sequence is becoming more inadequate , and new systems are needed . a quantitative description of morphology will allow astronomers to give quantitative rela... | we describe application of the ` shapelet ' linear decomposition of galaxy images to morphological classification using images of 3000 galaxies from the sloan digital sky survey . we find that each of these nine principal components contains unique morphological information , and give a description of each principal co... | we describe application of the ` shapelet ' linear decomposition of galaxy images to morphological classification using images of 3000 galaxies from the sloan digital sky survey . after decomposing the galaxies we perform a principal component analysis to reduce the number of dimensions of the shapelet space to nine . ... |
astro-ph0607574 | i | cosmic - rays with energies up to about 1000tev are thought to be accelerated in supernova remnant shocks @xcite . in the simplest , idealized model of the acceleration process , test particles interact with a shock discontinuity to produce a power - law momentum distribution of cosmic - rays . photon spectra produced ... | contributions from the synchrotron , inverse compton , nonthermal bremsstrahlung and neutral - pion decay processes are computed separately using a common parameterization of the underlying distribution of nonthermal particles . the shapes of the particle distribution functions and the shape of the seed photon spectrum... | we describe models of nonthermal photon emission from a homogeneous distribution of relativistic electrons and protons . contributions from the synchrotron , inverse compton , nonthermal bremsstrahlung and neutral - pion decay processes are computed separately using a common parameterization of the underlying distribut... |
1011.4073 | i | before the recent discovery of the six short period binary wd systems containing @xmath1 elm wds @xcite , there were only six double wd systems known to have short enough orbital periods to merge within a hubble time ( see * ? ? ? * and references therein ) . even though the supernovae ia progenitor survey ( spy ) iden... | no main - sequence or neutron star companions are visible in the available optical photometry , radio , and x - ray data . thus , the companions are most likely wds . we have now tripled the number of known merging wd systems . we discuss the characteristics of this merger sample and potential links to underluminous su... | we describe new radial velocity and x - ray observations of extremely low - mass white dwarfs ( elm wds , ) in the sloan digital sky survey data release 4 and the mmt hypervelocity star survey . we identify four new short period binaries , including two merger systems . these observations bring the total number of shor... |
1011.4073 | c | @xcite , @xcite , and this paper discuss radial velocity observations of 11 elm wd candidates identified in the sdss dr4 @xcite and 12 elm wds identified in the hypervelocity star survey of @xcite . one of the targets is common to both samples . in addition , one of the dr4 targets ( j2049 + 0005 ) is most likely an a ... | we describe new radial velocity and x - ray observations of extremely low - mass white dwarfs ( elm wds , ) in the sloan digital sky survey data release 4 and the mmt hypervelocity star survey . twelve of these systems will merge within a hubble time due to gravitational wave radiation . we also find evidence for a new... | we describe new radial velocity and x - ray observations of extremely low - mass white dwarfs ( elm wds , ) in the sloan digital sky survey data release 4 and the mmt hypervelocity star survey . we identify four new short period binaries , including two merger systems . these observations bring the total number of shor... |
gr-qc0003025 | i | it is often ( mistakenly ) believed that every kind of matter , on scales in which we do not need to consider its quantum features , has an energy density that is everywhere positive . ( in fact , we could think on this property as defining what we understand by classical matter ) . this is more precisely stated by say... | we demonstrate that a non - minimally coupled scalar field with a positive curvature coupling can easily violate all the standard energy conditions , up to and including the averaged null energy condition ( anec ) . we derive the classical solutions for gravity plus a general ( arbitrary ) massless non - minimally coup... | we describe the different possibilities that a simple and apparently quite harmless classical scalar field theory provides to violate the energy conditions . we demonstrate that a non - minimally coupled scalar field with a positive curvature coupling can easily violate all the standard energy conditions , up to and in... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.