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0903.4479 | c | the distribution of asteroids within the main belt provides a means to ascertain the mass distribution of material within the main belt and provides constraints for theoretical models developed to describe planet formation from protoplanetary disks encompassing our own proto - sun , as well as those extant around other... | irac 8.0 ( 80% completeness limitjy ) fields enabling us to probe the 0.51.0 km diameter asteroid population . were detected in the _ spitzer _ fls fields , whereas in the swire fields they are frequent . the swire data clearly samples asteroids in the middle and outer belts providing the first estimates of these km... | we present analysis of the asteroid surface density distribution of main belt asteroids ( mean perihelion au ) in five ecliptic latitude fields , , derived from deep _ large binocular telescope _ ( lbt )band ( 85% completeness limit mag ) and _ spitzer space telescope _ irac 8.0 ( 80% completeness limitjy ) fields ... |
0903.4479 | c | our combined optical survey of @xmath138 square degrees and _ spitzer _ irac 8.0 fields encompassing from 0.26 to @xmath139 square degrees of sky at five latitudes perpendicular to the ecliptic plane resulted in detection of 118 main belt asteroids , of which 91 are newly identified objects either at optical or infr... | the derived power law slopes of the number of asteroids per square degree are similar within each ecliptic latitude bin with a mean value of . for the 23 known asteroids detected in all four irac channels mean albedos range from to . no low albedo asteroids ( 0.1 ) our observed asteroid number densities at optical wave... | we present analysis of the asteroid surface density distribution of main belt asteroids ( mean perihelion au ) in five ecliptic latitude fields , , derived from deep _ large binocular telescope _ ( lbt )band ( 85% completeness limit mag ) and _ spitzer space telescope _ irac 8.0 ( 80% completeness limitjy ) fields ... |
cond-mat0308174 | i | a starting point in the analysis of coarsening systems , such as the phase separation dynamics following a quench from a disordered to an ordered phase , is the characterization of the asymptotic _ late - time _ behavior . most coarsening systems exhibit asymptotic dynamical scaling with the characteristic length scale... | we present cahn - hilliard and allen - cahn numerical integration algorithms that are unconditionally stable and so provide significantly faster accuracy - controlled simulation . our stability analysis is based on eyre s theorem and unconditional von neumann stability analysis , both of which we present . we develop a... | we present cahn - hilliard and allen - cahn numerical integration algorithms that are unconditionally stable and so provide significantly faster accuracy - controlled simulation . our stability analysis is based on eyre s theorem and unconditional von neumann stability analysis , both of which we present . numerical te... |
1106.0051 | i | given a compact metric space @xmath0 and a continuous map @xmath1 , the arising dynamical system can be studied from various points of view . on the one hand , one can investigate the topological dynamics determined by @xmath2 . on the other hand , one can investigate the set @xmath3 of @xmath2-invariant borel probabil... | we present examples of partially hyperbolic and topologically transitive local diffeomorphisms defined as skew products over a horseshoe which exhibit rich phase transitions for the topological pressure . it is associated to the coexistence of two equilibrium states with positive entropy . however , in some sense the e... | we present examples of partially hyperbolic and topologically transitive local diffeomorphisms defined as skew products over a horseshoe which exhibit rich phase transitions for the topological pressure . this phase transition follows from a gap in the spectrum of the central lyapunov exponents . it is associated to th... |
astro-ph0109220 | i | the infall of low - metallicity gas onto the milky way is a crucial component of virtually all galactic formation and evolution scenarios . the simple closed - box model of chemical evolution assumes no infall , inflow , or outflow within the given region being modeled , and is successful at explaining many of the obs... | we have extended the abundance analysis of complex c to encompass five sightlines . it may be necessary to reclassify complex c as mildly enriched galactic _ waste _ from the milky way or processed gas torn from a disrupted neighboring dwarf , as opposed to low - metallicity galactic _ fuel_. # 1to 0pt#1 | we present hst ghrs and stis observations of five qsos that probe the prominent high - velocity cloud ( hvc ) complex c , covering% of the northern sky . based upon a single sightline measurement ( mrk 290 ) , a metallicity [ s / h]=.05.12 has been associated with complex c by wakker ( 1999a , b ) . when coupled wi... |
astro-ph0109220 | c | we have undertaken a self - consistent ghrs and stis analysis of five different probes of hvc complex c. it has been suggested that complex c represents the best example of the predicted infalling low - metallicity gas responsible for fueling the bulk of star formation in the galaxy . such infalling gas is a necessar... | we present hst ghrs and stis observations of five qsos that probe the prominent high - velocity cloud ( hvc ) complex c , covering% of the northern sky . based upon a single sightline measurement ( mrk 290 ) , a metallicity [ s / h]=.05.12 has been associated with complex c by wakker ( 1999a , b ) . when coupled wi... | we present hst ghrs and stis observations of five qsos that probe the prominent high - velocity cloud ( hvc ) complex c , covering% of the northern sky . based upon a single sightline measurement ( mrk 290 ) , a metallicity [ s / h]=.05.12 has been associated with complex c by wakker ( 1999a , b ) . when coupled wi... |
astro-ph0309083 | i | seyferts are the most numerous class of active galactic nuclei ( agns ) . the two types of seyfert galaxies , type 1 ( with broad optical emission lines ) and type 2 ( with no such lines ) , can be unified by the combination of an obscuring dusty molecular torus around a central , accreting supermassive black hole , an... | the 3.3 m polycyclic aromatic hydrocarbon ( pah ) emission feature was used to estimate the absolute magnitude of a compact nuclear starburst ( less than a few hundred parsecs in size ) that is presumed to have occurred in the outer region of an obscuring dusty molecular torus around a central supermassive black hole . | we present infrared 2.84.1 m slit spectra of 32 seyfert 2 galaxies in the cfa and 12 m samples . the 3.3 m polycyclic aromatic hydrocarbon ( pah ) emission feature was used to estimate the absolute magnitude of a compact nuclear starburst ( less than a few hundred parsecs in size ) that is presumed to have occurred in ... |
astro-ph0309083 | c | to investigate the contribution from compact nuclear starbursts to the observed 34 @xmath0 m fluxes and to the total infrared ( 81000 @xmath0 m ) luminosities , the rest - frame equivalent widths of 3.3 @xmath0 m pah emission features ( ew@xmath38 ) and 3.3 @xmath0 m pah - to - infrared luminosity ratios ( l@xmath38/l@... | however , the rest - frame equivalent widths of the 3.3 m pah emission , and the 3.3 m pah - to - infrared luminosity ratios measured in this study suggest that compact nuclear starbursts generally do not contribute significantly to the observed 34 m nuclear fluxes or to the infrared luminosities of seyfert 2 galaxies ... | we present infrared 2.84.1 m slit spectra of 32 seyfert 2 galaxies in the cfa and 12 m samples . the 3.3 m polycyclic aromatic hydrocarbon ( pah ) emission feature was used to estimate the absolute magnitude of a compact nuclear starburst ( less than a few hundred parsecs in size ) that is presumed to have occurred in ... |
astro-ph0309083 | i | we have presented infrared 2.84.1 @xmath0 m slit spectra of 32 seyfert 2 galaxies in the cfa and 12@xmath0 m samples , and made the following main conclusions . 1 . by using the 3.3 @xmath0 m pah emission luminosity as an indicator of a compact nuclear starburst in the dusty torus , we found evidence for the prese... | we present infrared 2.84.1 m slit spectra of 32 seyfert 2 galaxies in the cfa and 12 m samples . we detected 3.3 m pah emission in 11 of the 32 seyfert 2 nuclei in our sample , providing evidence for the presence of compact nuclear starbursts in a significant fraction of seyfert 2 nuclei . if the dust properties in the... | we present infrared 2.84.1 m slit spectra of 32 seyfert 2 galaxies in the cfa and 12 m samples . the 3.3 m polycyclic aromatic hydrocarbon ( pah ) emission feature was used to estimate the absolute magnitude of a compact nuclear starburst ( less than a few hundred parsecs in size ) that is presumed to have occurred in ... |
1609.00731 | i | the optical transient psn j09093496 + 3307204 was discovered in the galaxy ngc 2770 on february 7 , 2015 in the catalina real - time transient survey , and on february 8 , 2015 by s. hoverton in the process of observations under the program snhunt . the transient is also known as sn 2015bh and snhunt275 . in the spectr... | we present medium - resolution spectroscopy and multicolor photometry for the optical transient psn j09093496 + 3307204 ( sn 2015bh ) in the galaxy ngc 2770 , which has transferred into the supernova phase . we considered several hypotheses of supernovae explosions following optical transients related with lbv . | we present medium - resolution spectroscopy and multicolor photometry for the optical transient psn j09093496 + 3307204 ( sn 2015bh ) in the galaxy ngc 2770 , which has transferred into the supernova phase . the observations were carried out between february 2015 to may 2016 . both at the phase of the sn impostor ( 2... |
1609.00731 | c | spectra of the optical transient 2015bh / ngc 2770 in the phases of sn impostor and real sn obtained with bta / scorpio are unusual , and they are similar to spectra of williams fe ii type classical novae . from spectral data it was established that in the impostor phase ( 2015a ) , an optically thick expanding shell... | both at the phase of the sn impostor ( 2015a ) and at the supernova phase ( 2015b ) , besides balmer emissions , the strong fe ii emissions are seen in the spectrum ; so , these spectra resemble those of williams fe ii type classical novae . the supernova progenitor is a luminous blue variable ( lbv ) star with the p... | we present medium - resolution spectroscopy and multicolor photometry for the optical transient psn j09093496 + 3307204 ( sn 2015bh ) in the galaxy ngc 2770 , which has transferred into the supernova phase . the observations were carried out between february 2015 to may 2016 . both at the phase of the sn impostor ( 2... |
astro-ph0612280 | i | in the last decades galactic globular clusters ( gcs ) have proven to be extremely important astrophysical laboratories for a wide range of problematics . indeed , the study of their stellar populations address fundamental questions ranging from stellar structure , evolution and dynamics to galaxy formation and the ear... | we present near ir color magnitude diagrams and physical parameters for a sample of 24 galactic globular clusters toward the bulge direction . in this paper the compilation includes measurements of the cluster reddening , distance , photometric metallicity , horizontal branch red clump , red giant branch morphologica... | we present near ir color magnitude diagrams and physical parameters for a sample of 24 galactic globular clusters toward the bulge direction . in this paper we discuss the properties of twelve new clusters ( out of 24 ) in addition to those previously studied and published by our group . the compilation includes meas... |
astro-ph0212135 | r | figure 10 shows the observed hei 2@xmath3p2@xmath3s / hi br@xmath4 ratio together with a representative sample of the costar models from section 3 . we have not plotted the wm - basic model here since it is very close in appearance to the costar dwarf model ( figure 3 ) . the behaviour seen is almost completely at vari... | the compact hii regions do not show any such decrease . although the normal hei recombination lines can be used to place constraints on the temperature of the hottest star present , the hei 2p2s / hi br ratio should not be used for this purpose in either galactic hii regions or in starburst galaxies , and conclusions f... | we present observations and models of the behaviour of the hi and hei lines between 1.6 and 2.2 m in a small sample of compact hii regions . as in our previous papers on planetary nebulae , we find that the ` pure ' 1.7007 m 4d3p and 2.16475 m 7g4f hei recombination lines behave approximately as expected as the effecti... |
astro-ph0212135 | c | we have presented models for the infrared helium and hydrogen recombination line ratios in compact hii regions . we fail to find any model that can accurately reproduce the hei 2@xmath3p2@xmath3s line strength as a function of effective temperature . we therefore would discourage anyone from using this ratio as a const... | we present observations and models of the behaviour of the hi and hei lines between 1.6 and 2.2 m in a small sample of compact hii regions . as in our previous papers on planetary nebulae , we find that the ` pure ' 1.7007 m 4d3p and 2.16475 m 7g4f hei recombination lines behave approximately as expected as the effecti... | we present observations and models of the behaviour of the hi and hei lines between 1.6 and 2.2 m in a small sample of compact hii regions . as in our previous papers on planetary nebulae , we find that the ` pure ' 1.7007 m 4d3p and 2.16475 m 7g4f hei recombination lines behave approximately as expected as the effecti... |
1209.5433 | i | identifying the stars that harbor circumstellar disks within young clusters and associations is an essential step in using disks to study star and planet formation . for instance , thorough surveys for disks provide well - defined samples of targets for detailed measurements of disk properties . in addition , by compar... | we present photometry at 324 for all known members of the upper scorpius association ( myr ) based on all images of these objects obtained with the _ spitzer space telescope _ and the _ wide - field infrared survey explorer_. we have used these data to identify the members that exhibit excess emission from circumstel... | we present photometry at 324 for all known members of the upper scorpius association ( myr ) based on all images of these objects obtained with the _ spitzer space telescope _ and the _ wide - field infrared survey explorer_. we have used these data to identify the members that exhibit excess emission from circumstel... |
1209.5433 | c | we have performed a census of the circumstellar disk population of the upper sco association ( @xmath0 myr ) using mid - ir images obtained with the _ spitzer space telescope _ and _ wise_. the results of this study are summarized as follows : 1 . we have analyzed all images of known members of upper sco at 3.6 , 4... | the fraction of members harboring inner primordial disks is% for b g stars ( ) and increases with later types to a value of% atm5 ( ) , in agreement with the results of previous disk surveys of smaller samples of upper sco members . these data indicate that the lifetimes of disks are longer at lower stellar masses ,... | we present photometry at 324 for all known members of the upper scorpius association ( myr ) based on all images of these objects obtained with the _ spitzer space telescope _ and the _ wide - field infrared survey explorer_. we have used these data to identify the members that exhibit excess emission from circumstel... |
astro-ph0703545 | r | the central stellar population parameters of each galaxy are obtained by averaging the values of all apertures within the central @xmath45 . the values are listed in table 4 with the error on the mean . in the following sections we will investigate these values and their correlations compared to those for galaxies in h... | , the seventeen isolated galaxies have mean central [ z / h] and [ e / fe] of and respectively and span a wide range of ages from 1.7 to 15 gyrs . we find that isolated galaxies follow similar scaling relations between central stellar population parameters and galaxy velocity dispersion to their counterparts in high de... | we present radial stellar population parameters for a subsample of 12 galaxies from the 36 isolated early - type galaxies of reda et al . using new long - slit spectra , central values and radial gradients for the stellar age , metallicity [ z / h ] and-element abundance [ e / fe ] are measured . similarly , the centra... |
1611.09857 | i | the history of galaxy formation and evolution appears to be linked to the growth of cosmic large - scale structure . in the present - day universe , clusters of galaxies represent some of the densest environments . massive and passive elliptical galaxies preferentially reside in cluster cores ( e.g. , @xcite ; @xcite )... | we observe the core region of a protocluster , achieving a typical rms sensitivity of 60 jy beam at a spatial resolution of . at least ten of our 18 alma smgs have spectroscopic redshifts of , placing them in the protocluster . our contiguous mm mapping highlights the importance of large - scale structures on the forma... | we present results from a deep 2 ( comoving scale of 3.7 mpc 5.5 mpc at ) survey at 1.1 mm taken with the atacama large millimeter / submillimeter array ( alma ) in the ssa22 field . we observe the core region of a protocluster , achieving a typical rms sensitivity of 60 jy beam at a spatial resolution of . we detec... |
1611.09857 | i | we have presented the results from a 103-pointing alma 1.1 mm mosaic in the ssa22 field . we covered a 7 arcmin@xmath60 area contiguously at the junction of a 50-mpc scale cosmic large - scale structure at @xmath3 containing three 1.1 mm sources discovered previously by the aztec / aste survey . observations were con... | we present results from a deep 2 ( comoving scale of 3.7 mpc 5.5 mpc at ) survey at 1.1 mm taken with the atacama large millimeter / submillimeter array ( alma ) in the ssa22 field . comparison between the alma map and a 1.1 mm map taken with the aztec camera on the atacama submillimeter telescope experiment ( aste... | we present results from a deep 2 ( comoving scale of 3.7 mpc 5.5 mpc at ) survey at 1.1 mm taken with the atacama large millimeter / submillimeter array ( alma ) in the ssa22 field . we observe the core region of a protocluster , achieving a typical rms sensitivity of 60 jy beam at a spatial resolution of . we detec... |
astro-ph0310029 | i | ultraluminous infrared galaxies ( ulirgs ) have infrared luminosities in excess of @xmath0 . these galaxies were first discovered by the iras satellite ( e.g. , soifer , neugebauer & houck 1987 ) . they are usually associated with mergers and interactions of galaxies ( e.g. , sanders & mirabel 1996 ) and their infrared... | we present results from a hubble space telescope ( hst ) study of the morphology and kinematics of ngc 6240 . this merging galaxy with a double nucleus is one of the nearest and best - studied ultraluminous infrared galaxies . we also map and model the emission - line velocity field at an off - nuclear position where a... | we present results from a hubble space telescope ( hst ) study of the morphology and kinematics of ngc 6240 . this merging galaxy with a double nucleus is one of the nearest and best - studied ultraluminous infrared galaxies . hst resolves both nuclei into seperate components . the distance between the northern and sou... |
astro-ph0310029 | c | we have presented the results of an hst study of the ulirg ngc 6240 . wfpc2 imaging was obtained in the broad b , v , and i - bands , as well as in @xmath10+[nii ] emission . a nicmos k - band image from the hst data archive was analyzed for comparison . stis ca triplet absorption - line spectroscopy was obtained of th... | the velocity dispersion of the gas is larger than expected for a cold disk . overall , the data indicate that line - of - sight projection effects , dust absorption , non - equilibrium merger dynamics , and the possible influence of a wind may be playing an important role in the observed kinematics . | we present results from a hubble space telescope ( hst ) study of the morphology and kinematics of ngc 6240 . this merging galaxy with a double nucleus is one of the nearest and best - studied ultraluminous infrared galaxies . hst resolves both nuclei into seperate components . the distance between the northern and sou... |
1108.4693 | i | it is well - established that the fraction of star - forming galaxies declines as a function of increasing local galaxy density in the low redshift universe . also known as the star formation - density relation @xcite , this correlation has been confirmed in many studies , primarily using optical and uv data to trace s... | we present results from a systematic study of star formation in local galaxy clusters using 22 m data from the wide - field infrared survey explorer ( wise ) . the 69 systems in our sample are drawn from the cluster infall regions survey ( cirs ) , and all have robust mass determinations . | we present results from a systematic study of star formation in local galaxy clusters using 22 m data from the wide - field infrared survey explorer ( wise ) . the 69 systems in our sample are drawn from the cluster infall regions survey ( cirs ) , and all have robust mass determinations . the all - sky wise data enabl... |
1108.4693 | r | the two central questions that we aim to address are how the mean specific star formation rate of cluster galaxies ( mssfr ) depends upon location within a cluster , and how the total integrated star formation rate of a cluster depends upon cluster mass . specifically , the mssfr is defined as the total star formation ... | the all - sky wise data enables us to quantify the amount of star formation , as traced by 22 m , as a function of radius well beyond , and investigate the dependence of total star formation rate upon cluster mass . we find that the fraction of star - forming galaxies increases with cluster radius but remains below the... | we present results from a systematic study of star formation in local galaxy clusters using 22 m data from the wide - field infrared survey explorer ( wise ) . the 69 systems in our sample are drawn from the cluster infall regions survey ( cirs ) , and all have robust mass determinations . the all - sky wise data enabl... |
1503.05981 | i | understanding the role and significance of dark matter in the evolution of baryonic components ( i.e. , conversion of the gaseous disk into stars ) is a critical aspect for realistic models of galaxy evolution . observational studies aimed at addressing the influence of dark matter in galaxy formation and evolution oft... | we present results from multiwavelength observations of the galaxy ngc5005 . we find an hi disc with a well - behaved flat rotation curve in the radial range 20 - 140 . optical broadband b and r and narrowband h from the wiyn 0.9 m telescope complement the 3.6 m data by providing information about the dominant stellar ... | we present results from multiwavelength observations of the galaxy ngc5005 . we use new neutral hydrogen ( hi ) observations from the very large array to examine the neutral gas morphology and kinematics . we find an hi disc with a well - behaved flat rotation curve in the radial range 20 - 140 . ionized gas observatio... |
astro-ph0607025 | i | in a high mass x - ray binary ( hmxb ) , a compact object , either a neutron star or a black hole , sweeps up material as it orbits through the stellar wind of a massive o- or b - type companion star . when the material is accreted onto the compact object , a fraction of its gravitational potential energy is converted ... | we present results from quantitative modeling and spectral analysis of the high mass x - ray binary system vela x-1 obtained with the _ chandra _ high energy transmission grating spectrometer . the emergent spectra are then computed as a function of the viewing angle accurately accounting for photon transport in three... | we present results from quantitative modeling and spectral analysis of the high mass x - ray binary system vela x-1 obtained with the _ chandra _ high energy transmission grating spectrometer . the observations cover three orbital phase ranges within a single binary orbit . the spectra exhibit emission lines from h - ... |
astro-ph0607025 | i | vela x-1 was observed by the _ chandra _ hetgs at three distinct orbital phase ranges . in order to understand the geometry and the dynamics of the x - ray irradiated stellar wind in this system , we have developed a monte carlo spectral simulator to predict the emission line spectrum for a given set of stellar wind ... | the properties of these x - ray lines are measured with the highest accuracy to date . in order to interpret and make full use of the high - quality data , we have developed a simulator , which calculates the ionization and thermal structure of a stellar wind photoionized by an x - ray source , and performs monte carlo... | we present results from quantitative modeling and spectral analysis of the high mass x - ray binary system vela x-1 obtained with the _ chandra _ high energy transmission grating spectrometer . the observations cover three orbital phase ranges within a single binary orbit . the spectra exhibit emission lines from h - ... |
0808.0546 | c | in this paper , we presented the results of multi - epoch vlbi astrometry with vera of the 22 ghz h@xmath0o masers associated with iras 22198 + 6336 in l1204 g . using the absolute positions of total 26 maser spots that were detected in at least three observing sessions , we derived the annual parallax of iras 2219... | we present results of multi - epoch vlbi observations with vera ( vlbi exploration of radio astrometry ) of the 22 ghz ho masers associated with a young stellar object ( yso ) iras 22198 + 6336 in a dark cloud l1204 g . based on the phase - referencing vlbi astrometry , we derive an annual parallax of iras 22198 + 6... | we present results of multi - epoch vlbi observations with vera ( vlbi exploration of radio astrometry ) of the 22 ghz ho masers associated with a young stellar object ( yso ) iras 22198 + 6336 in a dark cloud l1204 g . based on the phase - referencing vlbi astrometry , we derive an annual parallax of iras 22198 + 6... |
astro-ph9708070 | i | galaxy clusters , the largest virialized systems in the universe , are useful cosmological probes . for example , the abundance of massive clusters ( characterized either by mass or x - ray temperature ) depends sensitively on @xmath7 , the cosmological density parameter , and on @xmath8 , the rms amplitude of density ... | we generalize kaiser s scalefree scaling relations to arbitrary power spectra and low - density universes and show that simulated clusters generally follow these relations . this suggests that non - gravitational effects such as preheating or cooling must have played an important role in determining the properties of t... | we present results of n - body / gasdynamical simulations designed to investigate the evolution of x - ray clusters in a flat , low - density ,-dominated cold dark matter ( cdm ) cosmogony . the simulations include self - gravity , pressure gradients and hydrodynamical shocks , but neglect radiative cooling . the densi... |
astro-ph9708070 | r | table 2 summarizes the bulk properties of the ten clusters at @xmath91 . all quantities are computed within the virial radius . the majority of clusters have more than @xmath130 dark matter particles within the virial radius , except cl07a and cl08a , which have significantly fewer . this is a result of their physical ... | the gas in our simulated clusters is less centrally concentrated than the dark matter , and its radial density profile is well described by the familiar-model . as a result , the total mass and velocity dispersion of our clusters can be accurately inferred ( with uncertainty ) from their x - ray emission - weighted tem... | we present results of n - body / gasdynamical simulations designed to investigate the evolution of x - ray clusters in a flat , low - density ,-dominated cold dark matter ( cdm ) cosmogony . the simulations include self - gravity , pressure gradients and hydrodynamical shocks , but neglect radiative cooling . the densi... |
astro-ph9708070 | c | we have used n - body / gasdynamical simulations to study the structure and evolution of x - ray clusters formed in a low - density cdm universe ( @xmath13 , @xmath14 , @xmath81 , @xmath262 ) . the simulations include gravity , pressure gradients and hydrodynamical shocks , but neglect the effects of radiative cooling ... | we present results of n - body / gasdynamical simulations designed to investigate the evolution of x - ray clusters in a flat , low - density ,-dominated cold dark matter ( cdm ) cosmogony . the simulations include self - gravity , pressure gradients and hydrodynamical shocks , but neglect radiative cooling . the avera... | we present results of n - body / gasdynamical simulations designed to investigate the evolution of x - ray clusters in a flat , low - density ,-dominated cold dark matter ( cdm ) cosmogony . the simulations include self - gravity , pressure gradients and hydrodynamical shocks , but neglect radiative cooling . the densi... |
astro-ph0503520 | i | low and intermediate mass stars with masses ranging from @xmath6 to @xmath7 m@xmath3 undergo dramatic changes in temperature and luminosity during their evolution . for example , the luminosity of the sun , which is located on the main sequence of the hertzprung - russell diagram , currently is 30 percent greater than ... | could develop at distances in the range 2 - 9 au in the environment of sub - giant or giant stars and in the far distant future in the environment of our own solar system . space astronomy missions , such as proposed for the terrestrial planet finder ( tpf ) and darwin , that focus on searches for signatures of life on... | we present some new ideas about the possibility of life developing around sub - giant and red giant stars . our study concerns the temporal evolution of the habitable zone . the distance between the star and the habitable zone , as well as its width , increases with time as a consequence of stellar evolution . the habi... |
astro-ph0503520 | c | we have estimated the time transit of the habitable zone around evolved stars of initial mass 1.0 , 1.5 and 2.0 m@xmath3 from the time period after which a star moves off the main sequence until it reaches the point of the he flash . after the he flash , there is an additional potential phase for life during the period... | we present some new ideas about the possibility of life developing around sub - giant and red giant stars . for a 1 m star at the first stages of its post main - sequence evolution , the temporal transit of the habitable zone is estimated to be of several 10 years at 2 au and around 10 years at 9 au . under these circu... | we present some new ideas about the possibility of life developing around sub - giant and red giant stars . our study concerns the temporal evolution of the habitable zone . the distance between the star and the habitable zone , as well as its width , increases with time as a consequence of stellar evolution . the habi... |
astro-ph0201348 | i | we have detected polarized emission from aligned dust grains at 850 with the scuba polarimeter . these data reveal strong degrees of polarization ( up to 17% ) toward the ngc 2068 region , with higher polarization percentages detected toward regions of fainter total intensity . this depolarization effect has been obse... | the polarization pattern observed is not consistent with that expected for a field geometry defined by a single mean field direction . the presence of varying inclinations against the plane of the sky is consistent with the comparison of the 850 continuum emission to the optical emission from the palomar optical sky s... | we present submillimeter polarimetry at 850 toward the filamentary star - forming region associated with the reflection nebulosity ngc 2068 in orion b. these data were obtained using the james clerk maxwell telescope s scuba polarimeter . the polarization pattern observed is not consistent with that expected for a fie... |
0811.0158 | i | the main results of this paper can be summarized as follows : \(i ) between 2006 july 19 and 28 our photometric monitoring of the prototypical symbiotic star zand revealed the highest maximum of its brightness that has ever been recorded by the multicolor photometry ( @xmath2388.0 , fig . 1 ) . around the mid of au... | aftermag decline in mid - august , it kept its brightness at a high level of up to 2007 january . during this period , rapid photometric variations withmag on the timescale of hours developed . simultaneously , high - velocity satellite components appeared on both sides of the h and h emission line profiles . they be... | we present the development of the collimated bipolar jets from the symbiotic prototype zand that appeared and disappeared during its 2006 outburst . we monitored the outburst with the optical high - resolution spectroscopy and multicolor photometry . in 2006 july zand reached its historical maximum at . aftermag declin... |
astro-ph0107562 | i | low mass x - ray binaries ( lmxbs ) can be divided into black hole candidates ( bhcs ) and neutron star lmxbs . the accretion process in these lmxbs can be studied through the timing properties of the associated x - ray emission ( see for an overview van der klis 2000 ) . the fourier power spectra of the neutron sta... | this work was triggered by recent results of a similar fit to the black hole candidates ( bhcs ) gx 3394 and cyg x1 by nowak in 2000 . we find that one to six lorentzians are needed to fit the power spectra of our two sources . we use our results to test the suggestions by , respectively , psaltis belloni and van der ... | we present the results of a multi lorentzian fit to the power spectra of two kilohertz qpo sources ; 4u 0614 + 09 and 4u 172834 . this work was triggered by recent results of a similar fit to the black hole candidates ( bhcs ) gx 3394 and cyg x1 by nowak in 2000 . we find that one to six lorentzians are needed to fit... |
astro-ph0107562 | c | the use of exactly the same fit function for both 4u 172834 and 4u 0614 + 09 shows the similar timing behaviour of these two atoll sources ( see 3 ) . especially the frequencies and the @xmath15 values are almost identical . this similarity is quite remarkable , as the x ray luminosity is about a factor 5 larger for ... | the use of exactly the same fit function reveals that the timing behaviour of 4u 0614 + 09 and 4u 172834 is almost identical at luminosities which are about a factor 5 different . as the characteristic frequency of the lorentzians we find , that when the two kilohertz qpos are clearly present , the low frequency part ... | we present the results of a multi lorentzian fit to the power spectra of two kilohertz qpo sources ; 4u 0614 + 09 and 4u 172834 . this work was triggered by recent results of a similar fit to the black hole candidates ( bhcs ) gx 3394 and cyg x1 by nowak in 2000 . we find that one to six lorentzians are needed to fit... |
1205.1426 | c | using the unique capabilities of the vla vhf system , we have developed a multi - scale approach to the spectral analysis of tec gradients . probing a wide range of spatial scales and amplitudes , we have identified both plasmaspheric and ionospheric waves present during a @xmath14 hour observation during the night of ... | ae and indices and gps tec data indicate that during the observations , there were low levels of geomagnetic activity accompanied by somewhat localized depletions in ionospheric density . thus , the observed plasmaspheric disturbance may be part of a flow triggered by these ionospheric depletions , likely associated wi... | we present the results of a multi - scale analysis of tec fluctuations using a roughly five - hour observation of the bright radio source virgo a with the very large array ( vla ) at 74 mhz in its b configuration . our analysis combines data sensitive to fine - scale structure ( km and tecu in amplitude ) along the lin... |
1312.1585 | i | the path to finding exoplanets either inhabited or amenable for life as we know it on earth includes the detection in their atmospheres of chemical compounds such as @xmath2 , @xmath3 , @xmath4 , and @xmath5 , known as biomarkers ( schindler et al . 2000 , pavlov et al . 2000 , kaltenegger & traub 2007 , traub et al . ... | we explore such detectability with each of the three upcoming extremely large telescopes ( elts ) , i.e. gmt , tmt and e - elt , and high resolution spectrographs , assuming such instruments will be available in all elts . with these simulations we extend previous studies by taking into account atmospheric refraction ... | we present the results of simulations on the detectability of in the atmosphere of earth twins around nearby low mass stars using high resolution transmission spectroscopy . we explore such detectability with each of the three upcoming extremely large telescopes ( elts ) , i.e. gmt , tmt and e - elt , and high resolut... |
1312.1585 | r | using the simulations described above , we have investigated a series of questions pertaining the successful ground - based detection of @xmath0 in the atmosphere of an earth twin around a nearby star . those questions include the optimal spectral resolution of the observations , the limitations imposed by the relative... | we present the results of simulations on the detectability of in the atmosphere of earth twins around nearby low mass stars using high resolution transmission spectroscopy . in addition , our simulations show that , when accounting for typical noise levels associated to observations in the optical and near - infrared ,... | we present the results of simulations on the detectability of in the atmosphere of earth twins around nearby low mass stars using high resolution transmission spectroscopy . we explore such detectability with each of the three upcoming extremely large telescopes ( elts ) , i.e. gmt , tmt and e - elt , and high resolut... |
1312.1585 | c | we have carried out detailed feasibility studies to probe molecular oxygen in the atmosphere of an earth - analogue orbiting m - dwarfs with future instruments to be mounted on upcoming elts . in our simulations , we factored in the stellar spectra for different spectral types , the telluric spectrum of the earth , dif... | we conclude that , unless unpredicted instrumental limitations arise , the implementation of pre - slit optics such as image slicers appear to be key to significantly improve the yield of this particular science case . however , even in the most optimistic cases , we conclude that the detection of in the atmosphere of ... | we present the results of simulations on the detectability of in the atmosphere of earth twins around nearby low mass stars using high resolution transmission spectroscopy . we explore such detectability with each of the three upcoming extremely large telescopes ( elts ) , i.e. gmt , tmt and e - elt , and high resolut... |
0902.3637 | i | given a multiset @xmath4 of @xmath5 positive integers , a word on @xmath4 is a sequence @xmath6 that reorders the elements in @xmath4 . when @xmath7:=\{1,\dots , n\}$ ] the word is a permutation . a pair @xmath8 is called an _ inversion _ of @xmath9 if @xmath10 and @xmath11 . one well - known statistic on words and per... | we propose a major index statistic on 01-fillings of moon polyominoes which , when specialized to certain shapes , reduces to the major index for permutations and set partitions . crossings ) for permutations ( resp . set partitions ) . hence our result generalizes the classical equidistribution results for the permuta... | we propose a major index statistic on 01-fillings of moon polyominoes which , when specialized to certain shapes , reduces to the major index for permutations and set partitions . we consider the set of all 01-fillings of a moon polyomino with given column sum whose empty rows are , and prove that this major index has ... |
0705.1358 | c | in the above we have proposed two experiments on the measurement of the difference casimir force acting between a metal coated sphere and a semiconductor with different charge carrier densities . one of these experiments is based on the formation of a special patterned si plate , two sections of which have charge carri... | we propose two novel experiments on the measurement of the casimir force acting between a gold coated sphere and semiconductor plates with markedly different charge carrier densities . in the first of these experiments a patterned si plate is used which consists of two sections of different dopant densities and oscilla... | we propose two novel experiments on the measurement of the casimir force acting between a gold coated sphere and semiconductor plates with markedly different charge carrier densities . in the first of these experiments a patterned si plate is used which consists of two sections of different dopant densities and oscilla... |
1206.2390 | i | one of the first wavelets ever considered was the mexican hat ( see figure [ mexican ] ) , which is @xmath3 the mexican hat function @xmath4 , and its fourier transform @xmath5 . ] the mexican hat function @xmath4 , and its fourier transform @xmath5 . ] morlet @xcite generated the mexican hat system @xmath6 and ap... | we prove a sufficient condition for frame - type wavelet series in , the hardy space , and . bijectivity of the wavelet frame operator acting on hardy space is established with the help of new frequency - domain estimates on the caldern zygmund constants of the frame kernel . | we prove a sufficient condition for frame - type wavelet series in , the hardy space , and . for example , functions in these spaces are shown to have expansions in terms of the mexican hat wavelet , thus giving a strong answer to an old question of meyer . bijectivity of the wavelet frame operator acting on hardy s... |
1307.4912 | i | the ray - singer conjecture has been formulated in the seminal paper of ray and singer @xcite and proved independently by cheeger @xcite and mller @xcite for unitary representations . its importance stems from the fact that as in the atiyah - singer index theorem , it equates analytic with combinatorial quantities , th... | we prove that refined analytic torsion on a manifold with boundary is an analytic section of the determinant line bundle over the representation variety . as a fundamental application we establish a gluing formula for refined analytic torsion on connected components of the complex representation space which contain a u... | we prove that refined analytic torsion on a manifold with boundary is an analytic section of the determinant line bundle over the representation variety . as a fundamental application we establish a gluing formula for refined analytic torsion on connected components of the complex representation space which contain a u... |
1603.02707 | i | this article is about random _ lozenge tilings _ , which are tilings of domains on the regular triangular grid by rhombuses of three types ( see figures [ fig_hex ] , [ fig_trap ] , [ fig_covered_domains ] , [ fig_not_covered_domain ] , [ fig_gt_tiling ] ) , and which can be identified with dimers , discrete stepped su... | we prove that the asymptotic of the bulk local statistics in models of random lozenge tilings is universal in the vicinity of straight boundaries of the tiled domains . the result applies to uniformly random lozenge tilings of large polygonal domains on triangular lattice and to the probability measures describing the ... | we prove that the asymptotic of the bulk local statistics in models of random lozenge tilings is universal in the vicinity of straight boundaries of the tiled domains . the result applies to uniformly random lozenge tilings of large polygonal domains on triangular lattice and to the probability measures describing the ... |
math0101174 | i | the winterbottom theory @xcite gives a phenomenological prediction for the equilibrated shapes of small ( that is disregarding gravitation ) crystal particles placed on solid substrates . the notion of equilibrium comes on two levels : \(i ) as far as the bulk properties are considered , both the particle and the va... | we provide a rigorous microscopic derivation of the thermodynamic description of equilibrium crystal shapes in the presence of a substrate , first studied by winterbottom . we consider finite range ferromagnetic ising models with pair interactions in dimensions greater or equal to , and model the substrate by a finite ... | we provide a rigorous microscopic derivation of the thermodynamic description of equilibrium crystal shapes in the presence of a substrate , first studied by winterbottom . we consider finite range ferromagnetic ising models with pair interactions in dimensions greater or equal to , and model the substrate by a finite ... |
0906.2313 | i | the casimir effect @xcite is not only a field witnessing rapid experimental as well as theoretical progress , it also continues to offer surprising new features . the casimir effect derives its fascination from the fact that it originates from quantum fluctuations of the radiation field or of the charge distribution on... | we investigate the temperature dependence of the casimir force between an inclined semi - infinite plate above an infinite plate in dimensions using the worldline formalism . whereas the high - temperature behavior is always found to be linear in in accordance with dimensional - reduction arguments , unlike the case of... | we provide further evidence for the nontrivial interplay between geometry and temperature in the casimir effect . we investigate the temperature dependence of the casimir force between an inclined semi - infinite plate above an infinite plate in dimensions using the worldline formalism . whereas the high - temperature ... |
1310.4553 | c | we explored the metallicity and temperature sensitivities of colors created from nine wfc3/uvis filters aboard the hst using dartmouth isochrones and kurucz atmospheres models . the theoretical isochrone colors were tested and calibrated against observations of five well studied clusters . we found that ( f390w f555w ... | we quantified and calibrated the metallicity and temperature sensitivities of colors derived from nine wide field camera 3 ( wfc3 ) filters aboard the hubble space telescope ( hst ) using dartmouth isochrones and kurucz atmospheres models . the theoretical isochrone colors were tested and calibrated against observation... | we quantified and calibrated the metallicity and temperature sensitivities of colors derived from nine wide field camera 3 ( wfc3 ) filters aboard the hubble space telescope ( hst ) using dartmouth isochrones and kurucz atmospheres models . the theoretical isochrone colors were tested and calibrated against observation... |
0903.2403 | c | we have measured the @xmath0-hadron production cross section in @xmath35 and @xmath317 decays using the cdf ii detector at the fermilab tevatron . the muon plus charm hadron decay signature was acquired using a dedicated trigger that takes advantage of the muon signature as well as the long @xmath4 lifetime . by select... | we report a measurement of the production cross section for hadrons in collisions at . using a data sample derived from an integrated luminosity of collected with the upgraded collider detector ( cdfii ) at the fermilab tevatron , the differential cross sections are found to be in good agreement with recent measurement... | we report a measurement of the production cross section for hadrons in collisions at . using a data sample derived from an integrated luminosity of collected with the upgraded collider detector ( cdfii ) at the fermilab tevatron , we analyze hadrons , , partially reconstructed in the semileptonic decay mode . our measu... |
0912.2655 | r | figs . [ fig - specmapg324 ] to [ fig - specmapg330 ] show spectral maps of the cs(2@xmath11 ) , cs(3@xmath12 ) , c@xmath6s(3@xmath12 ) , sio(2@xmath11 ) , sio(3@xmath12 ) , ch@xmath2oh(3@xmath4 ) , and ch@xmath2oh(2@xmath46 ) line emission observed toward g324.201 + 0.119 , g328.307 + 0.423 , g329.337 + 0.147 and g33... | the cs profiles show two distinct emission components : a bright component , with line widths of typically 5 ( fwhm ) , and a weaker and wider velocity component , which extends up to typically from the ambient cloud velocity . the sio profiles also show emission from both components , but the intensity of the pedestal... | we report molecular line and dust continuum observations , made with the sest telescope , towards four young high - mass star forming regions associated with highly luminous ( ) iras sources ( 15290 - 5546 , 15502 - 5302 , 15567 - 5236 and 16060 - 5146 ) . molecular emission was mapped in three lines of cs ( j=2 , 3 an... |
0912.2655 | c | [ fig - sed ] shows , for each of the 4 sources , the spectral energy distribution ( sed ) from 12 @xmath89 m to 1.2 mm . in this wavelength range the emission is mainly due to thermal dust emission . the flux densities at 12 , 25 , 60 and 100 correspond to iras data , and those at 8.3 , 12.1 , 14.7 and 21.3 correspo... | molecular emission was mapped in three lines of cs ( j=2 , 3 and 5 ) , two lines of sio ( j=2 and 3 ) , two rotational transitions of choh ( j=3 and ) , and in the cs(j=3 ) line . in addition , single spectra at the peak position were taken in the co(j=1 ) ,co(j=1 ) and co(j=1 ) lines . we find that the abundances of c... | we report molecular line and dust continuum observations , made with the sest telescope , towards four young high - mass star forming regions associated with highly luminous ( ) iras sources ( 15290 - 5546 , 15502 - 5302 , 15567 - 5236 and 16060 - 5146 ) . molecular emission was mapped in three lines of cs ( j=2 , 3 an... |
0912.2655 | i | we undertook molecular line observations in several species and transitions and dust continuum observations , both made using sest , towards four young high - mass star forming regions associated with highly luminous iras point sources with colors of uc hii regions and cs(2@xmath11 ) emission . these are thought to be ... | we report molecular line and dust continuum observations , made with the sest telescope , towards four young high - mass star forming regions associated with highly luminous ( ) iras sources ( 15290 - 5546 , 15502 - 5302 , 15567 - 5236 and 16060 - 5146 ) . we find that the luminous star forming regions are associated w... | we report molecular line and dust continuum observations , made with the sest telescope , towards four young high - mass star forming regions associated with highly luminous ( ) iras sources ( 15290 - 5546 , 15502 - 5302 , 15567 - 5236 and 16060 - 5146 ) . molecular emission was mapped in three lines of cs ( j=2 , 3 an... |
1001.1747 | i | over the past decade , x - ray observations of galaxy clusters have clearly illustrated the immense energies associated with interactions between active galactic nuclei ( agns ) and their environments . for example , discoveries of x - ray cavities associated with agn radio - emitting ` relic bubbles ' ( _ e.g. _ @xcit... | we report on a series of three - dimensional magnetohydrodynamic simulations of active galactic nucleus ( agn ) jet propagation in realistic models of magnetized galaxy clusters . we are primarily interested in the details of energy transfer between jets and the intracluster medium ( icm ) to help clarify what role suc... | we report on a series of three - dimensional magnetohydrodynamic simulations of active galactic nucleus ( agn ) jet propagation in realistic models of magnetized galaxy clusters . we are primarily interested in the details of energy transfer between jets and the intracluster medium ( icm ) to help clarify what role suc... |
1210.3273 | i | the icecube neutrino telescope at the south pole has successfully been completed in december 2010 . icecube is the most sensitive telescope to date to search for high - energy neutrino sources , whose existence is intimately related to the acceleration of hadrons and their interaction in the environment of their accele... | we report on searches for neutrino sources at energies above 200 gev in the northern sky of the galactic plane , using the data collected by the south pole neutrino telescope icecube and amanda . the analyses presented here are : a scan for point sources within the galactic plane ; a search optimized for multiple and ... | we report on searches for neutrino sources at energies above 200 gev in the northern sky of the galactic plane , using the data collected by the south pole neutrino telescope icecube and amanda . the galactic region considered in this work includes the local arm towards the cygnus region and our closest approach to th... |
astro-ph0208517 | i | some of the most dramatic phenomena of astrophysics , such as quasars and powerful radio galaxies , are most likely powered by accretion onto supermassive black holes ( smbhs ) . nevertheless , smbhs appear to spend most of their time in a remarkably quiescent state . smbhs are embedded in the relatively dense environm... | we consider inviscid accretion flows with a spherically symmetric density distribution at the outer boundary , but with spherical symmetry broken by the introduction of a small , latitude - dependent angular momentum . our main result is that the properties of the accretion flow do not depend as much on the outer bound... | we report on the first phase of our study of slightly rotating accretion flows onto black holes . we consider inviscid accretion flows with a spherically symmetric density distribution at the outer boundary , but with spherical symmetry broken by the introduction of a small , latitude - dependent angular momentum . we ... |
astro-ph0208517 | r | our numerical models are specified by several parameters . the length scale is determined by the black hole radius in units of the bondi radius , @xmath101 . our second parameter is the adiabatic index , @xmath141 . the last parameter ( or a function rather ) is the angular momentum at the outer radial boundary , @xmat... | our results show one way in which the mass accretion rate of slightly rotating gas can be significantly reduced compared to the accretion of non - rotating gas ( i.e. , the bondi rate ) , and set the stage for calculations that will take into account the transport of angular momentum and energy . = = = 1=1=0pt = 2=2... | we report on the first phase of our study of slightly rotating accretion flows onto black holes . we consider inviscid accretion flows with a spherically symmetric density distribution at the outer boundary , but with spherical symmetry broken by the introduction of a small , latitude - dependent angular momentum . we ... |
1601.02690 | i | laboratory measurements of very weak atomic transitions that violate the usual parity selection rules are a means of determining the weak force at low collision energies @xcite . the component of this electric dipole transition moment @xmath0 that is induced by the weak - force coupling between nucleons has become of ... | field to a region in which the static fields are uniform and well - characterized . we carry out detailed numerical simulations of the field modes , and analyze the expected magnitude of statistical and systematic limits to the measurement of this transition amplitude in atomic cesium . the application of this techniqu... | we report our detailed analysis of a table - top system for the measurement of the weak - force - induced electric dipole moment of a ground state hyperfine transition carried out in an atomic beam geometry . we describe an experimental configuration of conductors for application of orthogonal r.f . and static electri... |
1403.5306 | i | intermediate mass black hole ( imbh ) binary systems represent a potential strong source of gravitational radiation accessible to ground - based interferometric detectors such as the laser interferometer gravitational - wave observatory ( ligo ) @xcite and virgo @xcite . although yet to be discovered , binary systems... | we report results from a search for gravitational waves produced by perturbed intermediate mass black holes ( imbh ) in data collected by ligo and virgo between 2005 and 2010 . the search was sensitive to astrophysical sources that produced damped sinusoid gravitational wave signals , also known as ringdowns , with fre... | we report results from a search for gravitational waves produced by perturbed intermediate mass black holes ( imbh ) in data collected by ligo and virgo between 2005 and 2010 . the search was sensitive to astrophysical sources that produced damped sinusoid gravitational wave signals , also known as ringdowns , with fre... |
1403.5306 | i | this paper presents the results of the search for ringdown gravitational waves in data collected by ligo and virgo between 2005 and 2010 . no significant gravitational wave candidate was identified . we place upper limits on the merger rates of non - spinning imbh binaries as well as on the rates of ringdowns from pert... | no significant gravitational wave candidate was detected . we also report a rate upper limit for ringdown waveforms from perturbed imbhs , radiating 1% of their mass as gravitational waves in the fundamental , , oscillation mode , that is nearly three orders of magnitude more stringent than previous results . | we report results from a search for gravitational waves produced by perturbed intermediate mass black holes ( imbh ) in data collected by ligo and virgo between 2005 and 2010 . the search was sensitive to astrophysical sources that produced damped sinusoid gravitational wave signals , also known as ringdowns , with fre... |
1109.4167 | i | fossil groups ( fgs ) are systems dominated by a single , giant elliptical galaxy , yet their x - ray emission indicates a deeper cluster - scale gravitational potential . they are generally defined as systems with a @xmath1 = 2 magnitude difference between the first and second rank galaxies within @xmath2 , and they h... | we report the discovery of 12 new fossil groups of galaxies , systems dominated by a single giant elliptical galaxy and cluster - scale gravitational potential , but lacking the population of bright galaxies typically seen in galaxy clusters . these fossil groups ( fgs ) , selected from the maxbcg optical cluster catal... | we report the discovery of 12 new fossil groups of galaxies , systems dominated by a single giant elliptical galaxy and cluster - scale gravitational potential , but lacking the population of bright galaxies typically seen in galaxy clusters . these fossil groups ( fgs ) , selected from the maxbcg optical cluster catal... |
1109.4167 | i | fossil groups present a puzzle to current theories of structure formation . despite the low number of bright galaxies , their high velocity dispersions ( e.g. , * ? ? ? * ) and high gas temperatures seem to indicate cluster - like gravitational potential wells . there have been very few fgs with good quality x - ray da... | , we determine the x - ray luminosity , temperature , and hydrostatic mass , which do not deviate significantly from expectations for normal systems , spanning a range typical of rich groups and poor clusters of galaxies . a small number of detected fgs are morphologically irregular , possibly due to past mergers , int... | we report the discovery of 12 new fossil groups of galaxies , systems dominated by a single giant elliptical galaxy and cluster - scale gravitational potential , but lacking the population of bright galaxies typically seen in galaxy clusters . these fossil groups ( fgs ) , selected from the maxbcg optical cluster catal... |
1507.03656 | i | the most metal - poor stars in the galactic halo carry important information about the formation and early evolution of the conditions in the early universe , as well as in the assembly of the milky way . in particular , ultra metal - poor ( ump ; @xmath0$]$ ] = @xmath11 , where @xmath12 is the number density of atoms ... | we report the discovery of one extremely metal - poor ( emp ;$] ) and one ultra metal - poor ( ump ;$] ) star selected from the sdss / segue survey . these stars were identified as emp candidates based on their medium - resolution ( ) spectra , and were followed - up with high - resolution ( ) spectroscopy with the mag... | we report the discovery of one extremely metal - poor ( emp ;$] ) and one ultra metal - poor ( ump ;$] ) star selected from the sdss / segue survey . these stars were identified as emp candidates based on their medium - resolution ( ) spectra , and were followed - up with high - resolution ( ) spectroscopy with the mag... |
1507.03656 | c | there are many reasons why observations of new stars in the metallicity range @xmath6}}}<-3.5 $ ] are important . these include a proper description of the low - metallicity tail of the galactic halo mdf , as well as the nature of the progenitor populations of ump stars . below we show a comparison between the abundanc... | the models were matched with ump stars found in the literature , together with one of the program stars ( ) , with}}}=-4.34 $ ] . from fitting their abundances , we find that the supernovae progenitors , for stars where carbon and nitrogen are measured , had masses ranging from to , and explosion energies from to . the... | we report the discovery of one extremely metal - poor ( emp ;$] ) and one ultra metal - poor ( ump ;$] ) star selected from the sdss / segue survey . these stars were identified as emp candidates based on their medium - resolution ( ) spectra , and were followed - up with high - resolution ( ) spectroscopy with the mag... |
1507.03656 | c | in this work we presented the high - resolution abundance analysis of two stars selected from the sdss / segue survey , with @xmath6}}}=-3.64 $ ] and @xmath6}}}=-4.34 $ ] . a detailed chemical abundance analysis reveals that these stars show the expected behavior of stars in the same metallicity range . the addition of... | we also provide new insights on the formation of the ump stars , based on comparison with a new set of theoretical models of supernovae nucleosynthesis . in addition , we are able to reproduce the different cno abundance patterns found in ump stars with a single progenitor type , by varying its mass and explosion energ... | we report the discovery of one extremely metal - poor ( emp ;$] ) and one ultra metal - poor ( ump ;$] ) star selected from the sdss / segue survey . these stars were identified as emp candidates based on their medium - resolution ( ) spectra , and were followed - up with high - resolution ( ) spectroscopy with the mag... |
1207.1244 | c | we have reported the binary microlensing event ogle-2007-blg-514 . this is an extremely high - magnification event ( @xmath0 ) , which enabled follow - up observations of this event . from the binary lens model search , we found that the lens has a stellar binary mass ratio @xmath188 . the well - known degeneracies of ... | the binary lens model that includes the effects of parallax ( known orbital motion of the earth ) and orbital motion of the lens yields a binary lens mass ratio of and a projected separation of in units of the einstein radius . the parallax parameters allow us to determine the lens distance kpc and total mass ; this le... | we report the extremely high magnification ( ) binary microlensing event ogle-2007-blg-514 . we obtained good coverage around the double peak structure in the light curve via follow - up observations from different observatories . the binary lens model that includes the effects of parallax ( known orbital motion of the... |
astro-ph0401353 | i | we have described our deep redshift survey of the goods - n region using deimos , the result of which is a catalog of photometry , astrometry , redshifts and redshift quality assessments for 1440 confirmed galaxies / agn and stars in the @xmath7 goods - n region . this sample is 53% complete to a limiting magnitude of ... | we report the results of an extensive imaging and spectroscopic survey in the goods - north field completed using deimos on the keck ii telescope . observations of 2018 targets in a magnitude - limited sample of 2911 objects to yield secure redshifts for a sample of 1440 galaxies and agn plus 96 stars . in addition to ... | we report the results of an extensive imaging and spectroscopic survey in the goods - north field completed using deimos on the keck ii telescope . observations of 2018 targets in a magnitude - limited sample of 2911 objects to yield secure redshifts for a sample of 1440 galaxies and agn plus 96 stars . in addition to ... |
0902.1009 | i | it is well understood that the resistance minimum observed in metallic alloys diluted with small amount of magnetic impurities ( e.g. , au - fe or cu - fe ) is caused by the spin - spin scattering between conduction electrons and local moments @xcite . at temperatures approaching absolute zero , the magnetic moments of... | we review the current status of andreev reflection spectroscopy on the heavy fermions , mostly focusing on the case of cecoin , a heavy - fermion superconductor with a critical temperature of 2.3 k. this is a well - established technique to investigate superconducting order parameters via measurements of the differenti... | we review the current status of andreev reflection spectroscopy on the heavy fermions , mostly focusing on the case of cecoin , a heavy - fermion superconductor with a critical temperature of 2.3 k. this is a well - established technique to investigate superconducting order parameters via measurements of the differenti... |
0809.2692 | i | the basic structure of our milky way galaxy seems clear : a thin disk of young stars , gas and dust circles the center quietly , immersed within a thicker disk of older stars . both disks sit inside a nearly spherical halo of very old , metal - poor stars which do not share the overall rotation of the disks . surroundi... | we search for stars with proper motions in a set of twenty deep subaru images , covering about 0.28 square degrees to a depth of , taken over a span of six years . in this paper , we describe in detail our reduction and techniques to identify moving objects . | we search for stars with proper motions in a set of twenty deep subaru images , covering about 0.28 square degrees to a depth of , taken over a span of six years . in this paper , we describe in detail our reduction and techniques to identify moving objects . we present a first sample of 99 stars with motions of high s... |
nucl-th9606043 | i | in its original inception supersymmetry pertains to a system of fermions and bosons exhibiting an invariance with respect to exchange between these two classes of particles . it may therefore be somewhat surprising to discover that a fermion system on its own can also exhibit _ dynamical supersymmetry_. states with eve... | this supersymmetry without bosons " is constructed by application of a recently introduced boson - fermion dyson mapping from a fermion space to a space comprised of collective bosons and ideal fermions . in some algebraic fermion models of nuclear structure , particular hamiltonians may lead to collective spectra of ... | we show that a dynamical supersymmetry can appear in a purely fermionic system . this supersymmetry without bosons " is constructed by application of a recently introduced boson - fermion dyson mapping from a fermion space to a space comprised of collective bosons and ideal fermions . in some algebraic fermion models ... |
0802.0976 | i | the interplay of quantum phase coherence and repeated random scattering is at the origin of many effects in mesoscopic physics.@xcite these effects include weak localization and universal conductance fluctuations , both of which are small but fundamental corrections with respect to the conductance obtained from drude -... | we show that anderson localization in quasi - one dimensional conductors with ballistic electron dynamics , such as an array of ballistic chaotic cavities connected via ballistic contacts , can be understood in terms of classical electron trajectories only . at large length scales , an exponential proliferation of traj... | we show that anderson localization in quasi - one dimensional conductors with ballistic electron dynamics , such as an array of ballistic chaotic cavities connected via ballistic contacts , can be understood in terms of classical electron trajectories only . at large length scales , an exponential proliferation of traj... |
1611.04590 | i | the cold dark matter paradigm ( @xmath2cdm ) provides a remarkably good description of cosmology and astrophysics . however , observations connected with small scales might be in tension with this framework . in particular , structure formation simulations to date assuming @xmath2cdm predict a greater number of galaxy ... | we treat the dark matter as a quasi - degenerate self - gravitating fermi gas and calculate its density profile assuming hydrostatic equilibrium . such sub - kev thermal dark matter would be excluded by free streaming bounds , the constraints are ameliorated in models with dark matter at lower temperature than conventi... | we show that fermi repulsion can lead to cored density profiles in dwarf galaxies for sub - kev fermionic dark matter . we treat the dark matter as a quasi - degenerate self - gravitating fermi gas and calculate its density profile assuming hydrostatic equilibrium . we find that suitable dwarf galaxy cores of size pc ... |
1611.04590 | c | a ( quasi ) degenerate fermi gas in dwarf galaxies can alter small scale structure formation . this can provide an elegant and minimal solution to the core - cusp problem . using the criterion that cores of order a few 100 pc are required to reproduce the observations of dwarf galaxies , we have shown that suitable dwa... | we show that fermi repulsion can lead to cored density profiles in dwarf galaxies for sub - kev fermionic dark matter . we find that suitable dwarf galaxy cores of size pc can be achieved for fermion dark matter with mass in the range 70 ev 400 ev . while in conventional dark matter scenarios , | we show that fermi repulsion can lead to cored density profiles in dwarf galaxies for sub - kev fermionic dark matter . we treat the dark matter as a quasi - degenerate self - gravitating fermi gas and calculate its density profile assuming hydrostatic equilibrium . we find that suitable dwarf galaxy cores of size pc ... |
1109.4444 | i | the gaussian free field is widely considered to be a universal object describing the flucutations of heights of random surfaces . previous work has rigorously shown this to be the case in specific models ( @xcite,@xcite ) . in this paper , we show that if an interlacing particle system in two dimensions can be describe... | we show that if an interlacing particle system in a two - dimensional lattice is a determinantal point process , and the correlation kernel can be expressed as a double integral with certain technical assumptions , then the moments of the fluctuations of the height function converge to that of the gaussian free field .... | we show that if an interlacing particle system in a two - dimensional lattice is a determinantal point process , and the correlation kernel can be expressed as a double integral with certain technical assumptions , then the moments of the fluctuations of the height function converge to that of the gaussian free field .... |
1611.05281 | i | the structure and success of general relativity have lead us to the believe that the spin-2 graviton field mediates quantum gravitational interactions ; but to date this believe has eluded experimental detection . furthermore , the quantum limit of general relativity fails to renormalize properly forcing us to further ... | we show that the renormalizable yang mills coupled to matter and the higgs field fits all the experimentally observed differential cross sections known in nature . each so(4 ) generator in quantum gravitodynamics does not commute with the dirac gamma matrices . the contributions from these new terms yield differential ... | we show that the renormalizable yang mills coupled to matter and the higgs field fits all the experimentally observed differential cross sections known in nature . this extended standard model reproduces the experimental gravitational differential cross sections without resorting to the graviton field and instead by ex... |
1307.5066 | i | the accelerated expansion of the universe @xcite is commonly attributed to a negative pressure component dubbed dark energy , making up approximately 73% of the energy content of the universe @xcite . the nature of dark energy remains a mystery , though it can be probed through its effect on the growth of structure ove... | we simulate the performance of a new type of instrument , a superconducting multi - object spectrograph ( supermos ) , that uses microwave kinetic inductance detectors ( mkids ) . we compare our results against a simultaneous simulation of lsst observations . in three years on a dedicated 4m - class telescope , giga- c... | we simulate the performance of a new type of instrument , a superconducting multi - object spectrograph ( supermos ) , that uses microwave kinetic inductance detectors ( mkids ) . mkids , a new detector technology , feature good qe in the uvoir , can count individual photons with microsecond timing accuracy and , like ... |
1307.5066 | c | several dark energy probes rely on photometric redshift estimates that are accurate and exhibit little bias . the des , lsst , euclid , kids and other wide field imaging experiments will survey much of the sky in the usual photometric bands , but to fully realize their potential , the photo-@xmath0 scatter and biases m... | the performance of giga- , a supermos designed for wide field imaging follow - up observations , is evaluated using simulated observations of the cosmos mock catalog with an array of 100,000 r=e/e=30 mkid pixels . giga- would provide redshifts for galaxies up to with magnitudes , with accuracy.03 for the whole sample ,... | we simulate the performance of a new type of instrument , a superconducting multi - object spectrograph ( supermos ) , that uses microwave kinetic inductance detectors ( mkids ) . mkids , a new detector technology , feature good qe in the uvoir , can count individual photons with microsecond timing accuracy and , like ... |
hep-ph0202195 | i | it is generally accepted that the theory of strong interactions , qcd , should describe the observed phenomenon of confinement : colored objects like quarks and gluons occur only in hadrons . a possible route for gaining more understanding of this phenomenon is the study of the infrared behavior of qcd green s function... | popov quantization on a four - torus . we verify that analytically two power - like solutions in the very far infrared seem possible . however , only one of these solutions can be matched to a numerical solution for non - vanishing momenta . for a bare ghost - gluon vertex this implies that the gluon propagator is onl... | we solve a truncated system of coupled dyson schwinger equations for the gluon and ghost propagators in su( ) yang mills theories in faddeev popov quantization on a four - torus . this compact space - time manifold provides an efficient mean to solve the gluon and ghost dyson schwinger equations without any angular... |
1611.03349 | i | since veselago @xcite first pondered creating artificial materials to induce unorthodox physical properties in 1968 , metamaterials have been at the forefront of interdisciplinary research to develop novel applications . after the turn of the new millennium , groundbreaking progresses on invisibility and cloaking @xcit... | we study a bipartite linear chain constituted by spherical metallic nanoparticles , where each nanoparticle supports a localized surface plasmon . the near - field dipolar interaction between the localized surface plasmons gives rise to collective plasmons , which are extended over the whole nanoparticle array . we fin... | we study a bipartite linear chain constituted by spherical metallic nanoparticles , where each nanoparticle supports a localized surface plasmon . the near - field dipolar interaction between the localized surface plasmons gives rise to collective plasmons , which are extended over the whole nanoparticle array . we der... |
1408.5339 | i | monotone trajectories describing the evolution of state(s ) over time appear widely in scientific studies . the most widely studied are probably growth of organisms such as humans or plants ( milani , 2000 ; erickson , 1976 ; silk and erickson , 1979 ) . there are many parametric models for describing the features of g... | we study a class of nonlinear nonparametric inverse problems . specifically , we propose a nonparametric estimator of the dynamics of a monotonically increasing trajectory defined on a finite time interval . under suitable regularity conditions , we prove consistency of the proposed estimator and show that in terms of-... | we study a class of nonlinear nonparametric inverse problems . specifically , we propose a nonparametric estimator of the dynamics of a monotonically increasing trajectory defined on a finite time interval . under suitable regularity conditions , we prove consistency of the proposed estimator and show that in terms of-... |
cond-mat0203414 | i | low - energy physics of equilibrium systems with weakly interacting electrons is well understood both qualitatively and quantitatively . the relevant information about the equilibrium system is contained in one- and two - particle green functions , in particular in their behavior around the fermi energy . a number of r... | we study consequences of gauge invariance and charge conservation of an electron gas in a strong random potential perturbed by a weak electromagnetic field . we use quantum equations of motion and ward identities for one- and two - particle averaged green functions to establish exact relations between density and curre... | we study consequences of gauge invariance and charge conservation of an electron gas in a strong random potential perturbed by a weak electromagnetic field . we use quantum equations of motion and ward identities for one- and two - particle averaged green functions to establish exact relations between density and curre... |
1205.0188 | i | the systole of a metric space @xmath6 is the least length of a loop in @xmath6 which can not be contracted to a point . we will study extremal systolic problems on riemann surfaces , and specifically dyck s surface and its orientable genus-2 double cover . it turns out that there are three conformal types of genus... | we study extremal systolic problems on riemann surfaces , and specifically dyck s surface and its orientable genus-2 double cover . there are three conformal types of genus-2 surfaces that are significant for various problems of systolic extremality . we will denote them , , and . here is the bolza surface , is a surfa... | we study extremal systolic problems on riemann surfaces , and specifically dyck s surface and its orientable genus-2 double cover . there are three conformal types of genus-2 surfaces that are significant for various problems of systolic extremality . we will denote them , , and . here is the bolza surface , is a surfa... |
1603.08259 | c | we have studied how to engineer holographic models with features of a high temperature superconductor phase diagram . we introduced a field @xmath1 in the bulk which provides a tunable doping " parameter @xmath127 in the boundary theory . by designing how this field changes the effective masses of other order paramete... | we study how to engineer holographic models with features of a high temperature superconductor phase diagram . we introduce a field in the bulk which provides a tunable doping " parameter in the boundary theory . by designing how this field changes the effective masses of other order parameter fields , desired phase d... | we study how to engineer holographic models with features of a high temperature superconductor phase diagram . we introduce a field in the bulk which provides a tunable doping " parameter in the boundary theory . by designing how this field changes the effective masses of other order parameter fields , desired phase d... |
1201.5910 | i | free electrons outside liquid helium can be trapped at the vapor - liquid interface owing to the attractive polarization potential above the surface and a repulsive barrier at the surface , which prevents electrons from entering the liquid . @xcite as a result , the electron motion perpendicular to the helium surface i... | we study nonlinear inter - subband microwave absorption of electrons bound to the liquid helium surface . already for a comparatively low radiation intensity , resonant absorption due to transitions between the two lowest subbands is accompanied by electron overheating . the overheating results in a significant populat... | we study nonlinear inter - subband microwave absorption of electrons bound to the liquid helium surface . already for a comparatively low radiation intensity , resonant absorption due to transitions between the two lowest subbands is accompanied by electron overheating . the overheating results in a significant populat... |
astro-ph0503477 | i | based on the archival data of xmm newton observations , we studied the population of point - like sources in the field of the smc . the total area of the survey is @xmath0 sq.degr . with the limiting sensitivity of @xmath14 erg / s/@xmath2 ( fig.[fig : area ] ) , corresponding to the luminosity of @xmath203 erg / s at... | the total area of the survey is square degrees with the limiting sensitivity of erg / s/ , corresponding to the luminosity of erg / s at the smc distance . out of point the observed number of hmxbs is consistent with the prediction based on sfr estimates derived from the supernovae frequency and analysis of color - mag... | we study population of compact x - ray sources in the small magellanic cloud using the archival data of xmm - newton observatory . the total area of the survey is square degrees with the limiting sensitivity of erg / s/ , corresponding to the luminosity of erg / s at the smc distance . out of point sources detected in ... |
cond-mat9611226 | i | electrons moving on a lattice immersed in a magnetic field have attracted much attention due to their relevance to many physical problems . in particular , quantum interference ( qi ) effects between different electron paths in disordered electron systems have been a subject of intense study because they play an import... | these effects arise from the interference between phase factors associated with different electron paths connecting two distinct sites . for electrons confined on a square lattice , with and without disorder , an _ analytic field - dependent _ expression , valid in _ any dimension _ , for the magnetoconductance ( mc ) ... | we study quantum interference effects on the transition strength for strongly localized electrons hopping on two - dimensional ( 2d ) square and three - dimensional ( 3d ) cubic lattices in the presence of a magnetic field . these effects arise from the interference between phase factors associated with different elect... |
cond-mat9611226 | c | in closing we briefly address four issues . first , although relevant measurable quantities such as @xmath406 and @xmath407 are gauge - invariant , the transition amplitudes are gauge dependent . as an illustration , the transition amplitude will be @xmath69 [ eq . ( 12 ) ] if we use the landau gauge @xmath408 on a squ... | we study quantum interference effects on the transition strength for strongly localized electrons hopping on two - dimensional ( 2d ) square and three - dimensional ( 3d ) cubic lattices in the presence of a magnetic field . expressions for the tunneling probability , which determines the conductivity , between two _ a... | we study quantum interference effects on the transition strength for strongly localized electrons hopping on two - dimensional ( 2d ) square and three - dimensional ( 3d ) cubic lattices in the presence of a magnetic field . these effects arise from the interference between phase factors associated with different elect... |
hep-ph0002089 | i | within the standard model ( sm ) , @xmath4 violation is caused by a non - zero complex phase in the cabibbo - kobayashi - maskawa ( ckm ) quark mixing matrix @xcite . while the experimentally observed indirect @xmath4 violation in the neutral kaon system , @xmath18 , can be accommodated in the sm , it is still an open ... | we study rare exclusive decays based on the quark - level transition , where or , in the context of supersymmetric theories with minimal flavour violation . we present analytic expressions for various mixing matrices in the presence of new-violating phases , and examine their impact on observables involving and decays ... | we study rare exclusive decays based on the quark - level transition , where or , in the context of supersymmetric theories with minimal flavour violation . we present analytic expressions for various mixing matrices in the presence of new-violating phases , and examine their impact on observables involving and decays ... |
1206.3547 | r | we study first the case in which particles jump independently from state @xmath10 to @xmath7 and vice - versa , schematically : @xmath11 with rates that depend on the value of the heterogeneity parameter , @xmath12 . the probability @xmath13 for particle @xmath4 to be in state @xmath7 at time @xmath5 obeys the linear r... | we study stochastic particle systems made up of heterogeneous units . moreover , in the general framework of complexity science , systems very often can be modeled only at a stochastic level , since a complete knowledge of all the variables , the precise dynamics of the units and the interaction with the environment is... | we study stochastic particle systems made up of heterogeneous units . we introduce a general framework suitable to analytically study this kind of systems and apply it to two particular models of interest in economy and epidemiology . we show that particle heterogeneity can enhance or decrease the size of the collectiv... |
1206.3547 | c | in this work , we have analyzed the combined effect of stochasticity and heterogeneity in interacting - particle systems . we have presented a formulation of the problem in terms of master equations for the individual units , but extracted conclusions about the fluctuations of collective variables . we have developed a... | we introduce a general framework suitable to analytically study this kind of systems and apply it to two particular models of interest in economy and epidemiology . we show that particle heterogeneity can enhance or decrease the size of the collective fluctuations depending on the system , and that it is possible to in... | we study stochastic particle systems made up of heterogeneous units . we introduce a general framework suitable to analytically study this kind of systems and apply it to two particular models of interest in economy and epidemiology . we show that particle heterogeneity can enhance or decrease the size of the collectiv... |
1206.3547 | m | we have developed and used analytical tools based on an extension of van kampen s ansatz on the relative weight of the fluctuations compared to the mean value , suitable for systems with particle heterogeneity . we have included the details of this method in the supplementary information . in some cases , and in order ... | whether considering a population of cells , a group of people or an array of lasers ( to name just a few examples ) , one never finds two units which behave exactly in the same way . despite this general fact , quantitative modeling most often assumes identical units , since this condition seems necessary for having an... | we study stochastic particle systems made up of heterogeneous units . we introduce a general framework suitable to analytically study this kind of systems and apply it to two particular models of interest in economy and epidemiology . we show that particle heterogeneity can enhance or decrease the size of the collectiv... |
0910.0945 | i | sub - riemannian geometry is proved to play an important role in many applications , e.g. , in mathematical physics and control theory . sub - riemannian geometry enjoys major differences from the riemannian being a generalization of the latter at the same time , e.g. , geodesics may be singular , the hausdorff dimensi... | in particular , we prove that there is a strong connection between the conjugate loci and the number of geodesics . in the sub - lorentzian case , we describe the geodesics connecting two points on , and compare them with lorentzian ones . it turns out that the reachable sets for lorentzian and sub - lorentzian normal ... | we study sub - riemannian and sub - lorentzian geometry on the lie group and on its universal cover . in the sub - riemannian case we find the distance function and completely describe sub - riemannian geodesics on both and , connecting two fixed points . in particular , we prove that there is a strong connection betwe... |
astro-ph9905281 | i | cosmological n body simulations have become the basic tool to study the non linear stages of structure formation and evolution in the universe . in the least few years , the use of parallel computers has allowed simulations with an increasingly wide dynamical range and it is now possible to simulate boxes , with side... | we study the cluster mass function in mixed dark matter ( mdm ) models , using two cobe normalized simulations with and , and and , both with 2 massive s ( mdm1 and mdm2 , respectively ) . for the sake of comparison , we also simulate a cdm model with spectral index ( tcdm ) , also cobe normalized . are more clustered ... | we study the cluster mass function in mixed dark matter ( mdm ) models , using two cobe normalized simulations with and , and and , both with 2 massive s ( mdm1 and mdm2 , respectively ) . for the sake of comparison , we also simulate a cdm model with spectral index ( tcdm ) , also cobe normalized . we argue that , in ... |
1406.7081 | i | the layered organic conductor @xmath0(bedt - ttf)@xmath1i@xmath2 , an intensively investigated member of the ( bedt - ttf)@xmath1i@xmath2 family,@xcite recently enjoys renewed interest due to the presence of dirac cones in the low - energy band structure under high hydrostatic pressure ( above 15 kbar)@xcite or under u... | we study the collective modes of a low - energy continuum model of the quasi - two - dimensional electron liquid in a layer of the organic compound(bedt - ttf)i in a perpendicular magnetic field . as testified by zero magnetic field transport experiments and we analyse how the presence of massive carriers affects the r... | we study the collective modes of a low - energy continuum model of the quasi - two - dimensional electron liquid in a layer of the organic compound(bedt - ttf)i in a perpendicular magnetic field . as testified by zero magnetic field transport experiments and _ ab initio _ theory , this material hosts both massless and ... |
1610.03989 | i | integrable spin chains often provide a fertile ground for studying key theoretical concepts in a simple framework that captures the essential features of the problems under consideration . an important example of this assertion is the analysis of the entanglement of a quantum system , which can be considered as one of ... | in particular , we show that this entropy exhibits the logarithmic growth characteristic of -dimensional cfts and one - dimensional ( fermionic ) critical lattice models , with a central charge consistent with the low - temperature behavior of the free energy . our results confirm the widely believed conjecture that th... | we study the critical behavior and the ground - state entanglement of a large class of supersymmetric spin chains with a general ( not necessarily monotonic ) dispersion relation . we show that this class includes several relevant models , with both short- and long - range interactions of a simple form . we determine ... |
1610.03989 | c | in this paper we have analyzed the critical behavior of a large class of supersymmetric spin chains whose dispersion relation @xmath20 is not assumed to be monotonic in the interval @xmath21 $ ] . we have examined the conditions under which the dispersion relation is well - defined ( i.e. , is a continuous function )... | we study the critical behavior and the ground - state entanglement of a large class of supersymmetric spin chains with a general ( not necessarily monotonic ) dispersion relation . we show that this class includes several relevant models , with both short- and long - range interactions of a simple form . we also study... | we study the critical behavior and the ground - state entanglement of a large class of supersymmetric spin chains with a general ( not necessarily monotonic ) dispersion relation . we show that this class includes several relevant models , with both short- and long - range interactions of a simple form . we determine ... |
1607.03792 | i | dynamical systems are now ubiquitous and are vital in modeling complex systems , especially when they admit recurrence relations . statistical inference for dynamical systems has drawn continuous attention across various fields , the topics of which include parameter estimation , invariant measure estimation , forecast... | observations drawn from dynamical systems are not independent and moreover , usual mixing concepts may not be appropriate for measuring the dependence among these observations . by employing the-mixing concept to measure the dependence , we conduct statistical analysis on the consistency and convergence of the kernel d... | we study the density estimation problem with observations generated by certain dynamical systems that admit a unique underlying invariant lebesgue density . observations drawn from dynamical systems are not independent and moreover , usual mixing concepts may not be appropriate for measuring the dependence among these ... |
cond-mat0608484 | i | the dissipative harmonic oscillator has for long attracted considerable interest as a prototype of open quantum system . the early work of magalinskii @xcite and ullersma @xcite focusing mainly on an ohmic environment and the weak coupling limit has been later extended in many different aspects mol70,dek77,tal81,schm82... | we study the dissipative dynamics of a harmonic oscillator which couples linearly through its position and its momentum to two independent heat baths at the same temperature . we argue that this model describes a large spin in a ferromagnet . such a partial frustration of dissipation can be ascribed to the canonically ... | we study the dissipative dynamics of a harmonic oscillator which couples linearly through its position and its momentum to two independent heat baths at the same temperature . we argue that this model describes a large spin in a ferromagnet . we find that some effects of the two heat baths partially cancel each other .... |
1201.6351 | i | a straight current - carrying wire held in tension between pole faces of a magnet is well known to buckle into a ( roughly ) helical configuration at a critical current ( see fig . [ fig : hel : exp - setup ] ) . a photograph of this phenomenon is shown in section 10.4.3 of @xcite , where a linear stability analysis i... | we study the effect of a magnetic field on the behaviour of a conducting elastic rod subject to a novel set of boundary conditions that , in the case of a transversely isotropic rod , give rise to exact helical post - buckling solutions . the equations used are the geometrically exact kirchhoff equations and both stati... | we study the effect of a magnetic field on the behaviour of a conducting elastic rod subject to a novel set of boundary conditions that , in the case of a transversely isotropic rod , give rise to exact helical post - buckling solutions . the equations used are the geometrically exact kirchhoff equations and both stati... |
astro-ph9709106 | i | massive compact objects appear to be ubiquitous components of galactic nuclei ( @xcite ) . while these mass concentrations need not be black holes current observations fail by orders of magnitude to resolve the schwarzschild radius there is a growing concensus that the black hole model is reasonable and , in many way... | we study the effect of a massive central singularity on the structure of a triaxial galaxy using-body simulations . starting from a single initial model , we grow black holes with various final masses and at various rates , ranging from impulsive to adiabatic . in all cases , however , the rate of change of the galaxy ... | we study the effect of a massive central singularity on the structure of a triaxial galaxy using-body simulations . starting from a single initial model , we grow black holes with various final masses and at various rates , ranging from impulsive to adiabatic . in all cases , the galaxy achieves a final shape that is n... |
astro-ph9709106 | r | the growth of the black hole caused the initially triaxial model to become nearly spherical near the center . we therefore begin by describing the spherically - symmetrized structure of the models at late times , and we compare our results with those of earlier modelling that imposed spherical symmetry . here and below... | the galaxy achieves a final shape that is nearly spherical at the center and close to axisymmetric throughout . when , the galaxy evolves in shape on a timescale that exceeds orbital periods , or roughly a galaxy lifetime . when , the galaxy becomes axisymmetric in little more than a crossing time . | we study the effect of a massive central singularity on the structure of a triaxial galaxy using-body simulations . starting from a single initial model , we grow black holes with various final masses and at various rates , ranging from impulsive to adiabatic . in all cases , the galaxy achieves a final shape that is n... |
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