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astro-ph0607512 | i | in this paper , we present a detailed study of the evolution in the color density relation at @xmath0 . using a sample of galaxies drawn from the deep2 galaxy redshift survey , we estimate the local overdensity about each galaxy according to the projected @xmath36nearest neighbor surface density . from this , we meas... | we find that the fraction of galaxies on the red sequence depends strongly on local environment out to , being larger in regions of greater galaxy density . at all epochs probed , we also find a small population of red , morphologically early type galaxies residing in regions of low measured overdensity . the strength... | using a sample of 19,464 galaxies drawn from the deep2 galaxy redshift survey , we study the relationship between galaxy color and environment at . we find that the fraction of galaxies on the red sequence depends strongly on local environment out to , being larger in regions of greater galaxy density . at all epochs p... |
1109.2671 | i | one of the fundamental assumptions underpinning modern theories of galaxy formation is that galaxies form and evolve in massive virialised haloes of dark matter @xcite . characterising the properties of these haloes is an important problem , both theoretically and observationally , and its study has been one of the mai... | finally , we assess our results in the context of previous studies , and consider their observational implications . [ firstpage ] methods :-body simulations galaxies : formation galaxies : haloes cosmology : theory dark matter large - scale structure of universe | using a statistical sample of dark matter haloes drawn from a suite of cosmological-body simulations of the cold dark matter ( cdm ) model , we quantify the impact of a simulated halo s mass accretion and merging history on two commonly used measures of its dynamical state , the virial ratio and the centre of mass offs... |
1109.2671 | i | the aim of this paper has been to quantify the impact of a dark matter halo s mass accretion and merging history on two measures of dynamical state that are commonly used in cosmological @xmath0-body simulations , namely the virial ratio @xmath23 ( cf . * ? ? ? * ) and the centre - of - mass offset @xmath272 ( cf . * ?... | using a statistical sample of dark matter haloes drawn from a suite of cosmological-body simulations of the cold dark matter ( cdm ) model , we quantify the impact of a simulated halo s mass accretion and merging history on two commonly used measures of its dynamical state , the virial ratio and the centre of mass offs... | using a statistical sample of dark matter haloes drawn from a suite of cosmological-body simulations of the cold dark matter ( cdm ) model , we quantify the impact of a simulated halo s mass accretion and merging history on two commonly used measures of its dynamical state , the virial ratio and the centre of mass offs... |
1205.3332 | c | a detailed study of the numerical impact of kinematic power corrections goes beyond the tasks of this paper . this study has to be done at the level of cross sections , taking into account finite@xmath0 and target mass effects to kinematic ( e.g. phase space ) factors @xcite and including the interference with the beth... | using the formalism developed in we carry out the first complete calculation of kinematic power corrections to the helicity amplitudes of deeply - virtual compton scattering to the twist - four accuracy for a study case of a ( pseudo)scalar target . our main result is that both finite , , and target mass , , twist - fo... | using the formalism developed in we carry out the first complete calculation of kinematic power corrections to the helicity amplitudes of deeply - virtual compton scattering to the twist - four accuracy for a study case of a ( pseudo)scalar target . our main result is that both finite , , and target mass , , twist - fo... |
astro-ph0405525 | m | the high photon rate during grb021206 introduces numerous accidental coincidences . their rate can be determined from fig . [ fig : dtplot ] . we use the accidental coincidences with @xmath59b@xmath21s @xmath60 @xmath61b@xmath21s ( so - called `` time shifted coincidences '' ) and interpolate them around @xmath62 ( se... | this was challenged by a subsequent reanalysis . we perform simulations to obtain the instrument s polarimetric sensitivity , and these simulations include photon polarization . for grb021206 , we formally find a linear polarization degree of% , concluding that the data quality is insufficient to constrain the polariza... | using the rhessi satellite as a compton polarimeter , a recent study claimed that the prompt emission of grb021206 was almost fully linearly polarized . this was challenged by a subsequent reanalysis . we present an novel approach , applying our method to the same data . we identify compton scattering candidates by car... |
astro-ph0512474 | c | in the light of the new metallicity estimates outlined in the previous section , we discuss three possible ucd formation channels : 1 . unusually bright gcs . nuclei of de , ns . 3 . young massive star clusters created in violent star - forming events . + 1 . bright gcs : the brightest fornax ucd ( ucd 3 ) can not be d... | various formation channels for the puzzling ultra - compact dwarf galaxies ( ucds ) have been proposed in the last few years . it is noted that in contrast to that , the properties of virgo ucds are more consistent with the stripping scenario , suggesting that _ different _ ucd formation channels may dominate in either... | various formation channels for the puzzling ultra - compact dwarf galaxies ( ucds ) have been proposed in the last few years . to better judge on some of the competing scenarios , we present spectroscopic [ fe / h ] estimates for a sample of 26 compact objects in the central region of the fornax cluster , covering the ... |
astro-ph0512474 | i | we have presented spectroscopic [ fe / h ] estimates for a sample of 26 compact objects in the central fornax cluster , spanning the luminosity range @xmath0 ( @xmath1 ) mag . our sample includes ucds at the bright end and is dominated by gcs at the faint end . we furthermore present [ fe / h ] measurements for the nuc... | to better judge on some of the competing scenarios , we present spectroscopic [ fe / h ] estimates for a sample of 26 compact objects in the central region of the fornax cluster , covering the magnitude range of ucds and bright globular clusters ( or mag ) . we find a break in the metallicity distribution of compact ob... | various formation channels for the puzzling ultra - compact dwarf galaxies ( ucds ) have been proposed in the last few years . to better judge on some of the competing scenarios , we present spectroscopic [ fe / h ] estimates for a sample of 26 compact objects in the central region of the fornax cluster , covering the ... |
astro-ph9803139 | i | from the fact that @xmath2 when normalised to the stellar mass of a galaxy @xmath2 the specific globular cluster ( * gc * ) frequency @xmath6 is a factor of @xmath7 higher in ellipticals than in spirals , zepf & ashman ( 1993 ) predict that if elliptical galaxies are formed from one major spiral @xmath2 spiral merger t... | this allows us to compare their luminosity function ( * lf * ) , evolved over a hubble time , to lfs observed for the milky way s and other galaxies star cluster systems . since effective radii we also follow the colour evolution of the young star clusters over a hubble time and compare to observations on the milky way... | we analyse the population of bright star clusters in the interacting galaxy pair ngc 4038/39 detected with hst wfpc1 by whitmore & schweizer ( 1995 ) . making use of our spectrophotometric evolutionary synthesis models for various initial metallicities we derive the ages of these star clusters and calculate their futur... |
astro-ph9803139 | c | here we compare average properties of the red ( @xmath144 ) and blue ( @xmath145 ) star cluster subsamples . we argued that the red subsample may mainly consist of the brightest of the original spirals gcs while we expect the blue subsample to contain some mixture of young open clusters , associations and globular clus... | are difficult to determine due to crowding of the clusters , the shape of the lf after a hubble time may help decide whether the young clusters are young globular clusters ( * gc * ) or rather open clusters / ob associations . the age distribution shows that the brightest globular clusters from the interacting galaxies... | we analyse the population of bright star clusters in the interacting galaxy pair ngc 4038/39 detected with hst wfpc1 by whitmore & schweizer ( 1995 ) . making use of our spectrophotometric evolutionary synthesis models for various initial metallicities we derive the ages of these star clusters and calculate their futur... |
astro-ph9803139 | c | using our method of evolutionary synthesis for various metallicities we present a first analysis of ws95 s wfpc1 data on bright star clusters in the ongoing merger - induced starburst in ngc 4038/39 . assuming a metallicity z @xmath199 on the basis of the progenitor spirals ism properties and applying a uniform reddeni... | we analyse the population of bright star clusters in the interacting galaxy pair ngc 4038/39 detected with hst wfpc1 by whitmore & schweizer ( 1995 ) . making use of our spectrophotometric evolutionary synthesis models for various initial metallicities we derive the ages of these star clusters and calculate their futur... | we analyse the population of bright star clusters in the interacting galaxy pair ngc 4038/39 detected with hst wfpc1 by whitmore & schweizer ( 1995 ) . making use of our spectrophotometric evolutionary synthesis models for various initial metallicities we derive the ages of these star clusters and calculate their futur... |
1103.4283 | r | ( 130,90)(0,0 ) ( 0,50)(50,50)5 ( 50,50)(100,100)5 ( 50,50)(100,0)5 ( -15,48)@xmath128 ( 105,98)@xmath55 ( 105,-2)@xmath129 + at leading order the mssm higgs boson decays into squark - antisquark pairs are described by the diagram shown in fig . [ fg : lodia ] . the corresponding partial decay width reads as @x... | in particular the treatment of potentially large higher - order corrections originating from the soft susy breaking parameters , the trilinear higgs coupling to sbottoms , and , the higgsino mass parameter , is investigated . the remaining theoretical uncertainties including the susy - qcd corrections are analyzed quan... | we analyze neutral higgs boson decays into squark pairs in the minimal supersymmetric extension of the standard model and improve previous analyses . in particular the treatment of potentially large higher - order corrections originating from the soft susy breaking parameters , the trilinear higgs coupling to sbottoms ... |
1103.4283 | r | the numerical analysis of the neutral higgs boson decays into stop and sbottom pairs is performed for two mssm scenarios , one close to the one of ref . @xcite where we lifted the gluino and squark masses of the first two generations beyond the mass bounds from the lhc @xcite , and a second scenario with large susy - b... | pr1101 neutral higgs boson decays to squark pairs reanalyzed e. accomando , g. chachamis , f. fugel , m. spira and m. walser _ university of southampton , theory group , southampton so17 1bj , united kingdom + paul scherrer institut , ch-5232 villigen psi , switzerland + institute for theoretical physics ... | we analyze neutral higgs boson decays into squark pairs in the minimal supersymmetric extension of the standard model and improve previous analyses . in particular the treatment of potentially large higher - order corrections originating from the soft susy breaking parameters , the trilinear higgs coupling to sbottoms ... |
0704.0032 | i | the very first data of the kamland collaboration @xcite have been enough to isolate neutrino oscillations as the correct mechanism explaining the solar neutrino problem @xcite , indicating also that large mixing angle ( lma ) was the right solution . the 766.3 ton - yr kamland data sample further strengthens the vali... | we analyze the possibility of probing non - standard neutrino interactions ( nsi , for short ) through the detection of neutrinos produced in a future galactic supernova ( sn ) . this occurs for non - universal nsi strengths of a few % , and for very small flavor - changing nsi above a few . | we analyze the possibility of probing non - standard neutrino interactions ( nsi , for short ) through the detection of neutrinos produced in a future galactic supernova ( sn ) . we consider the effect of nsi on the neutrino propagation through the sn envelope within a three - neutrino framework , paying special attent... |
astro-ph0303556 | i | the temporal structure of gamma - ray bursts ( grbs ) varies drastically , with no apparent pattern among bursts . of the @xmath32704 grbs detected by the batse instrument onboard the compton gamma ray observatory ( cgro ) @xcite , less than 10 @xmath2 of the detected light - curve profiles can be categorized as being ... | we analyze the time profiles of individual gamma - ray burst ( grb ) pulses , that are longer than 2 s , by modelling them with analytical functions that are based on physical first principles and well - established empirical descriptions of grb spectral evolution . we have studied a sample of 77 individual grb pulses ... | we analyze the time profiles of individual gamma - ray burst ( grb ) pulses , that are longer than 2 s , by modelling them with analytical functions that are based on physical first principles and well - established empirical descriptions of grb spectral evolution . these analytical profiles are independent of the emis... |
astro-ph0303556 | c | the fit results presented above indicate that the analytic functions derived in 3 are very successful in describing the overall profile of individual grb pulses . these descriptions differ from those used in previous modelling surveys as they are motivated by physical first principles within the general fireball model... | these analytical profiles are independent of the emission mechanism and can be used to model both the rise and decay profiles allowing for the study of the entire pulse light - curve . using this method , we also find that the ratio between the rise and decay times ( the pulse asymmetry ) exhibited by the grb pulse sha... | we analyze the time profiles of individual gamma - ray burst ( grb ) pulses , that are longer than 2 s , by modelling them with analytical functions that are based on physical first principles and well - established empirical descriptions of grb spectral evolution . these analytical profiles are independent of the emis... |
1703.06022 | i | the development of short and intense laser pulses has opened the possibility to control and observe electronic and nuclear motion on the attosecond time scale @xcite . the new light sources are key to probe and manipulate the electronic structure and dynamics in many - electron atoms @xcite and molecules @xcite . fo... | we apply a three - dimensional ( 3d ) implementation of the time - dependent restricted - active - space self - consistent - field ( td - rasscf ) method to investigate effects of electron correlation in the ground state of be as well as in its photoionization dynamics by short xuv pulses , including time - delay in ph... | we apply a three - dimensional ( 3d ) implementation of the time - dependent restricted - active - space self - consistent - field ( td - rasscf ) method to investigate effects of electron correlation in the ground state of be as well as in its photoionization dynamics by short xuv pulses , including time - delay in ph... |
1703.06022 | r | in this section , we describe the impact of electron correlation on the ground state of be and the photoionization process , including time - delays , due to the interaction with a linearly polarized xuv laser pulse of short duration . we use be for these illustrative calculations because it allows for converged mctdhf... | second , we solve the equations of motion to compute photoelectron spectra of be after interacting with a short linearly polarized xuv laser pulse . finally , we investigate the effects of electron correlation on the magnitude of the relative time - delay in the photoionization process into two different ionic channels... | we apply a three - dimensional ( 3d ) implementation of the time - dependent restricted - active - space self - consistent - field ( td - rasscf ) method to investigate effects of electron correlation in the ground state of be as well as in its photoionization dynamics by short xuv pulses , including time - delay in ph... |
1604.02551 | r | as explained in the previous section , the lets allow one to perform consistency checks of lattice - qcd results for nn scattering provided more than a single observable is extracted . unfortunately , most of the lattice calculations in the nn sector have so far focused on the determination of the binding energies . on... | using the binding energies of the deuteron and dineutron as input , we employ the low - energy theorems to predict the phase shifts and extract the scattering length and the effective range in the and channels . our results for these quantities are consistent with those obtained by the nplqcd collaboration from effecti... | we apply the low - energy theorems to analyze the recent lattice qcd results for the two - nucleon system at a pion mass of mev obtained by the nplqcd collaboration . we find that the binding energies of the deuteron and dineutron are inconsistent with the low - energy behavior of the corresponding phase shifts within... |
1604.02551 | i | in this paper , we have employed the low - energy theorems for nn scattering , which have been generalized in ref . @xcite to the case of unphysical pion masses , to analyze the recent lattice - qcd results at @xmath9 mev reported by the nplqcd collaboration @xcite . the pertinent results of our work can be summarized... | we apply the low - energy theorems to analyze the recent lattice qcd results for the two - nucleon system at a pion mass of mev obtained by the nplqcd collaboration . we find that the binding energies of the deuteron and dineutron are inconsistent with the low - energy behavior of the corresponding phase shifts within... | we apply the low - energy theorems to analyze the recent lattice qcd results for the two - nucleon system at a pion mass of mev obtained by the nplqcd collaboration . we find that the binding energies of the deuteron and dineutron are inconsistent with the low - energy behavior of the corresponding phase shifts within... |
1206.6512 | i | a conservation law ought to explain the change in some physical quantity contained inside a volume of space ( e.g. , total energy ) in terms of related fluxes passing through the bounding surface of that volume . the standard approach to constructing conservation laws is based on the identity : @xmath5 , where @xmath6 ... | we argue that conservation laws based on the _ local _ matter - only stress - energy - momentum tensor ( characterized by energy and momentum per unit _ volume _ ) can not adequately explain a wide variety of even very simple physical phenomena because they fail to properly account for gravitational effects . pmcgrath@... | we argue that conservation laws based on the _ local _ matter - only stress - energy - momentum tensor ( characterized by energy and momentum per unit _ volume _ ) can not adequately explain a wide variety of even very simple physical phenomena because they fail to properly account for gravitational effects . we constr... |
1206.6512 | i | using the standard , local way of constructing conservation laws see equations ( [ bulkdifferential ] ) and ( [ bulkintegrated])we analyzed conservation of energy in the context of a simple example in special relativity , viz . , a box , rigidly accelerating along the @xmath15-axis , that is immersed in a transverse ... | we construct a general _ quasi_local conservation law based on the brown and york _ total _ ( matter _ plus _ gravity ) stress - energy - momentum tensor ( characterized by energy and momentum per unit _ area _ ) , and argue that it _ does _ properly account for gravitational effects . as a simple example of the explan... | we argue that conservation laws based on the _ local _ matter - only stress - energy - momentum tensor ( characterized by energy and momentum per unit _ volume _ ) can not adequately explain a wide variety of even very simple physical phenomena because they fail to properly account for gravitational effects . we constr... |
1504.03245 | i | recent experimental studies of nuclei in the nobelium region provided rich spectroscopic data @xcite , which , in principle , can be used as a benchmark information for extrapolations into the region of superheavy nuclei . numerous theoretical studies are aimed at modelling of these spectroscopic data @xcite so as to... | a comparative analysis of the results obtained for quasiparticle spectra , odd - even and two - particle mass staggering , and moments of inertia allows us to identify single - particle and shell effects that are characteristic to these different models and to illustrate possible systematic uncertainties related to usi... | we calculate properties of the ground and excited states of nuclei in the nobelium region for proton and neutron numbers of and , respectively . we use three different energy - density - functional ( edf ) approaches , based on covariant , skyrme , and gogny functionals , each with two different parameter sets . a comp... |
0807.3802 | i | over the last decades , our understanding of cosmological reionization has improved considerably . observations of high - redshift quasars clearly indicate that reionization must end around @xmath5 @xcite , and the wmap 5-year - measurement finds a reionization optical depth of @xmath6 @xcite , yielding clear evidence ... | we find that stellar populations based on a scalo - type initial mass function for population ii stars can be ruled out as sole sources for reionization , unless star formation efficiencies of more than or very high photon escape fractions from the parental halo are adopted . when considering primordial magnetic fields... | we calculate the reionization history for different models of the stellar population and explore the effects of primordial magnetic fields , dark matter decay and dark matter annihilation on reionization . we find that stellar populations based on a scalo - type initial mass function for population ii stars can be rule... |
0807.3802 | c | we have calculated the reionization optical depth for different stellar models in the presence of primordial magnetic fields as well as dark matter annihilation and decay . the results indicate which star formation efficiencies are required in the presence of some additional heating mechanism for a given stellar model ... | we calculate the reionization history for different models of the stellar population and explore the effects of primordial magnetic fields , dark matter decay and dark matter annihilation on reionization . these limits are in agreement with constraints from recombination and provide an independent confirmation at a muc... | we calculate the reionization history for different models of the stellar population and explore the effects of primordial magnetic fields , dark matter decay and dark matter annihilation on reionization . we find that stellar populations based on a scalo - type initial mass function for population ii stars can be rule... |
hep-ph0105003 | i | branching ratios of @xmath3 meson two - body nonleptonic decays have been measured by cleoiii , belle and babar collaborations @xcite . cp violations in these modes may be observed in near future . cognizant of this point , we have presented some theoretical anticipations for the @xmath10 @xcite , @xmath11 @xcite , and... | we explain the basic principle by discussing the pion electromagnetic form factor . it is shown that the logarithmic and linear singularities occurring at small momentum fractions of light meson distribution amplitudes do not exist in a self - consistent perturbative analysis , which includes and threshold resummations... | we calculate the transition form factors in the framework of perturbative qcd to leading power of , being the meson mass . we explain the basic principle by discussing the pion electromagnetic form factor . it is shown that the logarithmic and linear singularities occurring at small momentum fractions of light meson di... |
hep-ph0105003 | c | in this paper we have presented a complete leading - power and leading - order pqcd evaluation of the @xmath19 , @xmath28 transition form factors in the large recoil region . it has been shown that under sudakov suppression arising from @xmath4 and threshold resummations , the end - point singularities ( logarithmic at... | * * _ department of physics , toyama university , toyama 930 - 8555 , japan _ * * _ department of physics , national cheng - kung university , + tainan , taiwan 701 , republic of china _ * * _ national center for theoretical sciences , hsinchu , taiwan 300 , republic of china _ * * _ department of physics ,... | we calculate the transition form factors in the framework of perturbative qcd to leading power of , being the meson mass . we explain the basic principle by discussing the pion electromagnetic form factor . it is shown that the logarithmic and linear singularities occurring at small momentum fractions of light meson di... |
1611.00392 | i | in this section we briefly review the different models that , at the background level , lead to distinct future cosmological abrupt events : ( i ) big rip ( br ) , ( ii ) little rip ( lr ) and ( iii ) little sibling of the big rip ( lsbr ) . we will consider a homogeneous and isotropic universe described by the friedma... | these three set - ups are described classically by perfect fluids with a phantom nature and represent deviations from the most widely acceptedcdm model . in addition , each of the models under study induce different future singularities or abrupt events known as ( i ) big rip , ( ii ) little rip and ( iii ) little sibl... | we carry out an analysis of the cosmological perturbations in general relativity for three different models which are good candidates to describe the current acceleration of the universe . these three set - ups are described classically by perfect fluids with a phantom nature and represent deviations from the most wide... |
1611.00392 | c | in this work , we analyse the cosmological perturbations within the framework of gr , taking into full account the presence of de at the perturbative level . the de component is described by three different models , where each one of them behaves almost as @xmath0cdm model at present but induces a unique doomsday scena... | for this reason , we refer to the others as abrupt events . with the aim to find possible footprints of this scenario in the universe matter distribution , finally , we constrain observationally these models using several measurements of the growth rate function , more precisely , and compare our results with the obser... | we carry out an analysis of the cosmological perturbations in general relativity for three different models which are good candidates to describe the current acceleration of the universe . these three set - ups are described classically by perfect fluids with a phantom nature and represent deviations from the most wide... |
1606.06837 | i | in this article we present a lagrangian approach for studying possibly nonsymmetric diffusion operators . for instance , we consider operators of the form @xmath3 where @xmath4 is the laplace - beltrami operator of a compact smooth riemannian manifold @xmath5 and @xmath6 is a smooth @xmath1-form on @xmath7 . then the b... | we characterize lower bounds for the bakry - emery ricci tensor of nonsymmetric diffusion operators by convexity of entropy on the-wasserstein space , and define a curvature - dimension condition for general metric measure spaces together with a square integrable-form in the sense of . this extends the lott - sturm - v... | we characterize lower bounds for the bakry - emery ricci tensor of nonsymmetric diffusion operators by convexity of entropy on the-wasserstein space , and define a curvature - dimension condition for general metric measure spaces together with a square integrable-form in the sense of . this extends the lott - sturm - v... |
1404.1386 | i | it is common knowledge that effective theories valid above some distance scale provide an excellent description of phenomena down to that scale . hydrodynamics does not require us to even know about the existence of atoms , and applies at distance scales much larger than the size of atoms . likewise , an understanding ... | we compare and contrast three different sensitivity measures , , and that have been used in discussions of fine - tuning . we argue that though not a fine - tuning measure , , which is essentially determined by the particle spectrum , is important because quantifies the _ minimum _ fine - tuning present in any theory w... | we compare and contrast three different sensitivity measures , , and that have been used in discussions of fine - tuning . we argue that though not a fine - tuning measure , , which is essentially determined by the particle spectrum , is important because quantifies the _ minimum _ fine - tuning present in any theory w... |
1409.8304 | i | ly@xmath2 is the most common electronic transition in the universe . most often , it is a product of the photo - ionizing photons emitted by young stars : as recombining electrons cascade through the energy levels , they are funneled into hydrogen s @xmath10 state by the high optical depth of the interstellar medium to... | we compare the h line strengths of star - forming galaxies observed with the near - ir grism of the _ hubble space telescope _ with ground - based measurements of ly from the hetdex pilot survey and narrow - band imaging . by examining the line ratios of 73 galaxies , we show that most star - forming systems at this ep... | we compare the h line strengths of star - forming galaxies observed with the near - ir grism of the _ hubble space telescope _ with ground - based measurements of ly from the hetdex pilot survey and narrow - band imaging . by examining the line ratios of 73 galaxies , we show that most star - forming systems at this ep... |
1604.04648 | i | carbon nanotubes ( cnts ) are quasi - one - dimensional materials with a unique set of optical and electronic properties @xcite . today , there is considerable interest in semiconducting cnts as the light - absorbing material in organic solar cells , owing to their tunable band gap , excellent carrier mobility , and ch... | we compute the exciton transfer ( et ) rate between semiconducting single - wall carbon nanotubes ( swnts ) . the swnt excitonic states are calculated by solving the bethe - salpeter equation using tight - binding basis functions . the et rates due to intertube coulomb interaction are computed via fermi s golden rule .... | we compute the exciton transfer ( et ) rate between semiconducting single - wall carbon nanotubes ( swnts ) . we show that the main reasons for the wide range of measured et rates reported in the literature are 1 ) exciton confinement in local quantum wells stemming from disorder in the environment and 2 ) exciton ther... |
1604.04648 | c | in summary , we calculated the exciton transfer rates between semiconducting cnts of different chiralities and relative orientations . the exciton transfer rate is weakly dependent on the orientation of the tubes . this finding is in contradiction with previous theoretical studies , but in good agreement with experimen... | we show that the main reasons for the wide range of measured et rates reported in the literature are 1 ) exciton confinement in local quantum wells stemming from disorder in the environment and 2 ) exciton thermalization between dark and bright states due to intratube scattering . the et rate also increases with increa... | we compute the exciton transfer ( et ) rate between semiconducting single - wall carbon nanotubes ( swnts ) . we show that the main reasons for the wide range of measured et rates reported in the literature are 1 ) exciton confinement in local quantum wells stemming from disorder in the environment and 2 ) exciton ther... |
quant-ph0307220 | i | the field of quantum algorithms has witnessed several important results ( e.g. , @xcite ) in the last decade , since the breakthrough discovery of shor s quantum algorithm for factoring and discrete logarithm in 1994 @xcite . despite these important developments , two problems in particular had little progress in terms... | we consider , a gap version of the shortest vector in a lattice problem . this problem is known to be in but is not known to be in or in . we prove that it lies inside , the quantum analogue of . this is the first non - trivial upper bound on the quantum complexity of a lattice problem . first , we give a new charac... | we consider , a gap version of the shortest vector in a lattice problem . this problem is known to be in but is not known to be in or in . we prove that it lies inside , the quantum analogue of . this is the first non - trivial upper bound on the quantum complexity of a lattice problem . the proof relies on two nove... |
hep-ph0407180 | i | supersymmetry ( susy ) provides an elegant solution to the gauge hierarchy problem , and grand unified theories ( guts ) give us a simple understanding of the quantum numbers of the standard model ( sm ) fermions . in addition , the success of gauge coupling unification in the minimal supersymmetric standard model ( ms... | we discuss the models with bi - fundamental link fields where the gauge symmetry can be broken down to the pati - salam , , flipped or the standard model like gauge symmetry . we also propose an model with bi - fundamental link fields where the gauge symmetry is broken down to the pati - salam gauge symmetry , and an m... | we consider 4-dimensional supersymmetric models inspired by deconstruction of 5-dimensional supersymmetric orbifold models and high dimensional non - supersymmetric models with wilson line gauge symmetry breaking . we discuss the models with bi - fundamental link fields where the gauge symmetry can be broken down to th... |
1503.06994 | i | the present paper investigates general relativistic flat friedmann - lematre - robertson - walker ( flrw ) models with a minimally coupled scalar field with a monomial potential , @xmath0 ( @xmath1 , @xmath2 ) , and a perfect fluid . the perfect fluid is assumed to obey a linear equation of state , @xmath3 , where @xma... | we consider a minimally coupled scalar field with a monomial potential and a perfect fluid in flat flrw cosmology . we apply local and global dynamical systems techniques to a new three - dimensional dynamical systems reformulation of the field equations on a compact state space . this leads to a visual global descript... | we consider a minimally coupled scalar field with a monomial potential and a perfect fluid in flat flrw cosmology . we apply local and global dynamical systems techniques to a new three - dimensional dynamical systems reformulation of the field equations on a compact state space . this leads to a visual global descript... |
1511.05478 | i | in recent years , molecular genetic data have been used extensively to learn about the evolutionary processes that gave rise to the observed genetic variation . one important example is the use of genetic data to try to infer whether or not gene flow occurred between closely related species during or after speciation (... | we consider a model of isolation with an initial period of migration " ( iim ) , where an ancestral population instantaneously split into two descendant populations which exchanged migrants symmetrically at a constant rate for a period of time but which are now completely isolated from each other . a method of maximum... | we consider a model of isolation with an initial period of migration " ( iim ) , where an ancestral population instantaneously split into two descendant populations which exchanged migrants symmetrically at a constant rate for a period of time but which are now completely isolated from each other . a method of maximum... |
1207.3757 | i | let @xmath5 be a semimartingale , which is observed at discrete times @xmath6 for @xmath7 , over a finite time interval @xmath8 $ ] , with a discretization mesh @xmath9 which is small and eventually goes to @xmath10 ( high - frequency setting ) . one of the main problems encountered in practice is the estimation of the... | we consider a multidimensional it semimartingale regularly sampled on $ ] at high frequency , with going to zero . the goal of this paper is to provide an estimator for the integral over $ ] of a given function of the volatility matrix . to approximate the integral we show that although the accuracy of the pointwise es... | we consider a multidimensional it semimartingale regularly sampled on $ ] at high frequency , with going to zero . the goal of this paper is to provide an estimator for the integral over $ ] of a given function of the volatility matrix . to approximate the integral , we simply use a riemann sum based on local estimator... |
patt-sol9609003 | i | close to a pattern - forming transition , many hydrodynamic systems can be described by coupled one - dimensional ( 1d ) ginzburg - landau equations for some envelope functions ( order parameters ) @xmath0 and @xmath1 . these equations were first introduced in an explicit form ( with purely real coefficients , but also... | group - velocity terms are added to the nld and rgl equations , which breaks the variational structure of these models . in the simplest case of two coupled nld equations , dynamical behavior sets in , which we consider in detail . in the cgl equations , a spatially dependent coupling coefficient as considered in this ... | we consider domain walls ( dw s ) between single - mode and bimodal states that occur in coupled nonlinear diffusion ( nld ) , real ginzburg - landau ( rgl ) , and complex ginzburg - landau ( cgl ) equations with a spatially dependent coupling coefficient . group - velocity terms are added to the nld and rgl equations ... |
patt-sol9609003 | c | in this paper we have considered domain walls between single - mode and bimodal states for three types of coupled equations with a spatially dependent coupling coefficient . in the simplest case of two coupled nld equations with the group - velocity terms , we were able to reduce the description of stationary configura... | we consider domain walls ( dw s ) between single - mode and bimodal states that occur in coupled nonlinear diffusion ( nld ) , real ginzburg - landau ( rgl ) , and complex ginzburg - landau ( cgl ) equations with a spatially dependent coupling coefficient . we reduce the description of stationary configurations to a si... | we consider domain walls ( dw s ) between single - mode and bimodal states that occur in coupled nonlinear diffusion ( nld ) , real ginzburg - landau ( rgl ) , and complex ginzburg - landau ( cgl ) equations with a spatially dependent coupling coefficient . group - velocity terms are added to the nld and rgl equations ... |
1104.3128 | i | facility location problems have been widely studied in the operations research community ( see , e.g. , @xcite ) . in its simplest version , _ uncapacitated facility location _ ( ) , we are given a set of facilities with opening costs , and a set of clients , and we want to open some facilities and assign each client ... | a feasible solution specifies a subset of facilities to open , and assigns each client to an open facility so that each open facility serves _ at least clients _ , where is an input parameter . the cost of such a solution is , and the goal is to find a feasible solution of minimum cost . the current best approximati... | we consider the _ lower - bounded facility location _ ( ) problem ( also sometimes called _ load - balanced facility location _ ) , which is a generalization of _ uncapacitated facility location _ ( ) , where each open facility is required to serve a certain _ minimum _ amount of demand . more formally , an instance of... |
1509.01128 | i | one of the most fundamental dimension theoretic questions in geometric measure theory is : _ how does dimension behave under orthogonal projection _ ? this line of research began with the seminal paper of marstrand from 1954 @xcite , influenced by some earlier work of besicovitch . one version of marstrand s projection... | we consider the assouad dimensions of orthogonal projections of planar sets onto lines . our investigation covers both general and self - similar sets . for general sets , compared to the famous analogue for hausdorff dimension namely _ marstrand s projection theorem _ a striking difference is that the words ` at ... | we consider the assouad dimensions of orthogonal projections of planar sets onto lines . our investigation covers both general and self - similar sets . for general sets , the main result is the following : if a set in the plane has assouad dimension $ ] , then the projections have assouad dimension at least almost ... |
1509.01128 | r | we parameterise orthogonal projections onto lines in @xmath55 by @xmath56 in the natural way , by letting @xmath57 be the projection onto the line @xmath58 passing through the origin and forming an angle @xmath59 with the positive @xmath24-axis . with this notation , our main result for general sets is the following : ... | the main result is the following : if a set in the plane has assouad dimension $ ] , then the projections have assouad dimension at least almost surely . our investigation splits naturally into two cases : when the group of rotations is discrete , and when it is dense . in the ` discrete rotations ' case we prove the f... | we consider the assouad dimensions of orthogonal projections of planar sets onto lines . our investigation covers both general and self - similar sets . for general sets , the main result is the following : if a set in the plane has assouad dimension $ ] , then the projections have assouad dimension at least almost ... |
1207.3859 | i | consider the estimation of a random vector @xmath0 from the measurement model illustrated in figure [ fig : model ] . the random vector @xmath2 , which is assumed to have independent and identically distributed ( i.i.d . ) components @xmath3 , is passed through a known linear transform that outputs @xmath4 . the compo... | the methodology can be applied to a large class of learning problems including the learning of sparse priors in compressed sensing or identification of linear - nonlinear cascade models in dynamical systems and neural spiking processes . gaussian transform matrices the asymptotic componentwise behavior of the adaptive ... | we consider the estimation of an i.i.d . ( possibly non - gaussian ) vector from measurements obtained by a general cascade model consisting of a known linear transform followed by a probabilistic componentwise ( possibly nonlinear ) measurement channel . a novel method , called adaptive generalized approximate messag... |
1207.3859 | c | we have presented an adaptive gamp method for the estimation of i.i.d . vectors @xmath2 observed through a known linear transforms followed by an arbitrary , componentwise random transform . the procedure , which is a generalization of em - gamp methodology of @xcite that estimates both the vector @xmath2 as well as pa... | ( possibly non - gaussian ) vector from measurements obtained by a general cascade model consisting of a known linear transform followed by a probabilistic componentwise ( possibly nonlinear ) measurement channel . the proposed algorithm is a generalization of a recently - developed em - gamp that uses expectation - ma... | we consider the estimation of an i.i.d . ( possibly non - gaussian ) vector from measurements obtained by a general cascade model consisting of a known linear transform followed by a probabilistic componentwise ( possibly nonlinear ) measurement channel . a novel method , called adaptive generalized approximate messag... |
1105.3716 | i | you have left your smartphone on the table at a cafeteria . you soon realize and go back to take it . fortunately , it is still there ! you feel safe while you are not safe at all . an adversary has connected your smartphone to a laptop and dumped all of its memory , including public and secret cryptographic keys . it... | this can happen quite easily , because of a virus that immediately after sending all the content of the infected device to the adversary destroys itself , or just because the owner has left his device unattended for a few minutes in a hostile environment . our idea is to use social physical contacts , securely collecte... | we consider the problem of detecting clones in wireless mobile ad - hoc networks . we assume that one of the devices of the network has been cloned . everything , including certificates and secret keys . this can happen quite easily , because of a virus that immediately after sending all the content of the infected dev... |
1703.05788 | i | optimal alignments are among the main two components used by most dna - alignment algorithms which try to find similar substrings in dna - sequences . because of its great practical importance , these problems have received a tremendous amount of attention . let us explain the key points from the dna perspective . dna ... | we consider two independent binary i.i.d . random strings and of equal length and the optimal alignments according to a symmetric scoring functions only . we decompose the space of scoring functions into five components . is equivalent to aligning a string with its descendants in case of mutations and deletes . | we consider two independent binary i.i.d . random strings and of equal length and the optimal alignments according to a symmetric scoring functions only . we decompose the space of scoring functions into five components . two of these components add a part to the optimal score which does not depend on the alignment and... |
1504.06947 | i | let @xmath13 be @xmath0 open , bounded and simply connected sets in @xmath5 with lipschitz boundaries , containing the origin . we assume that their sizes and lipschitz constants are uniformly bounded . we set @xmath14 to be the small bodies characterized by the parameter @xmath15 and the locations @xmath16 , @xmath17 ... | we deal with the elastic scattering by a large number of rigid bodies of arbitrary shapes with maximum radius with constant lam coefficients and . this mass density is described by two coefficients : one modeling the local distribution of the small bodies and the other one by their geometries . in particular , if the d... | we deal with the elastic scattering by a large number of rigid bodies of arbitrary shapes with maximum radius with constant lam coefficients and . we show that , when these rigid bodies are distributed arbitrarily ( not necessarily periodically ) in a bounded region of where their number is and the minimum distance bet... |
1211.2630 | i | recently , there has been increasing interest in analyzing on - line auction data and in inferring the underlying dynamics that drive the bidding process . each series of price bids for a given auction corresponds to pairs of random bidding times and corresponding bid prices generated whenever a bidder places a bid [ j... | this equation may be empirically obtained from longitudinal observations for a sample of subjects and does not presuppose specific knowledge of the underlying processes . for the nonparametric estimation of the components of the differential equation , it suffices to have available sparsely observed longitudinal measur... | we demonstrate that the processes underlying on - line auction price bids and many other longitudinal data can be represented by an empirical first order stochastic ordinary differential equation with time - varying coefficients and a smooth drift process . this equation may be empirically obtained from longitudinal ob... |
1211.2630 | c | the main motivation of using the dynamic system approach based on ( [ de ] ) is that it provides a better description of the mechanisms that drive longitudinal data but are not directly observable . the empirical dynamic equation may also suggest constraints on the form of parametric differential equations that are com... | the drift process that drives the equation determines how closely individual process trajectories follow a deterministic approximation of the differential equation . we illustrate the differential equation with an application to the dynamics of on - line auction data.=-1 and . . | we demonstrate that the processes underlying on - line auction price bids and many other longitudinal data can be represented by an empirical first order stochastic ordinary differential equation with time - varying coefficients and a smooth drift process . this equation may be empirically obtained from longitudinal ob... |
1205.5283 | c | decaying dark matter has come to the front stage recently as an explanation , alternative to annihilating dm , for the anomalies in cr cosmic rays in , and . but , more generally , decaying dm is a viable possibility that is or can naturally be embedded in many dm models . it is therefore interesting to explore its pa... | we derive new bounds on decaying dark matter from the gamma ray measurements of ( i ) the isotropic residual ( extragalactic ) background by and ( ii ) the fornax galaxy cluster by . * * marco cirelli* , * emmanuel moulin* , * paolo panci* , + * pasquale d. serpico* , * aion viana* _http://ph - dep - th.web.cer... | we derive new bounds on decaying dark matter from the gamma ray measurements of ( i ) the isotropic residual ( extragalactic ) background by and ( ii ) the fornax galaxy cluster by . we find that those from ( i ) are among the most stringent constraints currently available , for a large range of dm masses and a variet... |
0801.1232 | r | figure [ f : f16 ] and figure [ f : f17 ] present the main result of our analysis , @xmath5 , an estimate of the circular velocity curve from @xmath98 kpc . this represents the first time that the circular curve for the galaxy has been estimated to such large distances at this accuracy . note that at small radii thi... | this procedure results in an estimate of the milky way s circular velocity curve to kpc , which is found to be slightly falling from the adopted value of at the sun s location , and implies mm . if we assume an nfw halo profile of characteristic concentration holds , we can use the observations to estimate the virial ... | we derive new constraints on the mass of the milky way s dark matter halo , based on a set of halo stars from sdss as kinematic tracers . our sample comprises rigorously selected blue horizontal - branch ( bhb ) halo stars at kpc , and with distances from the galactic center up to kpc , with photometry and spectra draw... |
0801.1232 | i | we have constrained the mass distribution of the milky way s dark matter halo , by analyzing the kinematics of nearly @xmath231 bhb stars drawn from sdss dr-6 , which reach to galactocentric distances of @xmath232 kpc . to obtain a `` clean sample '' of bhb stars , we have re - analyzed all candidate bhb spectra , foll... | we derive new constraints on the mass of the milky way s dark matter halo , based on a set of halo stars from sdss as kinematic tracers . this sample enables construction of the full line - of - sight velocity distribution at different galactocentric radii . to interpret these distributions , we compare them to matched... | we derive new constraints on the mass of the milky way s dark matter halo , based on a set of halo stars from sdss as kinematic tracers . our sample comprises rigorously selected blue horizontal - branch ( bhb ) halo stars at kpc , and with distances from the galactic center up to kpc , with photometry and spectra draw... |
0707.3595 | i | with the start of data taking at the large hadron collider ( lhc ) , particle physics will , for the first time , directly probe the tera scale , i.e. the scale of electroweak symmetry breaking according to the standard model ( sm ) , around @xmath2 . while the sm has been confirmed experimentally to be a very pre... | we derive the most general seiberg - witten maps for noncommutative gauge theories in second order of the noncommutative parameter . in particular , we demonstrate that some of these ambiguities enter observables like scattering cross sections and enlarge the parameter space of the noncommutative standard model beyond... | we derive the most general seiberg - witten maps for noncommutative gauge theories in second order of the noncommutative parameter . our results reveal the existence of more ambiguities than previously known . in particular , we demonstrate that some of these ambiguities enter observables like scattering cross section... |
hep-ph9911516 | i | the ground state ( `` vacuum '' ) of non - abelian gauge theories like qcd is known to be very rich . it includes topologically non - trivial fluctuations of the gauge fields , carrying an integer topological charge @xmath1 . the simplest building blocks of topological structure in the vacuum are @xcite _ instantons _... | we describe a monte carlo event generator for the simulation of qcd - instanton induced processes in deep - inelastic scattering ( hera ) . it incorporates the theoretically predicted production rate for instanton - induced events as well as the essential characteristics that have been derived theoretically for the par... | we describe a monte carlo event generator for the simulation of qcd - instanton induced processes in deep - inelastic scattering ( hera ) . the qcdins package is designed as an `` add - on '' hard process generator interfaced to the general hadronic event simulation package herwig . it incorporates the theoretically pr... |
astro-ph9806001 | i | the issue of whether galaxy disks are significantly opaque is a lively topic of current research and debate ( e.g. , davies & burstein 1995 , and papers therein ) , and the conclusions of different workers often differ widely . statistical evidence that most large presented by valentijn ( 1990 ) based on a diameter - s... | we describe a new , direct method for determining the opacity of foreground galaxies which does not require any _ a priori _ assumptions about the spatial distribution or the reddening law of the obscuring material . the method is to measure the colors and counts of background galaxies which can be identified through t... | we describe a new , direct method for determining the opacity of foreground galaxies which does not require any _ a priori _ assumptions about the spatial distribution or the reddening law of the obscuring material . the method is to measure the colors and counts of background galaxies which can be identified through t... |
astro-ph9806001 | r | synthetic fields were produced with varying + amounts of ( spatially uniform ) attenuation and reddening ( table 2 ) . the idea is to attenuate the hdf fields until one recovers the same number of simulated and real background galaxies . this attenuation , derived from the number - counts , should correspond to th... | ngc 4536 shows an extinction 1 mag in the northwestern arm region , and lower than 0.5 mag in the corresponding interarm region ( no correction for inclination has been attempted ) . however , from the galaxy colors , the same reddening of is observed in both the arm and the interarm regions . in the interarm region , ... | we describe a new , direct method for determining the opacity of foreground galaxies which does not require any _ a priori _ assumptions about the spatial distribution or the reddening law of the obscuring material . the method is to measure the colors and counts of background galaxies which can be identified through t... |
1607.05876 | i | the set of all rotations in @xmath5 forms a group denoted by @xmath1 . we may think of it as the group of @xmath6 orthogonal matrices with unit determinant . as a topological space it has the structure of a smooth @xmath7-dimensional submanifold of @xmath8 . the group structure is compatible with the smooth one in the ... | the fundamental group of appears in our approach as the center of a certain finite group defined by generators and relations . the latter is a factor group of the braid group , obtained by imposing one additional relation and turns out to be a nontrivial central extension by of the corresponding group of rotational sym... | we describe an algebraic proof of the well - known topological fact that . the fundamental group of appears in our approach as the center of a certain finite group defined by generators and relations . the latter is a factor group of the braid group , obtained by imposing one additional relation and turns out to be a n... |
1512.05599 | i | in the study of dynamical systems with complicated and possibly chaotic dynamics , average quantities are often of more interest than any particular solution trajectory . this is partly because of the difficulty of computing a trajectory precisely and partly because average quantities are more important in many applica... | the dynamics and the quantities to be bounded are assumed to be polynomial functions of the state variables . we describe two closely related ways past this obstacle : one that requires knowing a subset of the basin of attraction , and another that considers the zero - noise limit of the corresponding stochastic system... | we describe methods for proving upper and lower bounds on infinite - time averages in deterministic dynamical systems and on stationary expectations in stochastic systems . the dynamics and the quantities to be bounded are assumed to be polynomial functions of the state variables . the methods are computer - assisted ,... |
1512.05599 | c | in this work we have presented computer - assisted methods for deriving bounds on average quantities in both deterministic and stochastic dynamical systems using sum - of - squares programming . we have given particular attention to proving bounds that apply only to trajectories approaching a particular attractor . one... | we describe methods for proving upper and lower bounds on infinite - time averages in deterministic dynamical systems and on stationary expectations in stochastic systems . the methods are computer - assisted , using sum - of - squares polynomials to formulate sufficient conditions that can be checked by semidefinite p... | we describe methods for proving upper and lower bounds on infinite - time averages in deterministic dynamical systems and on stationary expectations in stochastic systems . the dynamics and the quantities to be bounded are assumed to be polynomial functions of the state variables . the methods are computer - assisted ,... |
astro-ph9706276 | i | in a previous paper we discussed the evolution and x - ray appearance of hot interstellar gas in a family of massive , slowly rotating , isolated elliptical galaxies having different ellipticities and rotation rates ( brighenti & mathews 1996 , a.k.a . paper 1 ) . when large , non - rotating ellipticals are flattened b... | we describe the evolution of interstellar gas in a family of low luminosity elliptical galaxies all having but with different degrees of flattening ( e0 , e2 , and e6 ) and two current supernova rates , snu = 0.01 and 0.04 . the galaxies are composed of 90 percent dark matter , are rotationally flattened and have isotr... | we describe the evolution of interstellar gas in a family of low luminosity elliptical galaxies all having but with different degrees of flattening ( e0 , e2 , and e6 ) and two current supernova rates , snu = 0.01 and 0.04 . the galaxies are composed of 90 percent dark matter , are rotationally flattened and have isotr... |
astro-ph9706276 | c | hot interstellar gas in low - luminosity ellipticals is more vulnerable to outflow than that in brighter ellipticals because the specific gravitational binding energy decreases with galactic luminosity along the fundamental plane . low - luminosity ellipticals are also thought to be rotationally flattened which causes ... | the soft x - ray luminosity of the hot interstellar gas after evolving for 15 gyrs decreases dramatically with increasing galactic rotation . the outer radius of the disk can be much reduced by increasing the supernova rate which drives a gentle galactic wind transporting high angular momentum gas out of the galaxy . t... | we describe the evolution of interstellar gas in a family of low luminosity elliptical galaxies all having but with different degrees of flattening ( e0 , e2 , and e6 ) and two current supernova rates , snu = 0.01 and 0.04 . the galaxies are composed of 90 percent dark matter , are rotationally flattened and have isotr... |
1208.3351 | i | the study of star formation , stellar populations and galactic structure is currently being transformed by a new generation of galactic plane surveys . these surveys have much higher resolution and sensitivity than previous surveys and are at infrared and longer wavelengths that can penetrate the high extinction of the... | we describe the motivation , design and implementation of the cornish survey , an arcsecond resolution radio continuum survey of the inner galactic plane at 5ghz using the karl g. jansky very large array ( vla ) . it is a blind survey co - ordinated with the northern _ spitzer _ glimpse i region covering 10 and at si... | we describe the motivation , design and implementation of the cornish survey , an arcsecond resolution radio continuum survey of the inner galactic plane at 5ghz using the karl g. jansky very large array ( vla ) . it is a blind survey co - ordinated with the northern _ spitzer _ glimpse i region covering 10 and at si... |
1208.3351 | c | the cornish survey is a new sensitive , high spatial resolution galactic plane survey at 5ghz . it is targeted at compact thermal sources and @xmath54 regions in particular . conceived to complement the _ spitzer _ glimpse survey , it will systematically address key questions in massive star formation such as the lifet... | we discuss in detail the strategy that we employed to control the shape of the synthesised beam across this survey that covers a wide range of fairly low declinations . two snapshots separated by 4 hours in hour angle kept the beam elongation to less that 1.5 over 75% of the survey area and less than 2 over 98% of the ... | we describe the motivation , design and implementation of the cornish survey , an arcsecond resolution radio continuum survey of the inner galactic plane at 5ghz using the karl g. jansky very large array ( vla ) . it is a blind survey co - ordinated with the northern _ spitzer _ glimpse i region covering 10 and at si... |
1702.00981 | i | positronium ( ps ) is a light atom that consists of an electron and its antiparticle , the positron . positron- and positronium - annihilation - lifetime spectroscopy is a widely used tool for studying materials , e.g. , for determining pore sizes and free volume . for smaller pores the radius of the ps atom itself can... | we determine effective collisional radii of positronium ( ps ) by considering ps states in hard - wall spherical cavities . we show that for , , and states of ps , the effective radius decreases with the increasing ps center - of - mass momentum , and find a.u . in the zero - momentum limit . | we determine effective collisional radii of positronium ( ps ) by considering ps states in hard - wall spherical cavities . -spline basis sets of electron and positron states inside the cavity are used to construct the states of ps . accurate ps energy eigenvalues are obtained by extrapolation with respect to the numbe... |
physics0309074 | i | complexes of small molecules with variable number of para - hydrogen ( @xmath3-h@xmath4 ) molecules pose a challenging and fascinating arena for the manifestation of nuclear quantum effects on structure and spectroscopy . like their better known analogous helium clusters , para - hydrogen clusters are expected to be st... | we determine the structure and energetics of complexes of the linear ocs molecule with small numbers of para - hydrogen molecules ,=1 - 8 , using zero temperature quantum monte carlo methods . ground state calculations are carried out with importance - sampled rigid body diffusion monte carlo ( is - rbdmc ) and excited... | we determine the structure and energetics of complexes of the linear ocs molecule with small numbers of para - hydrogen molecules ,=1 - 8 , using zero temperature quantum monte carlo methods . ground state calculations are carried out with importance - sampled rigid body diffusion monte carlo ( is - rbdmc ) and excited... |
astro-ph0109365 | c | in this paper , we compared model single stellar population spectra to the integrated spectrum of the metal - rich galactic globular cluster 47 tuc . the model spectra were computed from two sets of state - of - the - art theoretical isochrones . we tested the sensitivity of our predictions to variations in a number of... | we develop a new set of models for intermediate - metallicity single stellar populations in the blue / optical region and use those models to determine the spectroscopic age of 47 tuc . after all corrections are made , the cmd and the spectroscopic ages ( from and ) are in close agreement : 1112 gyrs for salaris isochr... | we develop a new set of models for intermediate - metallicity single stellar populations in the blue / optical region and use those models to determine the spectroscopic age of 47 tuc . the models are based on a moderately high - resolution ( 1.8 fwhm ) empirical spectral library , state - of - the - art theoretical i... |
1105.2479 | i | consider the scattering of time - harmonic electromagnetic waves by a bounded obstacle @xmath1 in @xmath2 with a smooth and simply connected boundary @xmath3 filled with an homogeneous dielectric material . this problem is described by the system of maxwell s equations with piecewise constant electric permittivity and ... | we develop the shape derivative analysis of solutions to the problem of scattering of time - harmonic electromagnetic waves by a penetrable bounded obstacle . since boundary integral equations are a classical tool to solve electromagnetic scattering problems , we study the shape differentiability properties of the stan... | we develop the shape derivative analysis of solutions to the problem of scattering of time - harmonic electromagnetic waves by a penetrable bounded obstacle . since boundary integral equations are a classical tool to solve electromagnetic scattering problems , we study the shape differentiability properties of the stan... |
1003.2557 | i | core - collapse supernovae ( sne ) are extraordinary events situated at the crossroads of many fields of astrophysics . they mark the birth of compact objects , either neutron stars or stellar - mass black holes which , owing to their high compactness , are often the site of tremendous magnetic fields , as in magnetars... | we discuss a new one - dimensional non - lte time - dependent radiative - transfer technique for the simulation of supernova ( sn ) spectra and light curves . starting from a hydrodynamical input characterizing the homologously - expanding ejecta at a chosen post - explosion time the effects of line blanketing on the r... | we discuss a new one - dimensional non - lte time - dependent radiative - transfer technique for the simulation of supernova ( sn ) spectra and light curves . starting from a hydrodynamical input characterizing the homologously - expanding ejecta at a chosen post - explosion time , we model the evolution of the _ entir... |
1003.2557 | c | we have presented a new approach for radiative - transfer modeling of sn ejecta , retaining the key assets of our former approaches . by treating non - lte explicitly and incorporating time - dependent terms in the statistical - equilibrium , energy , and moments of the radiative transfer equations , we improve the phy... | problem are the adopted initial ejecta , a zero - flux inner boundary and a free - streaming outer boundary . the fastest evolution occurs prior to day 1 , with a spectral energy distribution peaking in the range - 2000 , subject to line blanketing from highly ionized metal and cno species . after day 1 , our synthetic... | we discuss a new one - dimensional non - lte time - dependent radiative - transfer technique for the simulation of supernova ( sn ) spectra and light curves . starting from a hydrodynamical input characterizing the homologously - expanding ejecta at a chosen post - explosion time , we model the evolution of the _ entir... |
hep-ph0504165 | i | by now there is convincing evidence for solar and atmospheric neutrino oscillations . the @xmath4 values and mixing angles are known with fair accuracy @xcite . for @xmath4 we have : @xmath5 ev@xmath6 and @xmath7 ev@xmath6 . as for the mixing angles , two are large and one is small . the atmospheric angle @xmath0 is la... | we discuss a particularly symmetric model of neutrino mixings where , with good accuracy , the atmospheric mixing angle is maximal , and the solar angle satisfies ( harrison - perkins - scott ( hps ) matrix ) . we construct a model where the hps matrix is exactly obtained in a first approximation without imposing ad ho... | we discuss a particularly symmetric model of neutrino mixings where , with good accuracy , the atmospheric mixing angle is maximal , and the solar angle satisfies ( harrison - perkins - scott ( hps ) matrix ) . the discrete symmetry is a suitable symmetry group for the realization of this type of model . we construct a... |
hep-ph0504165 | c | there are by now several theoretical mechanisms that can qualitatively explain the observed large lepton mixing angles @xcite . they are sufficiently flexible to quantitatively accommodate the measured parameters . they are also compatible with our ideas on quarks masses and mixing angles so that they can be nicely emb... | we also show that , under general conditions , a maximal can never arise from an exact flavour symmetry . 0.5 cm * tri - bimaximal neutrino mixing from discrete symmetry in extra dimensions * 0.2 cm 0.5 cm guido altarelli + .1 cm cern , department of physics , theory division + ch-1211 geneva 23 , switzer... | we discuss a particularly symmetric model of neutrino mixings where , with good accuracy , the atmospheric mixing angle is maximal , and the solar angle satisfies ( harrison - perkins - scott ( hps ) matrix ) . the discrete symmetry is a suitable symmetry group for the realization of this type of model . we construct a... |
1110.3915 | i | the measurement of a very weak force such as the detection of gravitational wave demands a very high resolution interferometer . the role of the interferometer is to transform small variation of the relative spatial separation of the mirrors between two arms into variation of the output photons . quantum noise presumab... | the associated radiation pressure is described by a surface integral of the stress - tensor of the field . the read - out field is measured by a monople detector , form which the effective distance between the detector and mirror can be obtained . in the slow - motion limit of the mirror , we are able to identify vario... | we employ the field theoretic approach to study the quantum noise problem in the mirror - field system , where a perfectly reflecting mirror is illuminated by a single - mode coherent state of the massless scalar field . the associated radiation pressure is described by a surface integral of the stress - tensor of the ... |
1110.3915 | c | the problem of quantum noise in the mirror - field system has been studied in the field theoretic approach . we consider that a single , perfectly reflecting mirror is illuminated by a single - mode coherent state of a massless scalar field , in addition to ambient vacuum fluctuations . the net field is read out by a m... | we employ the field theoretic approach to study the quantum noise problem in the mirror - field system , where a perfectly reflecting mirror is illuminated by a single - mode coherent state of the massless scalar field . since the mirror is driven by radiation pressure , the sources of noise , other than the shot nose ... | we employ the field theoretic approach to study the quantum noise problem in the mirror - field system , where a perfectly reflecting mirror is illuminated by a single - mode coherent state of the massless scalar field . the associated radiation pressure is described by a surface integral of the stress - tensor of the ... |
1406.0437 | i | since markowitz ( 1952 ) presented his seminal work about portfolio selection , this topic has become a very fast growing branch of finance . one of markowitz s ideas was the minimization of the portfolio variance subject to the budget constraint . this approach leads to the well - known and frequently used portfolio ,... | its asymptotic properties are investigated assuming that the number of assets depends on the sample size such that as tends to infinity . this is also well - documented in a numerical study where the small- and large - sample behavior of the derived estimator are compared with existing estimators of the gmv portfolio .... | we estimate the global minimum variance ( gmv ) portfolio in the high - dimensional case using results from random matrix theory . this approach leads to a shrinkage - type estimator which is distribution - free and it is optimal in the sense of minimizing the out - of - sample variance . its asymptotic properties are ... |
1406.0437 | i | the global minimum variance portfolio plays an important role in investment theory and practice . this portfolio is widely used as an investment opportunity in both static and dynamic optimal portfolio choice problems . although an explicit analytical expression for the structure of the gmv portfolio weights is availab... | this approach leads to a shrinkage - type estimator which is distribution - free and it is optimal in the sense of minimizing the out - of - sample variance . the results are obtained under weak assumptions imposed on the distribution of the asset returns , namely it is only required the fourth moments existence . furt... | we estimate the global minimum variance ( gmv ) portfolio in the high - dimensional case using results from random matrix theory . this approach leads to a shrinkage - type estimator which is distribution - free and it is optimal in the sense of minimizing the out - of - sample variance . its asymptotic properties are ... |
astro-ph0301171 | i | the study of the tidally induced migration of protoplanets embedded in protoplanetary disks has received renewed attention in the last few years following the discovery of extrasolar giant planets ( hereafter egps ) . it is in particular the best candidate to explain the short period egps ( the so - called hot jupiters... | this leads to a positive feedback on the migrating planet . runaway migration is a good candidate to account for the orbital characteristics of close orbiting giant planets , most of which have sub - jovian masses . these are known to cluster at short periods whereas planets of greater than two jovian masses are rare a... | we evaluate the coorbital corotation torque on a migrating protoplanet . the coorbital torque is assumed to come from orbit crossing fluid elements which exchange angular momentum with the planet when they execute a u - turn at the end of horseshoe streamlines . when the planet migrates inward , the fluid elements of t... |
1307.6631 | i | quantum degenerate ultracold atomic sources have been used to study fundamental processes such as quantum phase transitions @xcite , quantum non - equilibrium thermodynamics @xcite and entanglement of massive particles @xcite . their ability to be highly isolated from their environment and controlled precisely by optic... | we examine the feasibility of creating and measuring large relative number squeezing in multicomponent trapped bose - einstein condensates . in the absence of multimode effects , this squeezing can be arbitrarily large for arbitrarily large condensates , but a range of processes limit the measurable squeezing in realis... | we examine the feasibility of creating and measuring large relative number squeezing in multicomponent trapped bose - einstein condensates . in the absence of multimode effects , this squeezing can be arbitrarily large for arbitrarily large condensates , but a range of processes limit the measurable squeezing in realis... |
1403.4900 | i | the quantum dynamics of a single qubit or central spin coupled to a spin environment @xcite has been widely studied theoretically in several different areas , including quantum information sciences @xcite , quantum decoherence @xcite , and excitation energy transfer @xcite . one of the most promising candidates for... | we examine the influence of environmental interactions on simple quantum systems by obtaining the exact reduced dynamics of a qubit coupled to a one - dimensional spin bath . next , we discuss the bath - induced decoherence of the qubit when the bath is initially in the ground state , and show that the decoherence prop... | we examine the influence of environmental interactions on simple quantum systems by obtaining the exact reduced dynamics of a qubit coupled to a one - dimensional spin bath . in contrast to previous studies , both the qubit - bath coupling and the nearest neighbor intrabath couplings are taken as the spin - flip xx - t... |
0805.1066 | i | astronomers around the world are making significant efforts to image planets in orbit around other stars beuzit07,nielsen07,lafreniere07,apai08 . work on suppressing the glare of potential parent stars has proceeded to the point where contrast ratios of @xmath7 can now typically be achieved on the telescope , and @xmat... | we examine the spectra and infrared colors of the cool methane - dominated atmospheres at k expected for young gas giant planets . ( 2007 ) giant planet thermal evolution models that include formation by core accretion - gas capture . these relatively cool `` young jupiters '' can be 1 - 6 magnitudes fainter than pred... | we examine the spectra and infrared colors of the cool methane - dominated atmospheres at k expected for young gas giant planets . we couple these spectral calculations to an updated version of the marley et al . ( 2007 ) giant planet thermal evolution models that include formation by core accretion - gas capture . t... |
0805.1066 | c | we have shown how metal enhanced atmospheres differ from their solar composition counterparts , in atmospheric structure , chemistry , spectra , and colors . we have applied these results to an updated version of the @xcite evolution models , which give cooling tracks for egps that are initially significantly colder th... | we couple these spectral calculations to an updated version of the marley et al . these metal - enhanced young jupiters have lower pressure photospheres than field brown dwarfs of the same effective temperatures arising from both lower surface gravities and enhanced atmospheric opacity . we highlight several diagnosti... | we examine the spectra and infrared colors of the cool methane - dominated atmospheres at k expected for young gas giant planets . we couple these spectral calculations to an updated version of the marley et al . ( 2007 ) giant planet thermal evolution models that include formation by core accretion - gas capture . t... |
astro-ph0611607 | i | we have elaborately investigated the relations among various internal ( e.g. color , luminosity , morphology , star formation rate , velocity dispersion , size , radial color gradient , and axis ratio ) and collective properties ( e.g. luminosity function , velocity dispersion distribution function , and axis ratio dis... | we morphologically classify galaxies using the three dimensional parameter space of color , color gradient , and concentration index . , we find that bright ( ) early type galaxies show very small dispersions in color , color gradient , concentration , size , and velocity dispersion . these dispersions increase at fain... | we examine volume - limited samples of galaxies drawn from the sloan digital sky survey to look for relations among internal and collective physical parameters of galaxies as faint as . the internal physical properties of interest include morphology , luminosity , color , color gradient , concentration , size , velocit... |
1103.3619 | i | it is generally accepted that the vast amount of continuum emission of type 1 active galactic nuclei ( agns ) in uv and optical wavelengths originates in the accretion disk surrounding a supermassive black hole , and the uv - optical variability found at the beginning of agn studies has been considered a powerful tool ... | all target qsos showed clear flux variations during the monitoring period 1998 , and the multi - epoch flux data in two different bands obtained on the same night showed a linear flux - to - flux relationship for all target qsos . assigning the flux in the longer wavelength to the x - axis in the flux - to - flux diagr... | we examine whether the spectral energy distribution of uv continuum emission of active galactic nuclei ( agns ) changes during flux variation . we used multi - epoch photometric data of qsos in the stripe 82 observed by the sloan digital sky survey ( sdss ) legacy survey and selected 10 bright qsos observed with high p... |
1103.3619 | c | @xcite examined the relationship between variability amplitude and the rest - frame wavelength of the uv - optical region from sdss two - epoch multi - band observations of about 25,000 qsos , and found a larger amplitude of variation at shorter wavelengths in the uv region of @xmath5 . in this section , the tracks of... | we examine whether the spectral energy distribution of uv continuum emission of active galactic nuclei ( agns ) changes during flux variation . the multi - epoch flux data in the flux - to - flux diagram were found to be consistent with the wavelength - dependent amplitude of variation presented in , which showed a lar... | we examine whether the spectral energy distribution of uv continuum emission of active galactic nuclei ( agns ) changes during flux variation . we used multi - epoch photometric data of qsos in the stripe 82 observed by the sloan digital sky survey ( sdss ) legacy survey and selected 10 bright qsos observed with high p... |
1405.2364 | i | in this paper we have explored both classical and quantum dynamics of a model potential exhibiting a caldera : that is , a shallow potential well with two pairs of symmetry related index one saddles associated with the entrance / exit channels . classical trajectory simulations at several different energies confirm the... | we explore both classical and quantum dynamics of a model potential exhibiting a caldera : that is , a shallow potential well with two pairs of symmetry related index one saddles associated with entrance / exit channels . classical trajectory simulations at several different energies confirm the existence of the ` dyna... | we explore both classical and quantum dynamics of a model potential exhibiting a caldera : that is , a shallow potential well with two pairs of symmetry related index one saddles associated with entrance / exit channels . classical trajectory simulations at several different energies confirm the existence of the ` dyna... |
1207.3879 | i | one of the key goals in modern cosmology is to study the formation of the first stars and galaxies at the end of the cosmic dark ages , and how they shaped the subsequent evolution of the universe ( barkana & loeb 2001 ; bromm & larson 2004 ; ciardi & ferrara 2005 ; bromm et al . 2009 ; loeb 2010 ) . the first , so - c... | we explore high - redshift gamma - ray bursts ( grbs ) as promising tools to probe pre - galactic metal enrichment . the circumburst density is roughly proportional to with values of about a few . in more massive halos , corresponding to the first galaxies , the density may be larger , . the resulting afterglow fluxes ... | we explore high - redshift gamma - ray bursts ( grbs ) as promising tools to probe pre - galactic metal enrichment . we utilize the bright afterglow of a population iii ( pop iii ) grb exploding in a primordial dwarf galaxy as a luminous background source , and calculate the strength of metal absorption lines that are... |
1207.3879 | i | in this paper , we develop a diagnostic to study pre - galactic metal enrichment in the vicinity of the first galaxies . specifically , we utilize the bright afterglow of a pop iii grb as a featureless background source , and calculate the strength of metal absorption lines that are imprinted by the first heavy elemen... | we utilize the bright afterglow of a population iii ( pop iii ) grb exploding in a primordial dwarf galaxy as a luminous background source , and calculate the strength of metal absorption lines that are imprinted by the first heavy elements in the intergalactic medium ( igm ) . to derive the grb absorption line diagno... | we explore high - redshift gamma - ray bursts ( grbs ) as promising tools to probe pre - galactic metal enrichment . we utilize the bright afterglow of a population iii ( pop iii ) grb exploding in a primordial dwarf galaxy as a luminous background source , and calculate the strength of metal absorption lines that are... |
0710.5345 | i | the work presented here improves and extends our previous results . first , expanded and improved data sets are considered : three supernova samples and one radio galaxy sample . the radio galaxy data set has 11 new sources , increasing its size to 30 sources , and the supernovae data sets have increased substantially ... | the good agreement indicates that general relativity provides an accurate description of the data on look - back time scales of about ten billion years . the effect of non - zero space curvature on is explored ; for a plausible range of values of the effect is small and causes a to shift to the redshift at which the un... | we extend and apply a model - independent analysis method developed earlier by daly & djorgovski to new samples of supernova standard candles , radio galaxy and cluster standard rulers , and use it to constrain physical properties of the dark energy as functions of redshift . similar results are obtained for the radio ... |
astro-ph9912026 | i | the dynamical state and mass distribution in the central regions of elliptical galaxies provide clues to the formation and evolutionary histories of these galaxies ( see merritt 1999 for a review ) . consequently , the existence of central black holes has been the target of intense scrutiny ( see kormendy & richstone ... | we fit axisymmetric 3-integral dynamical models to ngc 3379 using the line - of - sight velocity distribution obtained from hst / fos spectra of the galaxy center and ground - based long - slit spectroscopy along four position angles , with the light distribution constrained by wfpc2 and ground - based images . | we fit axisymmetric 3-integral dynamical models to ngc 3379 using the line - of - sight velocity distribution obtained from hst / fos spectra of the galaxy center and ground - based long - slit spectroscopy along four position angles , with the light distribution constrained by wfpc2 and ground - based images . we hav... |
astro-ph9912026 | r | for each model , the 702 observables ( 13 losvd bins at the 54 positions ) determine the total @xmath31 , given by @xmath48 where the @xmath49 s are the losvd bin heights for the model and the data and @xmath50 is the uncertainty from the 68% confidence band . as an example , figure 6 plots the losvds for both the dat... | we have fitted models with inclinations from 29 ( intrinsic galaxy type e5 ) to 90 ( intrinsic e1 ) and black hole masses from 0 to . the preferred inclination is 90 ( edge - on ) ; however , the constraints on allowed inclination are not very strong due to our assumption of constant _ m / l_ . the rotation rises... | we fit axisymmetric 3-integral dynamical models to ngc 3379 using the line - of - sight velocity distribution obtained from hst / fos spectra of the galaxy center and ground - based long - slit spectroscopy along four position angles , with the light distribution constrained by wfpc2 and ground - based images . we hav... |
astro-ph9912026 | c | the models in this paper depend primarily on the input black - hole mass , inclination , and m / l assumption . a difficulty is that different combinations of these variables can have similar appearances in the projected kinematics . for example , the inclination and the m / l variation both affect the fit at large rad... | the best - fit black hole masses range from , depending on inclination . the velocity ellipsoid of the best model is not consistent with either isotropy or a two - integral distribution function . along the major axis , the velocity ellipsoid becomes tangential at the innermost bin , radial in the mid - range radii , a... | we fit axisymmetric 3-integral dynamical models to ngc 3379 using the line - of - sight velocity distribution obtained from hst / fos spectra of the galaxy center and ground - based long - slit spectroscopy along four position angles , with the light distribution constrained by wfpc2 and ground - based images . we hav... |
1104.5622 | i | recently , we have been interested in a family of soft , long - range pair interactions that give rise to novel physical behaviors of many - particle systems including classical disordered ground states for a range of densities , negative thermal expansion , and vanishing normal - mode frequencies.@xcite this family of... | we generate inherent structures , local potential - energy minima , of the ``-space overlap potential '' in two - dimensional many - particle systems using a cooling and quenching simulation technique . the ground states associated with the-space overlap potential are stealthy ( _ i.e. , _ completely suppress single sc... | we generate inherent structures , local potential - energy minima , of the ``-space overlap potential '' in two - dimensional many - particle systems using a cooling and quenching simulation technique . the ground states associated with the-space overlap potential are stealthy ( _ i.e. , _ completely suppress single sc... |
astro-ph0411621 | i | we have carried a detailed abundance analysis for 21 elements in a sample of four rgb stars in the metal poor distant outer halo globular cluster ngc 7492([fe / h ] @xmath48 dex ) . the analyzed spectra , obtained with hires at the keck observatory , are of high dispersion ( r=@xmath3=35,000 ) . most elements show no ... | we have carried out a detailed abundance analysis for 21 elements in a sample of four rgb stars in the outer halo globular cluster ngc 7492 ( 25 kpc ) ; we find [ fe / h ] = dex inferred from fe i lines ( from fe ii ) using high dispersion ( r==35,000 ) spectra obtained with hires at the keck observatory . most ele... | we have carried out a detailed abundance analysis for 21 elements in a sample of four rgb stars in the outer halo globular cluster ngc 7492 ( 25 kpc ) ; we find [ fe / h ] = dex inferred from fe i lines ( from fe ii ) using high dispersion ( r==35,000 ) spectra obtained with hires at the keck observatory . most ele... |
1101.1607 | i | a measurement of the complete breakup of the atomic helium target by xuv radiation was achieved over @xmath3 years ago @xcite . since then , rapid developments in strong xuv light sources and momentum imaging techniques have made it possible to record all the reaction fragments , nuclei and electrons , in double photo... | the spatial coordinates and are discretized in a finite - element discrete - variable representation . the wave packet of the laser - driven two - electron system is propagated in time through an effective short iterative lanczos method to simulate the double ionization of the hydrogen molecule . for both symmetric and... | we have carried out calculations of the triple - differential cross section for one - photon double ionization of molecular hydrogen for a central photon energy of ev , using a fully _ ab initio _ , nonperturbative approach to solve the time - dependent schrdinger equation in prolate spheroidal coordinates . the spati... |
1101.1607 | r | for the nonsequential double - ionization process induced by one- or two - photon absorption , electronic correlation plays a dominant role , as the two photoelectrons must share the available excess energy @xmath190 . double ionization by a single photon would not occur at all if the two - electron atom or molecule we... | we observe that the dominant escape mode of the two photoelectrons dramatically depends upon the energy sharing . in the parallel geometry , when the ejected electrons are collected along the direction of the laser polarization axis , back - to - back escape is the dominant channel for strongly asymmetric energy sharin... | we have carried out calculations of the triple - differential cross section for one - photon double ionization of molecular hydrogen for a central photon energy of ev , using a fully _ ab initio _ , nonperturbative approach to solve the time - dependent schrdinger equation in prolate spheroidal coordinates . the spati... |
1101.1607 | i | we have presented calculations for one - photon double ionization of the hydrogen molecule at a photon energy of @xmath0 ev by solving the time - dependent schrdinger equation in prolate spheroidal coordinates . the triple - differential cross sections were extracted through the projection of the time - dependent wave... | we have carried out calculations of the triple - differential cross section for one - photon double ionization of molecular hydrogen for a central photon energy of ev , using a fully _ ab initio _ , nonperturbative approach to solve the time - dependent schrdinger equation in prolate spheroidal coordinates . | we have carried out calculations of the triple - differential cross section for one - photon double ionization of molecular hydrogen for a central photon energy of ev , using a fully _ ab initio _ , nonperturbative approach to solve the time - dependent schrdinger equation in prolate spheroidal coordinates . the spati... |
0804.0880 | c | several pieces of evidence for the interaction between the molecular outflow driven by fir 3 and fir 4 clump were found in our observations . the extent of the sw outflow lobe from fir 3 observed in the co ( 10 , 32 ) lines ( @xmath0 0.09 pc ) is shorter than that of the ne lobe ( @xmath0 0.19 pc ) . this suggests that... | furthermore , theco (=10 ) emission shows an l - shaped structure in the p - v diagram . these results imply presence of the shock due to the interaction between the molecular outflow driven by fir 3 and the dense gas associated with fir 4 . we suggest that the interaction between the molecular outflow from fir 3 and t... | we have carried out millimeter interferometric observations of the orion molecular cloud-2 ( omc-2 ) fir 3/4 region at an angular resolution of 3 - 7 with the nobeyama millimeter array ( nma ) in the hco (=10 ) ,co (=10 ) , sio (=0 ,=21 ) , and cs (=21 ) lines and in the 3.3 mm continuum emission . submillimeter single... |
0804.0880 | i | we have carried out high angular - resolution ( @xmath0 3@xmath1 - 7@xmath1 ) millimeter interferometric observations of omc-2 fir 3/4 with the nma in the h@xmath2co@xmath3 ( @xmath4=10 ) , @xmath5co ( @xmath4=10 ) , cs ( @xmath4=21 ) , and sio ( @xmath6=0 , @xmath4=21 ) lines as well as in the 3.3 mm continuum emissio... | we have carried out millimeter interferometric observations of the orion molecular cloud-2 ( omc-2 ) fir 3/4 region at an angular resolution of 3 - 7 with the nobeyama millimeter array ( nma ) in the hco (=10 ) ,co (=10 ) , sio (=0 ,=21 ) , and cs (=21 ) lines and in the 3.3 mm continuum emission . our nma observations... | we have carried out millimeter interferometric observations of the orion molecular cloud-2 ( omc-2 ) fir 3/4 region at an angular resolution of 3 - 7 with the nobeyama millimeter array ( nma ) in the hco (=10 ) ,co (=10 ) , sio (=0 ,=21 ) , and cs (=21 ) lines and in the 3.3 mm continuum emission . submillimeter single... |
1005.3619 | i | studies of galactic chemical evolution are dependent on accurately derived abundances of stars spanning all ages , populations , kinematics , masses , and metallicities . stars with masses @xmath7 are especially important given their dominance of the initial mass function ( imf ; e.g. , * ? ? ? abundance studies utiliz... | oxygen abundances of our pleiades sample derived from the high - excitation triplet have been previously shown to increase with decreasing , and a comparison with the abundances suggests that the over - excitation ( larger abundances derived from high excitation lines relative to low excitation lines ) and over - ioni... | we have derived fe abundances of 16 solar - type pleiades dwarfs by means of an equivalent width analysis of and lines in high - resolution spectra obtained with the hobby - eberly telescope and high resolution spectrograph . abundances derived from lines are larger than those derived from lines ( herein referred to as... |
1005.3619 | r | line - by - line abundances derived for each of our pleiades stars are listed in tables 2 4 , and the stellar mean abundances can be found in table 5 . the final mean abundances are given relative to solar values ( table 2 ) derived via an ew analysis of sky spectra obtained with the het / hrs as part of our observati... | abundances derived from lines are larger than those derived from lines ( herein referred to as over - ionization ) for stars with k , and the discrepancy ( = [ /h ] - [ /h ] ) increases dramatically with decreasing , reaching over 0.8 dex for the coolest stars of our sample . the pleiades joins the open clusters m34 ... | we have derived fe abundances of 16 solar - type pleiades dwarfs by means of an equivalent width analysis of and lines in high - resolution spectra obtained with the hobby - eberly telescope and high resolution spectrograph . abundances derived from lines are larger than those derived from lines ( herein referred to as... |
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