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astro-ph0506750 | r | equations ( 4 - 6 ) are used to estimate the stellar mass for the various scalings . for each scaling , a grid of 10 choices of the scaling constant are made : @xmath48 to 1.0 in steps of 0.1 relative to maximum disk , and for @xmath37 and @xmath38 values ranging from 0.2 to 2.0 in steps of 0.2 . the maximum disk sca... | i give fits of the form . presumably , the prescription that comes closest to the correct value will minimize the scatter in the relation . this relation holds over five decades in mass . there is a systematic dependence of the degree of maximality of disks on surface brightness . | i investigate the baryonic tully - fisher relation for a sample of galaxies with extended 21 cm rotation curves spanning the range . a variety of scalings of the stellar mass - to - light ratio are considered . for each prescription for , i give fits of the form . presumably , the prescription that comes closest to th... |
astro-ph0506750 | c | i have explored the baryonic tully - fisher relation for many choices of stellar mass - to - light ratios using a sample of high quality data spanning a large dynamic range in mass . i provide fits to the btf for each @xmath1 . there is a particular choice , based on the minimization of the scatter in the local mass - ... | i investigate the baryonic tully - fisher relation for a sample of galaxies with extended 21 cm rotation curves spanning the range . galaxy color , stellar fraction , and are correlated with each other and with , in the sense that more massive galaxies tend to be more evolved . high surface brightness galaxies typical... | i investigate the baryonic tully - fisher relation for a sample of galaxies with extended 21 cm rotation curves spanning the range . a variety of scalings of the stellar mass - to - light ratio are considered . for each prescription for , i give fits of the form . presumably , the prescription that comes closest to th... |
1512.01955 | i | in many geophysical applications , in particular in the petroleum industry and in hydrology , distributed parameter estimation problems are often solved by means of iterative ensemble kalman filters @xcite . the basic methodology is to introduce an artificial dynamical system , to supplement this with observations , an... | ensemble - based filtering methods have recently been used to solve inverse problems by introducing an artificial dynamical system . this opens up the possibility of using a range of other filtering methods , such as 3dvar and kalman based methods , to solve inverse problems , again by introducing an artificial dynamic... | ill - posed inverse problems are ubiquitous in applications . understanding of algorithms for their solution has been greatly enhanced by a deep understanding of the linear inverse problem . in the applied communities ensemble - based filtering methods have recently been used to solve inverse problems by introducing an... |
0809.3178 | i | the stellar absorption lines from the near - ir calcium triplet ( cat ) made their debut in the field of active galactic nuclei ( agn ) with the work of terlevich , daz & terlevich ( 1990 , hereinafter tdt ) . at that time , it was thought that the optical spectrum of seyfert 2s contained a featureless continuum ( fc )... | we analyze the cat strength ( ) , and kinematical products derived in that study , namely stellar ( ) and ionized gas ( ) velocity dispersions . our main results may be summarized as follows : ( 1 ) seyfert 2s show no sign of dilution in with respect to the values spanned by normal galaxies , even when optical absorpti... | in a former paper ( garcia - rissmann 2005 ; hereafter paper i ) , we have presented spectra of 64 active , 9 normal and 5 starburst galaxies in the region around the near - ir calcium triplet absorption lines ( cat ) and the [ siii] line . in the present paper we analyze the cat strength ( ) , and kinematical products... |
0809.3178 | i | in paper i we presented a spectroscopic atlas of 78 galaxies in the region of cat lines , and measured the equivalent widths of cat and [ siii]@xmath09069 lines , and stellar and gaseous velocity dispersions . in this paper we used these data , as other measurements , to investigate the cat strength and the kinematical... | in a former paper ( garcia - rissmann 2005 ; hereafter paper i ) , we have presented spectra of 64 active , 9 normal and 5 starburst galaxies in the region around the near - ir calcium triplet absorption lines ( cat ) and the [ siii] line . in the present paper | in a former paper ( garcia - rissmann 2005 ; hereafter paper i ) , we have presented spectra of 64 active , 9 normal and 5 starburst galaxies in the region around the near - ir calcium triplet absorption lines ( cat ) and the [ siii] line . in the present paper we analyze the cat strength ( ) , and kinematical products... |
astro-ph0209099 | i | the extreme properties of bl lac objects are explained in terms of relativistic beaming of the emission from a jet oriented close to the line of sight . this model implies the existence of a substantial ` parent population ' of sources whose jets are less favourably aligned , and it is widely accepted that this is the ... | in an earlier paper we presented nuclear x - ray flux densities , measured with _ rosat _ , for the b2 bright sample of nearby low - luminosity radio galaxies . in this paper galaxies : active x - rays : galaxies bl lacertae objects : general galaxies : jets | in an earlier paper we presented nuclear x - ray flux densities , measured with _ rosat _ , for the b2 bright sample of nearby low - luminosity radio galaxies . in this paper we construct a nuclear x - ray luminosity function for the b2 radio galaxies , and discuss the consequences of our results for models in which su... |
astro-ph0209099 | i | in this paper we have been trying to determine to what extent and under what assumptions b2 radio galaxies ( or , more accurately , the radio galaxy population represented by the b2 radio galaxies ) can be the parent population of two well - studied samples of bl lac objects ( the emss and 1-jy samples ) . following ea... | we construct a nuclear x - ray luminosity function for the b2 radio galaxies , and discuss the consequences of our results for models in which such radio galaxies are the parent population of bl lac objects . based on our observations of the b2 sample , we use monte carlo techniques to simulate samples of beamed radio ... | in an earlier paper we presented nuclear x - ray flux densities , measured with _ rosat _ , for the b2 bright sample of nearby low - luminosity radio galaxies . in this paper we construct a nuclear x - ray luminosity function for the b2 radio galaxies , and discuss the consequences of our results for models in which su... |
1309.7073 | i | many biological systems involve mobile or fixed charges , the electrostatic response of which is key to our understanding of the physical behavior of such systems . nucleic acids and many proteins are charged in physiologically relevant conditions . the interactions that arise from the presence of these charges are cru... | in biological and synthetic materials , many important processes involve charges that are present in a medium with spatially varying dielectric permittivity . to accurately understand the role of electrostatic interactions in such systems , it is important to take into account the spatial dependence of the permittivity... | in biological and synthetic materials , many important processes involve charges that are present in a medium with spatially varying dielectric permittivity . to accurately understand the role of electrostatic interactions in such systems , it is important to take into account the spatial dependence of the permittivity... |
1309.7073 | c | we have presented a variational formulation of electrostatics specifically designed to treat the problem of dielectric heterogeneities in charged systems . assuming only the condition of linear response , we constructed an energy functional that employs the polarization charge density as its sole variational field . th... | we develop a variational formulation of electrostatics to accurately investigate systems that exhibit this inhomogeneous dielectric response . we explore in detail the charged systems that exhibit sharp discontinuous change in dielectric permittivity , and we show that for this case our functional reduces to a function... | in biological and synthetic materials , many important processes involve charges that are present in a medium with spatially varying dielectric permittivity . to accurately understand the role of electrostatic interactions in such systems , it is important to take into account the spatial dependence of the permittivity... |
1505.07194 | i | conventional battery powered wireless communications systems require periodic recharging or replacement of the batteries , which incurs a high operation burden @xcite and can be cumbersome or even impossible ( e.g. , for biomedical devices implanted in the human body @xcite ) . recently , energy harvesting ( eh ) from ... | in energy harvesting ( eh ) relay networks , the _ coherent _ communication requires accurate estimation / tracking of the _ instantaneous _ channel state information ( csi ) which consumes extra power . as a remedy , we propose two _ noncoherent _ eh relaying protocols based on the amplify - and - forward ( af ) relay... | in energy harvesting ( eh ) relay networks , the _ coherent _ communication requires accurate estimation / tracking of the _ instantaneous _ channel state information ( csi ) which consumes extra power . as a remedy , we propose two _ noncoherent _ eh relaying protocols based on the amplify - and - forward ( af ) relay... |
1601.07331 | i | transition metal compounds ( tmcs ) , particularly in their nanostructured form , find applications in a diverse range of technological fields including photovoltaics and photocatalysis , magnetic storage and phosphorescent imaging.@xcite rational optimization of tmcs at the nanoscale requires an atomistic , quantum - ... | in non - self - consistent calculations of the total energy within the random - phase approximation ( rpa ) for electronic correlation , it is necessary to choose a single - particle hamiltonian whose solutions are used to construct the electronic density and non - interacting response function . here we investigate th... | in non - self - consistent calculations of the total energy within the random - phase approximation ( rpa ) for electronic correlation , it is necessary to choose a single - particle hamiltonian whose solutions are used to construct the electronic density and non - interacting response function . here we investigate th... |
astro-ph9706210 | c | the major axis measurements in ngc 253 pose an interesting problem . in fig . 6 , the `` rotation curve '' appears to flatten off before rising at a radius @xmath59 . this effect is seen for both the approaching and receding sides of the disk , with ( fig . 6@xmath60 ) or without ( fig . 6@xmath61 ) the correction for ... | it was anticipated that if the ambient radiation field is sufficiently strong , there exists a maximum radius beyond which the cold gas is unable to support itself against ionization . we have now succeeded in detecting ionized gas beyond the observed hi disk in spirals . here , we report on our findings for the sculpt... | in spiral galaxies , the hi surface density declines with increasing radius to a point where it is seen to truncate dramatically in the best observed cases . it was anticipated that if the ambient radiation field is sufficiently strong , there exists a maximum radius beyond which the cold gas is unable to support itsel... |
astro-ph9706210 | c | we have succeeded in detecting ionized gas at and beyond the hi cut - off radius in the nearby spiral galaxy , ngc 253 . this galaxy is a member of a small ensemble , the sculptor group , with a low internal dispersion and little or no associated hot medium . the detected emission measures of the and lines are suffic... | the hi disks in sculptor galaxies extend to only about 1.2 although we have detected ionized gas to the limits of our survey out to 1.4 . the detections confirm that the rotation curve continues to rise in ngc 253 , as it appears to do for other sculptor galaxies from the hi measurements , but there is a hint that th... | in spiral galaxies , the hi surface density declines with increasing radius to a point where it is seen to truncate dramatically in the best observed cases . it was anticipated that if the ambient radiation field is sufficiently strong , there exists a maximum radius beyond which the cold gas is unable to support itsel... |
1402.0195 | i | polymer knots and links ( see ref . @xcite for a definition of knots and links ) have been actively studied since the discovery of interlocked polymer rings in dna in 1961 by frisch and wasserman @xcite . after then , linked dna molecules were identified in hela cell in 1967 @xcite . it has also been found that the pr... | in the first part of this work a summary is provided of some recent experiments and theoretical results which are relevant in the research of systems of polymer rings in nontrivial topological conformations . next , some advances in modeling the behavior of single polymer knots are presented . the numerical simulations... | in the first part of this work a summary is provided of some recent experiments and theoretical results which are relevant in the research of systems of polymer rings in nontrivial topological conformations . next , some advances in modeling the behavior of single polymer knots are presented . the numerical simulations... |
1401.0265 | i | consider an observable , discrete - time stochastic process @xmath0 , @xmath1 , a latent and unobserved discrete - time stochastic process @xmath2 , @xmath3 , a parameter @xmath4 and i.i.d . sequence of random variables @xmath5 , @xmath6 , whose distribution can depend upon @xmath7 ( @xmath8 ) . this article is concer... | in the following article we consider approximate bayesian computation ( abc ) for certain classes of time series models . in particular , we focus upon scenarios where the likelihoods of the observations and parameter are intractable , by which we mean that one can not evaluate the likelihood even up - to a positive un... | in the following article we consider approximate bayesian computation ( abc ) for certain classes of time series models . in particular , we focus upon scenarios where the likelihoods of the observations and parameter are intractable , by which we mean that one can not evaluate the likelihood even up - to a positive un... |
0909.3349 | i | the acceleration of cosmic rays up to @xmath1 ev has been attributed to supernova explosions and tev emission is expected from the remnants @xcite . the standard diffusive shock particle acceleration ( dsa ) model has been successful in explaining emissions from most supernova remnants @xcite . investigations of accele... | in the leptonic scenario for tev emission from a few well - observed shell - type tev supernova remnants ( sttsnrs ) , very weak magnetic fields are inferred . if fast - mode waves are produced efficiently in the shock downstream , we show that they are viable agents for acceleration of relativistic electrons inferred ... | in the leptonic scenario for tev emission from a few well - observed shell - type tev supernova remnants ( sttsnrs ) , very weak magnetic fields are inferred . if fast - mode waves are produced efficiently in the shock downstream , we show that they are viable agents for acceleration of relativistic electrons inferred ... |
1512.02428 | i | neutron stars ( nss ) are compact rotating relativistic objects . rotation allows nss to harbor inertial oscillation modes , the most interesting representatives of which are r modes . as it was shown by @xcite and @xcite , in the absence of dissipation r modes are subject to a gravitational driven instability ( the cf... | in the recent papers by a new scenario describing evolution of rapidly rotating neutron stars in low - mass x - ray binaries was proposed . the scenario accounts for a resonant interaction of normal r modes with superfluid inertial modes at some specific internal stellar temperatures ( `` resonance temperatures '' ) . ... | in the recent papers by a new scenario describing evolution of rapidly rotating neutron stars in low - mass x - ray binaries was proposed . the scenario accounts for a resonant interaction of normal r modes with superfluid inertial modes at some specific internal stellar temperatures ( `` resonance temperatures '' ) . ... |
hep-ph9707380 | c | in a universe with domains which can have different values of some of the underlying parameters , life may only be able to develop in some of those domains . if this is the case , we would expect that the parameters of our domain should be typical of anthropically allowed range . if the anthropic principle accommodates... | the requirement that complex elements be formed suggests that the higgs vacuum expectation value must have a magnitude less than 5 times its observed value , for , baryon stability requires that , the planck mass . we conclude that the observed value of is reasonably typical of the anthropically allowed range , and tha... | in theories in which different regions of the universe can have different values of the the physical parameters , we would naturally find ourselves in a region which has parameters favorable for life . we explore the range of anthropically allowed values of the mass parameter in the higgs potential , . for , the requir... |
1606.04265 | i | the area of @xmath0-calculus has in the last twenty years served as a bridge between mathematics and physics . recently , there is a significant increase of activities in the area of @xmath0-calculus due to its applications in various fields such as mechanics , mathematics and physics . the definitions and notations of... | in this article , the 2-iterated-appell family is introduced . certain 2-iterated-appell and mixed type-special polynomials are considered as members of this family . the numbers related to these polynomials are obtained . the graphs of some 2-iterated-appell and mixed type-appell polynomials are drawn for different va... | in this article , the 2-iterated-appell family is introduced . certain 2-iterated-appell and mixed type-special polynomials are considered as members of this family . the numbers related to these polynomials are obtained . the determinant definitions for the 2-iterated-appell family and for the 2-iterated and mixed typ... |
1102.5241 | i | the following model for a random walk in a random environment can be found in the physics literature ; see anshelevic and vologodskii ( @xcite ) , alexander _ et al . _ ( @xcite ) , kawazu and kesten ( @xcite ) . let @xmath0 be a family of positive i.i.d . random variables and @xmath1 the @xmath2-algebra generated by t... | in this article , we merge celebrated results of kesten and spitzer [ _ z . wahrsch . verw . gebiete _ * 50 * ( 1979 ) 525 ] and kawazu and kesten [ _ j . stat . phys . _ * 37 * ( 1984 ) 561575 ] . a random walk performs a motion in an i.i.d . environment and observes an i.i.d . scenery along its path . the resulting l... | in this article , we merge celebrated results of kesten and spitzer [ _ z . wahrsch . verw . gebiete _ * 50 * ( 1979 ) 525 ] and kawazu and kesten [ _ j . stat . phys . _ * 37 * ( 1984 ) 561575 ] . a random walk performs a motion in an i.i.d . environment and observes an i.i.d . scenery along its path . we assume that ... |
1004.0095 | r | in this paper , we are interested in the convergence of a greedy algorithm for the minimization of high - dimensional nonlinear convex problems . we first introduce the general theoretical setting in which we prove the convergence , then describe two prototypical examples to which our analysis can be applied . thr... | we illustrate this method on a prototypical example for uncertainty propagation on the obstacle problem . universit paris est , cole des ponts - paristech , cermics , + 6 & 8 avenue blaise pascal + 77455 marne - la - valle cedex 2 + france + \{cances , ehrlachv , lelievre}@cermics.enpc.fr + keywords : greedy algo... | in this article , we present a greedy algorithm based on a tensor product decomposition , whose aim is to compute the global minimum of a strongly convex energy functional . we prove the convergence of our method provided that the gradient of the energy is lipschitz on bounded sets . the main interest of this method is... |
1004.0095 | c | in this article , we presented a greedy algorithm based on variable decomposition aiming at computing the global minimum of a strongly convex energy functional . we proved that , provided that the gradient of the energy is lipschitz on bounded sets , and that the hilbert spaces considered satisfy assumptions @xmath68 a... | in this article , we present a greedy algorithm based on a tensor product decomposition , whose aim is to compute the global minimum of a strongly convex energy functional . we prove the convergence of our method provided that the gradient of the energy is lipschitz on bounded sets . the main interest of this method is... | in this article , we present a greedy algorithm based on a tensor product decomposition , whose aim is to compute the global minimum of a strongly convex energy functional . we prove the convergence of our method provided that the gradient of the energy is lipschitz on bounded sets . the main interest of this method is... |
cond-mat0007338 | i | global optimization ( go ) is essentially a mathematical task . namely , for the class of go problems i will be particularly considering here , it is to find the absolute minimum ( or maximum ) of a cost function , @xmath0 , where @xmath1 belongs to a subset @xmath2 of euclidean n - space , @xmath3 @xcite , i.e.@xmath4... | in this chapter the physical aspects of the global optimization of the geometry of atomic clusters are elucidated . in particular , i examine the structural principles that determine the nature of the lowest - energy structure , the physical reasons why some clusters are especially difficult to optimize and how the bas... | in this chapter the physical aspects of the global optimization of the geometry of atomic clusters are elucidated . in particular , i examine the structural principles that determine the nature of the lowest - energy structure , the physical reasons why some clusters are especially difficult to optimize and how the bas... |
1702.05841 | i | an @xmath0th - order tensor @xmath1 is a multidimensional or @xmath0-way array , where @xmath2 is a field . a first - order tensor is a vector , a second - order tensor is a matrix , and tensors of order three or higher are called higher - order tensors . when @xmath3 , @xmath4 is called an @xmath5th - order , @xmath6-... | we show that the homotopy continuation method is guaranteed to compute a nonnegative eigenpair . additionally , using degree analysis a novel homotopy continuation method is proposed to compute an odd number of positive z - eigenpairs , and some numerical results are presented . continuation method , nonnegative ten... | in this paper , a homotopy continuation method for the computation of nonnegative z-/h - eigenpairs of a nonnegative tensor is presented . we show that the homotopy continuation method is guaranteed to compute a nonnegative eigenpair . additionally , using degree analysis , we show that the number of positive z - eigen... |
1303.6449 | i | due to their importance in theory and applications , fine potential theoretical properties of lvy processes have been under intense study recently . the transition density @xmath8 of a lvy process is the heat kernel of the generator of the process . however , the transition density ( if it exists ) of a general lvy pro... | in this paper , we consider a large class of purely discontinuous rotationally symmetric lvy processes . we establish sharp two - sided estimates for the transition densities of such processes killed upon leaving an open set . when is a-fat open set , the sharp two - sided estimates are given in terms of surviving prob... | in this paper , we consider a large class of purely discontinuous rotationally symmetric lvy processes . we establish sharp two - sided estimates for the transition densities of such processes killed upon leaving an open set . when is a-fat open set , the sharp two - sided estimates are given in terms of surviving prob... |
0809.2446 | i | current wireless standards ( e.g. , ieee 802.11n and 802.16e ) have adopted mimo techniques @xcite-@xcite to achieve the benefits of transmit diversity ( using space - time coding ) and high data rates ( using spatial multiplexing ) . they , however , harness only a limited potential of mimo benefits since they use onl... | the fact that we could show such good results for large stbcs like and stbcs from cyclic division algebras ( cda ) operating at spectral efficiencies in excess of 20 bps / hz ( even after accounting for the overheads meant for pilot based training for channel estimation and turbo coding ) establishes the effectiveness ... | in this paper , we present a low - complexity algorithm for detection in high - rate , non - orthogonal space - time block coded ( stbc ) large - mimo systems that achieve high spectral efficiencies of the order of tens of bps / hz . we also present a training - based iterative detection / channel estimation scheme for... |
0809.2446 | c | we presented a low - complexity algorithm for the detection of high - rate , non - orthogonal stbc large - mimo systems with tens of antennas that achieve high spectral efficiencies of the order of several tens of bps / hz . we also presented a training - based iterative detection / channel estimation scheme for such l... | in this paper , we present a low - complexity algorithm for detection in high - rate , non - orthogonal space - time block coded ( stbc ) large - mimo systems that achieve high spectral efficiencies of the order of tens of bps / hz . we also present a training - based iterative detection / channel estimation scheme for... | in this paper , we present a low - complexity algorithm for detection in high - rate , non - orthogonal space - time block coded ( stbc ) large - mimo systems that achieve high spectral efficiencies of the order of tens of bps / hz . we also present a training - based iterative detection / channel estimation scheme for... |
1004.2773 | i | full diversity and low decoding complexity have been considered as two fundamental properties which a good space - time block code ( stbc ) should possess for multiple - input multiple - output ( mimo ) wireless communications . the first orthogonal stbc ( ostbc ) was proposed by alamouti which can achieve full transmi... | the proposed codes can be applied to any number of transmit antennas and admit a low decoding complexity while achieving full diversity . for transmit antennas , in each codeword real and imaginary parts of complex information symbols are parsed into diagonal layers and then encoded , respectively . in particular , fo... | in this paper , we propose a systematic design of space - time block codes ( stbc ) which can achieve high rate and full diversity when the partial interference cancellation ( pic ) group decoding is used at receivers . the proposed codes can be applied to any number of transmit antennas and admit a low decoding comple... |
1004.2773 | c | in this paper , we proposed a systematic design of stbc that can achieve full diversity with the pic group decoding . by coding the real and imaginary parts of the complex symbols vector independently , the proposed code has a reduced pic group decoding complexity , which is equivalent to a joint decoding of @xmath3 re... | in this paper , we propose a systematic design of space - time block codes ( stbc ) which can achieve high rate and full diversity when the partial interference cancellation ( pic ) group decoding is used at receivers . with pic group decoding , it is shown that the decoding complexity can be reduced to a joint decodin... | in this paper , we propose a systematic design of space - time block codes ( stbc ) which can achieve high rate and full diversity when the partial interference cancellation ( pic ) group decoding is used at receivers . the proposed codes can be applied to any number of transmit antennas and admit a low decoding comple... |
0805.4047 | i | applications of phase - transforming materials such as shape memory alloys ( smas ) and shape memory polymers are very broad . for example , they have been used to make satellite dampers , golf club heads and snake - like robots and so on . in particular , these materials have been used to design many minimal surgery d... | the engineering stress - strain curve plotted from the asymptotic solutions can capture the key features of the curve measured in a few experiments ( e.g. , the stress drop , the stress plateau , and the small stress valley ) . also , an important feature of this work is that we consider the clamped end conditions , wh... | in this paper , we study phase transitions in a slender circular cylinder composed of a compressible hyperelastic material with a non - convex strain energy function . we aim to construct the asymptotic solutions based on an axisymmetrical three - dimensional setting and use the results to describe the key features ( i... |
0805.4047 | c | we consider phase transitions induced by axial tension / extension in a slender circular cylinder composed of a general compressible hyperelastic material with a non - convex strain energy function under clamped end conditions . in order to capture the macroscopic phenomena observed in the experiments by others , the p... | in this paper , we study phase transitions in a slender circular cylinder composed of a compressible hyperelastic material with a non - convex strain energy function . the difficult problem of the solution bifurcations of the governing nonlinear partial differential equations ( pde s ) is solved through a novel approac... | in this paper , we study phase transitions in a slender circular cylinder composed of a compressible hyperelastic material with a non - convex strain energy function . we aim to construct the asymptotic solutions based on an axisymmetrical three - dimensional setting and use the results to describe the key features ( i... |
gr-qc9901061 | i | in classical general relativity there are many solutions of einstein equations with closed timelike curves ( ctcs ) @xcite . however , some early calculations of vacuum polarization in spacetimes with ctcs indicated that the renormalized stress - energy tensor diverged at the cauchy horizon or the polarized hypersurfac... | in this paper time machines are constructed from anti - de sitter space . self - consistent vacua for a massless conformally coupled scalar field are found for these time machines , whose renormalized stress - energy tensors are finite and solve the semi - classical einstein equations . the extensions to electromagnet... | in this paper time machines are constructed from anti - de sitter space . one is constructed by identifying points related via boost transformations in the covering space of anti - de sitter space and it is shown that this misner - like anti - de sitter space is just the lorentzian section of the complex space const... |
gr-qc9901061 | c | from the covering space of anti - de sitter space , a misner - like anti - de sitter space can be constructed . this misner - like anti - de sitter space has ctcs but the regions with ctcs are separated from the regions without ctcs by chronology horizons . in the appropriate coordinates , this misner - like anti - ... | one is constructed by identifying points related via boost transformations in the covering space of anti - de sitter space and it is shown that this misner - like anti - de sitter space is just the lorentzian section of the complex space constructed by li , xu , and liu in 1993 . | in this paper time machines are constructed from anti - de sitter space . one is constructed by identifying points related via boost transformations in the covering space of anti - de sitter space and it is shown that this misner - like anti - de sitter space is just the lorentzian section of the complex space const... |
1204.5589 | i | in quantum information several entropic functionals ( the so called quantum capacities ) have been introduced that provide a sort of inverse measures " of the noise level associated with a given process , see e.g. refs . @xcite . in this approach the evolution of the system of interest @xmath1 is described as a linea... | in this paper we introduce a way to quantify the noise level associated to a given quantum transformation . the key mechanism lying at the heart of the proposal is _ noise addition _ : in other words we compute the amount of extra noise we need to add to the system , through convex combination with a reference noisy ma... | in this paper we introduce a way to quantify the noise level associated to a given quantum transformation . the key mechanism lying at the heart of the proposal is _ noise addition _ : in other words we compute the amount of extra noise we need to add to the system , through convex combination with a reference noisy ma... |
1204.5589 | c | in our analysis we have introduced two new functionals ( @xmath9 and @xmath11 ) that can be used to quantify the noise level of a map . these have been characterized in terms of general properties and have been explicitly evaluated for some class of channels . along the way we have also introduced the notion of amendab... | we also introduce the notion of entanglement - breaking channels of order ( i.e. maps which become entanglement - breaking after iterations ) , and the associated notion of amendable channels ( i.e. maps which can be prevented from becoming entanglement - breaking after iterations by interposing proper quantum transfor... | in this paper we introduce a way to quantify the noise level associated to a given quantum transformation . the key mechanism lying at the heart of the proposal is _ noise addition _ : in other words we compute the amount of extra noise we need to add to the system , through convex combination with a reference noisy ma... |
0903.0634 | i | understanding the activity of galaxies , their morphologies , and the interplay between the two are key problems in galaxy evolution and are tightly correlated with the problem of understanding whether such properties depend on the initial physical conditions of a galaxy ( e.g. , its mass ) or , rather , result from ev... | such evolution appears more substantial for less luminous systems , and is possibly the low - redshift tail of the downsizing in star - formation , agn activity and supermassive black hole build - up observed in higher redshift surveys.this suggests that the differences in intrinsic properties of galaxies along the hub... | in this second paper of a series of papers based on the first and sdss surveys we investigate the evolution of galaxy morphology and nuclear activity in the look - back time of the sdss ( 2 gyrs ) for a sample of 150000 galaxies in the local universe . we demonstrate an evolution in the strength of the radio power and... |
0903.0634 | c | in this study based on the sdss and first surveys , we have investigated the evolution of galaxy properties withing the sdss look - back time ( @xmath0 2 gyr ) for a sample of @xmath0 150000 galaxies in the local universe . we have shown a transformation of the activity and morphology of galaxies over the look - back t... | in this second paper of a series of papers based on the first and sdss surveys we investigate the evolution of galaxy morphology and nuclear activity in the look - back time of the sdss ( 2 gyrs ) for a sample of 150000 galaxies in the local universe . | in this second paper of a series of papers based on the first and sdss surveys we investigate the evolution of galaxy morphology and nuclear activity in the look - back time of the sdss ( 2 gyrs ) for a sample of 150000 galaxies in the local universe . we demonstrate an evolution in the strength of the radio power and... |
0906.0892 | i | this is work the second of a pair of articles on mesoscopic transport through chaotic quantum dots with spatial symmetries ( see ref . @xcite for part i ) . in both works we use recent advances in semiclassical techniques to address the effect of spatial symmetries on weak localization ( wl ) corrections and universa... | in this work the second of a pair of articles we consider transport through spatially symmetric quantum dots with leads whose widths or positions do not obey the spatial symmetry . finally , we develop a random - matrix theory model which enables us to numerically confirm these results . | in this work the second of a pair of articles we consider transport through spatially symmetric quantum dots with leads whose widths or positions do not obey the spatial symmetry . we use the semiclassical theory of transport to find the symmetry - induced contributions to weak localization corrections and universal ... |
1702.07762 | i | internal gravity waves play a primary role in geophysical fluids @xcite : they contribute significantly to mixing in the ocean @xcite and they redistribute energy and momentum in the middle atmosphere @xcite . the generation and propagation mechanisms are fairly well understood , as for instance in the case of oceani... | internal gravity waves play a primary role in geophysical fluids : they contribute significantly to mixing in the ocean and they redistribute energy and momentum in the middle atmosphere . until recently , most studies were focused on plane wave solutions . however , these solutions are not a satisfactory description o... | internal gravity waves play a primary role in geophysical fluids : they contribute significantly to mixing in the ocean and they redistribute energy and momentum in the middle atmosphere . until recently , most studies were focused on plane wave solutions . however , these solutions are not a satisfactory description o... |
1702.07762 | c | we have presented several recent experimental and theoretical works that have renewed the interest of internal wave beams . after emphasizing the reason for their ubiquity in stratified fluids they are solutions of the nonlinear governing equations this review has presented the two main mechanisms of instability for ... | we will discuss the reason for the ubiquity of wave beams in stratified fluids , related to the fact that they are solutions of the nonlinear governing equations . moreover , in light of recent experimental and analytical studies of internal gravity beams , it is timely to discuss the two main mechanisms of instability... | internal gravity waves play a primary role in geophysical fluids : they contribute significantly to mixing in the ocean and they redistribute energy and momentum in the middle atmosphere . until recently , most studies were focused on plane wave solutions . however , these solutions are not a satisfactory description o... |
astro-ph0509742 | i | lccccccc vdb - hagen 176 ( bh176 ) & 15:39:05.4 & @xmath950:03:01.7 & 328.4100 & @xmath104.3418 & 2.3 & 0.70 & 1 + berkeley 20 ( be20 ) & 05:32:37.0 & @xmath1000:11:30.0 & 203.4803 & @xmath917.3711 & 2.0 & 0.16 & 2 + berkeley 29 ( be29 ) & 06:53:04.2 & @xmath1016:55:39.0 & 197.9493 & @xmath107.9802 & 2.0 & 0.10 & 3 + b... | it has been previously proposed that some distant open clusters in the milky way may have been accreted during a dwarf galaxy merger , perhaps associated with the same event that led to the formation of the galactic anticenter stellar structure ( gass ) , also known as the `` monoceros ring '' . we have obtained and wa... | it has been previously proposed that some distant open clusters in the milky way may have been accreted during a dwarf galaxy merger , perhaps associated with the same event that led to the formation of the galactic anticenter stellar structure ( gass ) , also known as the `` monoceros ring '' . we have obtained and wa... |
astro-ph0509742 | r | the photometrically identified , most likely rgb and rc stars unambiguously reveal the bulk rv of each cluster , as shown by the rv distributions in the left panels ( a e ) of figure 4 . since these rgb and rc stars are the most likely to provide the `` purest '' samples of cluster members , we use these samples to de... | we provide the first _ reliable _ radial velocity for bh 176 ( km s ) . we also find that and km s , for saurer 1(a ) and berkeley 29 , respectively . we show that-enhanced isochrones , while spectroscopically motivated , provide a poor fit to be29 in contrast to previous findings . however , the radial velocity and p... | it has been previously proposed that some distant open clusters in the milky way may have been accreted during a dwarf galaxy merger , perhaps associated with the same event that led to the formation of the galactic anticenter stellar structure ( gass ) , also known as the `` monoceros ring '' . we have obtained and wa... |
astro-ph0008006 | i | seyfert nuclei are typical active galactic nuclei ( agns ) in the nearby universe . they have been broadly classified into two types based on presence or absence of broad emission lines in their optical spectra ( khachikian & weedman 1974 ) ; seyferts with broad lines are type 1 ( hereafter s1 ) while those without bro... | it is known that the spectral energy distribution ( sed ) of the nuclear radiation of narrow - line seyfert 1 galaxies ( nls1s ) has different shapes with respect to that of ordinary broad - line seyfert 1 galaxies ( bls1s ) , particularly in wavelengths of x - ray . , we have compiled the emission - line ratios of 36 ... | it is known that the spectral energy distribution ( sed ) of the nuclear radiation of narrow - line seyfert 1 galaxies ( nls1s ) has different shapes with respect to that of ordinary broad - line seyfert 1 galaxies ( bls1s ) , particularly in wavelengths of x - ray . this may cause some differences in the ionization de... |
1610.08004 | i | the concept of network coding came into light in the year 2000 by a seminal work of ahlswede _ et al._. in @xcite the authors showed that the min - cut bound in a multicast network can be achieved if the intermediate nodes are allowed to do operations on incoming messages before forwarding . this kind of operation of i... | it is known that there exists a multiple - unicast network which has a rate linear network coding solution if and only if the characteristic of the finite field belongs to a given finite or co - finite set of primes . in this paper , we show that for any non - zero positive rational number , there exists a multiple - u... | it is known that there exists a multiple - unicast network which has a rate linear network coding solution if and only if the characteristic of the finite field belongs to a given finite or co - finite set of primes . in this paper , we show that for any non - zero positive rational number , there exists a multiple - u... |
0911.1403 | i | an unsatisfactory feature of all theories of gravity is that the field equations do not have any direct physical interpretation . the lack of an elegant principle which can lead to the dynamics of gravity ( `` how matter tells spacetime to curve '' ) is quite striking when we compare this situation with the kinematics ... | this insight , in turn , leads us to the possibility of deriving the gravitational field equations from another variational principle without using the metric as a dynamical variable . i review this approach and discuss its implications . address = iucaa , pune university campus , + ganeshkhind , pune 411007 , indi... | it is possible to provide a thermodynamic interpretation for the field equations in any diffeomorphism invariant theory of gravity . this insight , in turn , leads us to the possibility of deriving the gravitational field equations from another variational principle without using the metric as a dynamical variable . i ... |
1012.4385 | i | although the standard model ( sm ) is successful in describing almost all experimental results of high energy physics in terms of gauge theory , the dynamics responsible for the elerctroweak symmetry breaking is unknown . in the minimal version of the higgs sector , one higgs doublet field is introduced as an effective... | lepton flavor violation in and processes is studied in the littlest higgs model with t parity . correlations among branching ratios and asymmetries are shown in the following lepton flavor violation processes : , , ( = al , ti , au and pb ) , , , , ( = , and ) , ( = , and ) , , , , , , and . it is shown that large pari... | lepton flavor violation in and processes is studied in the littlest higgs model with t parity . we consider various asymmetries defined in polarized and decays . correlations among branching ratios and asymmetries are shown in the following lepton flavor violation processes : , , ( = al , ti , au and pb ) , , , , ( = ,... |
math0402139 | i | let @xmath0 be a connected , linear algebraic group defined over @xmath1 , @xmath2 a @xmath18-dimensional vector space over @xmath3 with @xmath1-structure @xmath4 , and @xmath19 a @xmath1-rational representation of @xmath0 on @xmath2 with a zariski - dense @xmath0-orbit . the triple @xmath20 then represents a prehomoge... | let be a connected , linear algebraic group defined over , acting regularly on a finite dimensional vector space over with-structure . we consider the left regular representation of the group of-rational points on the banach space of continuous functions on vanishing at infinity , and study the convolution operators , ... | let be a connected , linear algebraic group defined over , acting regularly on a finite dimensional vector space over with-structure . assume that posseses a zariski - dense orbit , so that becomes a prehomogeneous vector space over . we consider the left regular representation of the group of-rational points on the ba... |
1011.5731 | i | i am very glad to submit a paper for the special issue of the journal of geometric mechanics in honour of tudor ratiu . i followed his scientific work for several years ; i specially praise the superb book he wrote with juan - pablo ortega @xcite . i hope that he will find some interest in the present work . the keple... | this result explains why the diffeomorphism of the phase space of the kepler problem restricted to the negative ( resp . two - sheeted hyperboloid ) , discovered by gyrgyi ( 1968 ) , re - discovered by ligon and schaaf ( 1976 ) , is a symplectic diffeomorphism . infinitesimal symmetries of the kepler problem are disc... | let be a hamiltonian vector field defined on a symplectic manifold , a nowhere vanishing smooth function defined on an open dense subset of . we will say that the vector field is _ conformally hamiltonian_. we prove that when is complete , when is hamiltonian with respect to another symplectic form defined on , and whe... |
1308.6497 | i | we start out with a few definitions from group theory . let @xmath4 be a group . we say that _ @xmath4 splits over the subgroup @xmath5 _ if @xmath4 admits an hnn decomposition with base group @xmath6 and amalgamating subgroup @xmath5 . more precisely , @xmath4 splits over the subgroup @xmath5 if there exists an isomor... | let be a knot of genus . if is fibered , then it is well known that the knot group splits only over a free group of rank . if is not fibered , then splits over every free group of rank at least . however , can not split over a group of rank less than . | let be a knot of genus . if is fibered , then it is well known that the knot group splits only over a free group of rank . we show that if is not fibered , then splits over non - free groups of arbitrarily large rank . furthermore , if is not fibered , then splits over every free group of rank at least . however , can ... |
math0211386 | i | take real polynomials @xmath18 $ ] and let @xmath19 , @xmath13 , be a continuous family of ovals . for sufficiently small @xmath20 and generic @xmath21 the limit cycles of the perturbed plane hamiltonian system @xmath22 which tend to certain ovals from the continuous family when @xmath23 , are in one - to - one corresp... | we show that the-dimensional real vector space of these integrals is not chebyshev in general : for any , there are hyperelliptic hamiltonians and continuous families of ovals , , such that the abelian integral can have at least - 1 $ ] zeros in . our main result is theorem [ main ] in which we show that when , excepti... | let be a real polynomial of degree , and be an oval contained in the level set . we study complete abelian integrals of the form where are real and is a maximal open interval on which a continuous family of ovals exists . we show that the-dimensional real vector space of these integrals is not chebyshev in general : fo... |
1701.07947 | i | suppose @xmath14 is an elliptic surface defined over a number field @xmath1 , so @xmath2 is a smooth projective curve and all but finitely many fibers @xmath15 , @xmath16 , are smooth elliptic curves . we let @xmath17 denote the nron - tate canonical height of @xmath18 viewed as an elliptic curve over the function fiel... | applying theorems of thuillier and yuan , we obtain the equidistribution of points where is torsion , and we give an explicit description of the limiting distribution on . finally , combined with results of masser and zannier , we show there is a positive lower bound on the height , after excluding finitely many points... | let be an elliptic surface defined over a number field , where is a smooth projective curve , and let be a section defined over with canonical height . in this article , we show that the function on is the height induced from an adelically metrized line bundle with non - negative curvature on . applying theorems of thu... |
1409.1486 | i | the thompson group @xmath0 is the group of homeomorphisms @xmath14\to[0,1]$ ] for which : * the endpoints satisfy @xmath15 , @xmath16 , * it is piecewise linear with finitely many break points on the diadic numbers @xmath17\cap ( 0,1)$ ] , * all slopes of @xmath18 are in the set @xmath19 . @xmath0 is a countable gro... | let denote the thompson group with standard generators , . it is a long standing open problem whether is an amenable group . by a result of kesten from 1959 , amenability of is equivalent to and to where in both cases the norm of an element in the group ring is computed in via the regular representation of . by extensi... | let denote the thompson group with standard generators , . it is a long standing open problem whether is an amenable group . by a result of kesten from 1959 , amenability of is equivalent to and to where in both cases the norm of an element in the group ring is computed in via the regular representation of . by extensi... |
1409.1486 | m | let @xmath30 be a discrete group and let @xmath125 be a finite set with @xmath187 elements ( @xmath188 ) . our main example will be @xmath109 , the thompson group , and @xmath57 either @xmath189 or @xmath97 , but we will for some time stick to the general case in order to treat the two particular cases in a similar way... | we obtain precise lower bounds for the norms in and , as well as good estimates of the spectral distributions of and of with respect to the tracial state on the group von neumann algebra . our computational results suggest , that it is however hard to obtain precise upper bounds for the norms , and our methods can not ... | let denote the thompson group with standard generators , . it is a long standing open problem whether is an amenable group . by a result of kesten from 1959 , amenability of is equivalent to and to where in both cases the norm of an element in the group ring is computed in via the regular representation of . by extensi... |
1506.05129 | c | ngc 1271 harbors a black hole with @xmath128 and has a stellar mass - to - light ratio of @xmath129 . we note that the final uncertainty on the black hole mass we use is comparable to the formal 3@xmath43 statistical uncertainty . some @xcite have suggested 3@xmath43 statistical errors should be used in place of 1@xmat... | we find that the galaxy is rapidly rotating and exhibits a sharp rise in the velocity dispersion . through the use of orbit - based stellar dynamical models , more compact , high - dispersion galaxies need to be studied using high spatial resolution observations to securely determine black hole masses , as there could ... | located in the perseus cluster , ngc 1271 is an early - type galaxy with a small effective radius of 2.2 kpc and a large bulge stellar velocity dispersion of 276 km s for its-band luminosity of . we present a mass measurement for the black hole in this compact , high - dispersion galaxy using observations from the inte... |
1506.05129 | c | to summarize , we obtained ao - assisted gemini nifs observations of ngc 1271 to map out the stellar kinematics on scales comparable to the black hole sphere of influence , and large - scale ifu data with ppak , which are useful for constraining the galaxy s stellar mass - to - light ratio and orbital distribution . us... | located in the perseus cluster , ngc 1271 is an early - type galaxy with a small effective radius of 2.2 kpc and a large bulge stellar velocity dispersion of 276 km s for its-band luminosity of . we are able to map out the stellar kinematics both on small spatial scales , within the black hole sphere of influence , and... | located in the perseus cluster , ngc 1271 is an early - type galaxy with a small effective radius of 2.2 kpc and a large bulge stellar velocity dispersion of 276 km s for its-band luminosity of . we present a mass measurement for the black hole in this compact , high - dispersion galaxy using observations from the inte... |
1312.5528 | i | viruses are the most numerous organisms on earth . they play diverse roles in the biotic component of practically any ecosystem . especially remarkable is the case of marine ecosystems . marine viruses are important sources of mortality at every trophic level . potential hosts range from whales and commercial fish spec... | they are , thus , a key determinant of the most important biogeochemical cycles in the planet . therefore , a correct description of the ecological and evolutionary behavior of these viruses is essential to make reliable predictions about their role in marine ecosystems . , the latter description is widely used as a si... | marine viruses shape the structure of the microbial community . they are , thus , a key determinant of the most important biogeochemical cycles in the planet . therefore , a correct description of the ecological and evolutionary behavior of these viruses is essential to make reliable predictions about their role in mar... |
1409.2385 | i | let @xmath13 and @xmath14 be symplectic manifolds . a _ symplectic embedding _ of @xmath13 into @xmath14 is a smooth embedding @xmath15 such that @xmath16 . it is interesting to ask when one symplectic manifold embeds into another . for example , define the ( open ) four - dimensional symplectic _ @xmath17 and define t... | mcduff and schlenk have recently determined exactly when a four - dimensional symplectic ellipsoid symplectically embeds into a symplectic ball . similarly , frenkel and mller have recently determined exactly when a symplectic ellipsoid symplectically embeds into a symplectic cube . symplectic embeddings of more compli... | mcduff and schlenk have recently determined exactly when a four - dimensional symplectic ellipsoid symplectically embeds into a symplectic ball . similarly , frenkel and mller have recently determined exactly when a symplectic ellipsoid symplectically embeds into a symplectic cube . symplectic embeddings of more compli... |
1611.05224 | c | in this paper , we have discussed the divergence based model adequacy tests and its link with some new divergence families . we have shown that the recent general family of the @xmath0-divergence can also be obtained from suitable model adequacy tests . we have also considered a more general model adequacy test based o... | we consider tubular model adequacy tests , and demonstrate that the new divergences that are generated in the process are very useful in robust statistical inference . in particular we show that family of-divergences can be alternatively developed using the tubular model adequacy tests ; a further application of the pa... | minimum divergence methods are popular tools in a variety of statistical applications . we consider tubular model adequacy tests , and demonstrate that the new divergences that are generated in the process are very useful in robust statistical inference . in particular we show that family of-divergences can be alternat... |
1401.8208 | c | in the present work we have used a reconstruction scheme for new holographic dark energy model with energy density given by @xmath168 in the framework of brans - dicke cosmology taking the ansatz @xmath169 . outcomes of the study are : * considering @xmath170 in the first modified field equation of bd theory leads t... | a _ , * 26 * , 191 ( 2011 ) , we report a study on the new holographic dark energy ( nhde ) model with energy density given by in the framework of chameleon brans - dicke cosmology . we have studied a correspondence between the quintessence , the dbi - essence and the tachyon scalar field models with the nhde model in ... | motivated by the work of yang et al . , _ mod . phys . lett . a _ , * 26 * , 191 ( 2011 ) , we report a study on the new holographic dark energy ( nhde ) model with energy density given by in the framework of chameleon brans - dicke cosmology . we have studied a correspondence between the quintessence , the dbi - essen... |
astro-ph0212354 | i | the giant region n66 is the largest , brightest star forming region in the small magellanic cloud ( smc ) . the populous star cluster ngc346 embedded in the nebula is home to several dozen early type stars including a dozen of spectral types o7 and earlier . two arcminutes to the east lies the massive , luminous wn+ob... | n66/ngc346 is the largest and brightest region in the small magellanic cloud and contains at least one known supernova remnant snr0057 . we also present high - resolution , long - slit h spectra across n66 showing high- and low - velocity emission corresponding closely to the x - ray boundaries of the supernova remna... | n66/ngc346 is the largest and brightest region in the small magellanic cloud and contains at least one known supernova remnant snr0057 . optical emission from the remnant is overwhelmed by the bright photoionized emission from the nebula , but the remnant has been detected by way of far ultraviolet absorption lines . ... |
astro-ph0212354 | c | the detection of emission as well as the kinematics present in the h@xmath1 echelle data imply the presence of a strong shock in n66 associated with snr0057@xmath07226 . the snr shock model was also favored by @xcite for the high velocity absorption towards hd5980 . detection of the front side of snr0057@xmath07226 ... | we find that ionizing photons from the many massive cluster stars nearby likely affect the ionization balance in the post - shock gas , hindering the production of lower - ionization and neutral species . we discuss the importance and inherent difficulty of searching for supernova remnants in or near bright regions an... | n66/ngc346 is the largest and brightest region in the small magellanic cloud and contains at least one known supernova remnant snr0057 . optical emission from the remnant is overwhelmed by the bright photoionized emission from the nebula , but the remnant has been detected by way of far ultraviolet absorption lines . ... |
astro-ph0212354 | i | we see strong emission in and at a position on the eastern x - ray edge of snr0057@xmath07226 . absorption in these same ions is seen at @xmath2300 km s@xmath7 toward the bright lbv system hd5980 which lies behind the remnant . another position away from the remnant but within the bright nebular extent of n66 shows... | optical emission from the remnant is overwhelmed by the bright photoionized emission from the nebula , but the remnant has been detected by way of far ultraviolet absorption lines . here we present data from the far ultraviolet spectroscopic explorer ( _ fuse _ ) satellite showing strong and emission from a position ... | n66/ngc346 is the largest and brightest region in the small magellanic cloud and contains at least one known supernova remnant snr0057 . optical emission from the remnant is overwhelmed by the bright photoionized emission from the nebula , but the remnant has been detected by way of far ultraviolet absorption lines . ... |
0809.1066 | i | in the study of the demographics of supermassive black holes , one important unresolved problem is the observational census of black holes in very late - type disk galaxies . the masses of supermassive black holes in elliptical and early - type spiral galaxies appear to be well correlated with the bulge properties of t... | ngc 3621 is a late - type ( sd ) spiral galaxy with an active nucleus , previously detected through mid - infrared [ ] line emission . archival _ hubble space telescope _ ( _ hst _ ) images reveal that the galaxy contains a bright and compact nuclear star cluster . we present a new high - resolution optical spectrum of... | ngc 3621 is a late - type ( sd ) spiral galaxy with an active nucleus , previously detected through mid - infrared [ ] line emission . archival _ hubble space telescope _ ( _ hst _ ) images reveal that the galaxy contains a bright and compact nuclear star cluster . we present a new high - resolution optical spectrum of... |
0809.1066 | i | our main conclusions are as follows . 1 . ngc 3621 has a seyfert 2 optical spectrum , consistent with the agn identification based on its mid - infrared spectrum by @xcite . this adds further support for the hypothesis that a black hole is present . 2 . for the nuclear star cluster , we find an effective radius of ... | the nucleus has a seyfert 2 emission - line spectrum at optical wavelengths , supporting the hypothesis that a black hole is present . the maximum black hole mass consistent with the measured stellar velocity dispersion is . if the black hole mass is small compared with the cluster s stellar mass , then the dynamical m... | ngc 3621 is a late - type ( sd ) spiral galaxy with an active nucleus , previously detected through mid - infrared [ ] line emission . archival _ hubble space telescope _ ( _ hst _ ) images reveal that the galaxy contains a bright and compact nuclear star cluster . we present a new high - resolution optical spectrum of... |
1502.04107 | i | different from other fundamental quantities such as mass and charge , spin is a dynamical quantity , and its dynamics have been widely studied and applied in science and technology . in particular , recent rapid growth of spintronics provides a stage where deeper understandings of spin dynamics directly lead to practic... | non - adiabatic contribution of environmental degrees of freedom yields effective inertia of spin in effective spin dynamics . in this paper , we study several aspects of the inertia of spin in metallic ferromagnets . ( ii ) dynamical behavior of spin with inertia , discussed from viewpoints of a spinning top and of a ... | non - adiabatic contribution of environmental degrees of freedom yields effective inertia of spin in effective spin dynamics . in this paper , we study several aspects of the inertia of spin in metallic ferromagnets . ( i ) a concrete expression of the spin inertia : , where is the spin polarization of conduction elect... |
1201.4965 | i | experimental data on high energy physics say that elementary particles are complex systems with internal degrees of freedom . fundamental particle which in certain relation can pretend to simplicity , on the one hand , and underlie all known interactions , on the other hand , is the electron . nonexistence of the elect... | the equation for energy , which is an integral of motion when satisfies to certain differential condition , is derived for the general case . for a free mass point all solutions of the equations of motion in the center - of - inertia reference frame , moving with constant velocity , are found . as a result , the center... | nonrelativistic formalism is developed , which allows describing systems with internal degrees of freedom in the scalar potential field , which is a function both on relative coordinates and time , and on relative speed and accelerations . the equation for energy , which is an integral of motion when satisfies to certa... |
astro-ph0309458 | i | in the past decade , observations of x - ray emission from accreting neutron stars and black holes have introduced new possibilities for astrophysical tests of fundamental physics . recent discoveries made by satellites such as asca , rxte , bepposax , chandra , and xmm - newton provide direct evidence for strong - fie... | using the exact geodesic equations for the kerr metric , we calculate the trajectories of massive test particles , which are treated as isotropic , monochromatic emitters in their rest frames . photons are traced from the accretion disk to a distant observer to produce time- and frequency - dependent images of the orbi... | observations from the rossi x - ray timing explorer have shown the existence of high frequency quasi - periodic oscillations ( hfqpos ) in the x - ray flux from accreting black hole binary systems . in at least two systems , these hfqpos come in pairs with a 2:3 frequency commensurability . we propose a simple `` hot s... |
0906.0588 | i | forming high - mass o and b stars with a surface temperature larger than @xmath1 k emit most of their radiation in far uv ( fuv ) wavelengths . after a not yet well defined point of the evolution , also x - rays are emitted . when still deeply embedded in their natal cloud , most of this high - energy radiation is abso... | observations of the high - mass star forming region afgl 2591 reveal a large abundance of co , a molecule known to be enhanced by far uv ( fuv ) and x - ray irradiation . in chemical models assuming a spherically symmetric envelope , the volume of gas irradiated by protostellar fuv radiation is very small due to the hi... | observations of the high - mass star forming region afgl 2591 reveal a large abundance of co , a molecule known to be enhanced by far uv ( fuv ) and x - ray irradiation . in chemical models assuming a spherically symmetric envelope , the volume of gas irradiated by protostellar fuv radiation is very small due to the hi... |
astro-ph0203041 | c | the early evolution ( within @xmath341 days ) of the light curves of sn 1999el indicates that this is one of the most rapidly declining type iin sn among those studied so far . it is useful to compare its features with those of sn 1998s , the other recent and extensively observed type iin sn ( fassia et al . 2000 ) ... | spectroscopic observations are also discussed . using as a distance calibrator the type ia sn 2000e , which occurred some months later in the same galaxy , and fitting a blackbody law to the photometric data we obtain a maximum bolometric luminosity for sn 1999el of erg s . in general , the photometric properties of s... | optical and near - infrared light curves of the type iin supernova 1999el in ngc 6951 are presented . a period of 220 days ( 416 days in the near - infrared ) is covered from the first observation obtained a few days before maximum light . spectroscopic observations are also discussed . using as a distance calibrator t... |
astro-ph0410065 | i | in rich clusters of galaxies , virial mass estimates agree well with independent determinations of the cluster mass made from the x - ray flux of hot intracluster gas , and from weak gravitational lensing effects . a typical ratio of the total mass - to - blue luminosity for rich clusters , @xmath9 , extrapolated over ... | over the last few years , rapid progress has been made in distance measurements for nearby galaxies based on the magnitude of the tip of red giant branch stars . the values of for the virialized groups turn out to be close each other , in the range of 0.9 1.3 mpc . as a result , | over the last few years , rapid progress has been made in distance measurements for nearby galaxies based on the magnitude of the tip of red giant branch stars . current ccd surveys with hst and large ground- based telescopes bring%-accurate distances for roughly a hundred galaxies within 5 mpc . the new data on distan... |
0809.2342 | c | in summary , we calculated the asymptotic forms of the pair - connection probability , the distributions of the total resistance and fractal masses of the backbone , the red bonds and the shortest , the longest and the average self - avoiding walk between any two points on a cluster . our analysis drew solely on genera... | our study includes the pair - connection probability , the distributions of the fractal masses of the backbone , the red bonds and the shortest , the longest and the average self - avoiding walk between any two points on a cluster , as well as the distribution of the total resistance in the random resistor network . ou... | percolation clusters are random fractals whose geometrical and transport properties can be characterized with the help of probability distribution functions . using renormalized field theory , we determine the asymptotic form of various of such distribution functions in the limits where certain scaling variables become... |
nucl-th9701032 | i | one of the oldest but still most challenging problems of nuclear physics is an adequate description of collective motion at finite excitations . as the prime example one may quote nuclear fission which has attracted the attention of both experimentalists as well as theoreticians since its discovery . to date it is stil... | previous computations of the potential landscape with the shapes parameterized in terms of cassini ovaloids are extended to collective dynamics at finite excitations . taking fission as the most demanding example of large scale collective motion , transport coefficients are evaluated along a fission path . their expres... | previous computations of the potential landscape with the shapes parameterized in terms of cassini ovaloids are extended to collective dynamics at finite excitations . taking fission as the most demanding example of large scale collective motion , transport coefficients are evaluated along a fission path . we concentra... |
astro-ph0610205 | i | to date , seven papers have been published providing listings and finding charts for faint uv - bright sources identified on plates from the sandage two - color survey of the galactic plane . the most recently published paper , paper vii ( @xcite ) , included proper motions for many of the sources found using informati... | proper motions with values mas yr or mas yr have been extracted from the usno - b1.0 and tycho ii catalogues for all lanning uv - bright sources identified in the sandage two - color survey of the galactic plane and presented in papers i - vi . of the 572 sources examined , we find at least 213 which exhibit a signific... | proper motions with values mas yr or mas yr have been extracted from the usno - b1.0 and tycho ii catalogues for all lanning uv - bright sources identified in the sandage two - color survey of the galactic plane and presented in papers i - vi . of the 572 sources examined , we find at least 213 which exhibit a signific... |
q-bio0603014 | i | critical to understanding how information is processed in the brain is the form of the neural coding that underlies the storage and recall of memories . is there a local , or gnostic @xcite , code colloquially called a grandmother - cell ( gm - cell ) representation in which the firing of a single neuron ( or group o... | quian quiroga et al . [ nature * 435 * , 1102 ( 2005 ) ] have recently discovered neurons that appear to have the characteristics of grandmother ( gm ) cells . here we quantitatively assess the compatibility of their data with the gm - cell hypothesis . we quantify the strong biases against detection of gm cells , and... | quian quiroga et al . [ nature * 435 * , 1102 ( 2005 ) ] have recently discovered neurons that appear to have the characteristics of grandmother ( gm ) cells . here we quantitatively assess the compatibility of their data with the gm - cell hypothesis . we show that , contrary to the general impression , a gm - cell r... |
q-bio0603014 | c | the results of @xcite clearly suggest the detection of grandmother cells in the classic sense . many other experiments have detected individual cells with strikingly specific responses ( e.g. , @xcite ) . therefore it is useful to hypothesize that some of these cells are indeed gm - like cells , even though the concept... | we present a general method to deduce the sparsity distribution of the whole neuronal population from a sample , and use it to show there are two populations of cells : a distributed - code population of less than about 5% of the cells , and a much more sparsely responding population of putative gm cells . with an allo... | quian quiroga et al . [ nature * 435 * , 1102 ( 2005 ) ] have recently discovered neurons that appear to have the characteristics of grandmother ( gm ) cells . here we quantitatively assess the compatibility of their data with the gm - cell hypothesis . we show that , contrary to the general impression , a gm - cell r... |
astro-ph0601716 | i | the current generation of ground - based interferometers , such as the palomar testbed interferometer ( pti ) @xcite , the naval prototype optical interferometer ( npoi)@xcite , the infrared optical telescope array ( iota3)@xcite , and the center for high angular resolution in astronomy ( chara ) array @xcite , is adva... | radial velocities from the 2.1 m telescope at mcdonald observatory supplemented with radial velocities from the coud feed telescope at kpno provide new precise orbits for the double - lined spectroscopic binaries rr lyn ( a3/a8/a6 ) , 12 boo ( f8iv ) , and hr 6169 ( a2v ) . our analysis of hr 6169 has produced a ma... | radial velocities from the 2.1 m telescope at mcdonald observatory supplemented with radial velocities from the coud feed telescope at kpno provide new precise orbits for the double - lined spectroscopic binaries rr lyn ( a3/a8/a6 ) , 12 boo ( f8iv ) , and hr 6169 ( a2v ) . we derive orbital dimensions ( and ) and m... |
astro-ph0601716 | r | all three systems have eccentric orbits , so we obtained simultaneous solutions of the primary and secondary radial velocities by the lehmann filhes method to determine the orbits . a preliminary to the orbit calculation was the assignment of suitable weights for the various velocities . typically the primary and seco... | the three systems , which have magnitudes of 5.54 , 4.83 , and 6.42 , respectively , are all sufficiently bright that they are easily within the grasp of modern optical interferometers and so afford the prospect , when our spectroscopic observations are complemented by interferometric observations , of fully - determin... | radial velocities from the 2.1 m telescope at mcdonald observatory supplemented with radial velocities from the coud feed telescope at kpno provide new precise orbits for the double - lined spectroscopic binaries rr lyn ( a3/a8/a6 ) , 12 boo ( f8iv ) , and hr 6169 ( a2v ) . we derive orbital dimensions ( and ) and m... |
astro-ph0612461 | i | recent estimates of the kerr parameters @xmath0 for two soft x - ray transients ( sxts ) @xcite , gro j1655@xmath140 ( nova sco ) and 4u 1543@xmath147 ( il lupi ) , facilitate a test of stellar evolution , in that the spins of the black holes in these binaries should be produced in common envelope evolution which begin... | recent measurements of the kerr parameters for two black - hole binaries in our galaxy , gro j1655 and 4u 1543 of and , respectively , fitted well the predictions of , of . in this report we also note that predicted for 80% of the soft x - ray transient sources . the maximum available energy in the blandford - znajek f... | recent measurements of the kerr parameters for two black - hole binaries in our galaxy , gro j1655 and 4u 1543 of and , respectively , fitted well the predictions of , of . in this report we also note that predicted for 80% of the soft x - ray transient sources . the maximum available energy in the blandford - znajek f... |
1202.2874 | i | the origin of ultra - high - energy cosmic rays ( uhecrs ) with energies @xmath7 ev is an intriguing mystery in modern astrophysics . their sources are generally believed to be extragalactic objects , although some galactic objects may also be viable . in either case , the maximum energy of @xmath8 ev can only be achie... | recent results from the pierre auger observatory ( pao ) indicate that the composition of ultra - high - energy cosmic rays ( uhecrs ) with energies above ev may be dominated by heavy nuclei . we have simulated the propagation of uhecr nuclei including models for both the extragalactic magnetic field ( egmf ) and the g... | recent results from the pierre auger observatory ( pao ) indicate that the composition of ultra - high - energy cosmic rays ( uhecrs ) with energies above ev may be dominated by heavy nuclei . an important question is whether the distribution of arrival directions for such uhecr nuclei can exhibit observable anisotropy... |
1202.2874 | c | we have investigated the anisotropy in the arrival directions of uhecr nuclei and their positional correlations with source objects , on the basis of propagation calculations conducted under various assumptions for the source properties and cosmic magnetic fields . although @xmath20 ev was fiducially assumed in the pre... | an important question is whether the distribution of arrival directions for such uhecr nuclei can exhibit observable anisotropy or positional correlations with their astrophysical source objects despite the expected strong deflections by intervening magnetic fields . for this purpose , assuming that only iron nuclei ar... | recent results from the pierre auger observatory ( pao ) indicate that the composition of ultra - high - energy cosmic rays ( uhecrs ) with energies above ev may be dominated by heavy nuclei . an important question is whether the distribution of arrival directions for such uhecr nuclei can exhibit observable anisotropy... |
hep-th9504007 | i | the classical and quantum propagation of strings in curved spacetimes has attracted a great deal of interest in recent years . the main complication , as compared to the case of flat minkowski spacetime , is related to the non - linearity of the equations of motion . it makes it possible to obtain the complete analytic... | recent results on classical and quantum strings in a variety of black hole and cosmological spacetimes , in various dimensions , are presented . furthermore , using a canonical quantization procedure , we find the string mass spectrum in de sitter and anti de sitter spacetimes . we discuss the physical implications of ... | recent results on classical and quantum strings in a variety of black hole and cosmological spacetimes , in various dimensions , are presented . the curved backgrounds under consideration include the black hole anti de sitter spacetime and its dual , the black string , the ordinary black holes with or without a cosmolo... |
gr-qc9801036 | i | we were very much surprised when we learned during the 8@xmath2 marcel grossmann meeting in jerusalem @xcite that kaniel & itin @xcite were able to propose a gravitational model which looks viable at a first sight even if it had neither an einstein - hilbert type of lagrangian nor the schwarzschild metric as an exact s... | recently kaniel & itin proposed a gravitational model with the wave type equation\vartheta^\alpha=0 $ ] as vacuum field equation , where denotes the coframe of spacetime . they found that the viable yilmaz - rosen metric is an exact solution of the tracefree part of their field equation . this model belongs to the _ te... | recently kaniel & itin proposed a gravitational model with the wave type equation\vartheta^\alpha=0 $ ] as vacuum field equation , where denotes the coframe of spacetime . they found that the viable yilmaz - rosen metric is an exact solution of the tracefree part of their field equation . this model belongs to the _ te... |
1407.5484 | i | during mitosis , the cell equally divides into two daughter cells , each getting a copy of the original genetic material . successful division requires that the two identical sister chromatids of mitotic chromosomes attach to the plus - ends of spindle microtubules ( mts ) via their kinetochores @xcite . this process i... | here we introduce and simulate a mechanical model of mt - kinetochore interactions in which the stability of the attachment is ruled by the geometrical conformations of curling mt - protofilaments entangled in kinetochore fibrils . the model allows us to reproduce with good accuracy in vitro experimental measurements o... | regulating the stability of microtubule(mt)-kinetochore attachments is fundamental to avoiding mitotic errors and ensure proper chromosome segregation during cell division . while biochemical factors involved in this process have been identified , its mechanics still needs to be better understood . here we introduce an... |
0806.2658 | i | in this paper we have carried out a synoptic analysis of the different observational features that have to do with the uv luminosity excess in elliptical galaxies . as far as the canonical picture is assumed , with old stellar populations dominating early - type galaxy luminosity , the appearence of the `` uv upturn ''... | we find that the uv - upturn actually signals a profound change in the c - m diagram of stellar populations in elliptical galaxies , involving both the hot stellar component and red - giant evolution . first , we encounter that the strengthening of the uv rising branch is always seen to correspond to a shortening in ag... | relying on infrared surface brightness fluctuactions to trace agb properties in a sample of elliptical galaxies in the virgo and fornax clusters , we assess the puzzling origin of the `` uv - upturn '' phenomenon , recently traced down to the presence of a hot horizontal branch ( hb ) stellar component . we find that t... |
hep-ph0606106 | i | gauge theories on spaces with noncommuting coordinates , @xmath2=i\,\theta^{\mu\nu } \ , \ ] ] provide a very interesting new class of quantum field theories with intriguing and sometimes unexpected features . these noncommutative models can arise naturally as low - energy effective theories from string theory and d - ... | we pay particular attention to overall trace - u(1 ) factors of the gauge group which are affected by the ultraviolet / infrared mixing . unobservable would require making the effects of noncommutativity tiny , . this severely limits the phenomenological prospects of such models . however , adding additional universal ... | restrictions imposed by gauge invariance in noncommutative spaces together with the effects of ultraviolet / infrared mixing lead to strong constraints on possible candidates for a noncommutative extension of the standard model . we study a general class of noncommutative models consistent with these restrictions . spe... |
hep-ph0606106 | c | noncommutative gauge symmetry in the weyl - moyal approach leads to two main features which have to be taken into account for sensible model building . first , there are strong constraints on the dynamics and the field content . the only allowed gauge groups are u(@xmath6 ) . in addition , the matter fields are restric... | restrictions imposed by gauge invariance in noncommutative spaces together with the effects of ultraviolet / infrared mixing lead to strong constraints on possible candidates for a noncommutative extension of the standard model . typically , these trace - u(1 ) gauge fields do not decouple sufficiently fast in the infr... | restrictions imposed by gauge invariance in noncommutative spaces together with the effects of ultraviolet / infrared mixing lead to strong constraints on possible candidates for a noncommutative extension of the standard model . we study a general class of noncommutative models consistent with these restrictions . spe... |
physics0702192 | i | blackbody radiation ( bbr ) is known to strongly affect the populations of atoms in highly excited rydberg states @xcite . it has also been shown that at the ambient temperature of 300 k bbr can photoionize rydberg atoms with @xmath1 at astonishingly high rates ( @xmath2 ) @xcite . strong effect of bbr on rydberg at... | results of theoretical calculations of ionization rates of rb and na rydberg atoms by blackbody radiation ( bbr ) are presented . calculations have been performed for _ n__=8 - 65 and at three ambient temperatures of 77 , 300 and 600 k. a peculiarity of our calculations is that we take into account the contributions o... | results of theoretical calculations of ionization rates of rb and na rydberg atoms by blackbody radiation ( bbr ) are presented . calculations have been performed for _ _ n__s , _ _ n__p and _ _ n__d states of na and rb , which are commonly used in a variety of experiments , at principal quantum numbers _ _ n__=8 - 65 ... |
physics0702192 | c | we have calculated the total bbr - induced ionization rates of na and rb _ _ n__s , _ _ n__p and _ _ n__d rydberg states for principal quantum numbers _ _ n__=8 - 65 at the ambient temperatures of 77 , 300 and 600 k. our calculations take into account the effect of bbr - induced mixing of rydberg states and their fiel... | the obtained results show that these phenomena affect both the magnitude of measured ionization rates and shapes of their dependences on _ n_. the calculated ionization rates are compared with the results of our earlier measurements of bbr - induced ionization rates of na _ _ n__s and _ _ n__d rydberg states with _ | results of theoretical calculations of ionization rates of rb and na rydberg atoms by blackbody radiation ( bbr ) are presented . calculations have been performed for _ _ n__s , _ _ n__p and _ _ n__d states of na and rb , which are commonly used in a variety of experiments , at principal quantum numbers _ _ n__=8 - 65 ... |
hep-ex9905041 | c | we have measured the optical properties of seventy - four pure cesium iodide crystals that were polished and wrapped in the diffuse teflon reflector . the results are summarized separately for the full - sized and half - sized crystals in tables [ tab1 ] and [ tab2 ] . the deduced light yields parameterized by two ax... | seventy - four individual crystals , polished and wrapped in teflon foil , were examined in a multiwire drift chamber system specially designed for transmission cosmic muon tomography . imposing the 5 mev calorimeter veto cut to suppress the electromagnetic losses , geant - evaluated positron and photon lineshape tail ... | scintillation properties of pure csi crystals used in the shower calorimeter being built for precise determination of the decay rate are reported . seventy - four individual crystals , polished and wrapped in teflon foil , were examined in a multiwire drift chamber system specially designed for transmission cosmic muon... |
1401.1183 | i | suppose @xmath2 is a real - valued , @xmath0th - order , @xmath1-dimensional tensors and @xmath8 is a real - valued @xmath1-vector . we let @xmath9 denote the @xmath1-vector defined by @xmath10 we let @xmath11 denote the scalar defined by @xmath12 . we say the tensor @xmath2 is _ symmetric _ if its entries are invarian... | several tensor eigenpair definitions have been put forth in the past decade , but these can all be unified under generalized tensor eigenpair framework , introduced by chang , pearson , and zhang ( 2009 ) . different choices for yield different versions of the tensor eigenvalue problem . we present our generalized eige... | several tensor eigenpair definitions have been put forth in the past decade , but these can all be unified under generalized tensor eigenpair framework , introduced by chang , pearson , and zhang ( 2009 ) . giventh - order ,-dimensional real - valued symmetric tensors and , the goal is to find and such that . different... |
cond-mat0311362 | c | before concluding this paper , it is intructive to compare effective ac susceptibilities of @xmath0-(bedt - ttf)@xmath204khg(scn)@xmath2 determined using different methods in fig . [ comparison ] . in fig [ comparison]a , @xmath208 is obtained by fitting the bean model ( as described above- see eq . [ beanman ] ) to m... | the data show that two types of screening currents occur within the high - field , low - temperature cdw phases of these salts in response to time - dependent magnetic fields . the first , which gives rise to the induced hall potential , is a free current ( ) , present at the surface of the sample . the time constant f... | single crystals of the organic charge - transfer salts-(bedt - ttf)hg(scn) have been studied using hall - potential measurements (k ) and magnetization experiments ( k , rb ) . the data show that two types of screening currents occur within the high - field , low - temperature cdw phases of these salts in response to ... |
astro-ph9912207 | i | soft gamma ray repeaters ( sgrs ) are neutron stars whose multiple bursts of gamma rays distinguish them from other gamma ray burst sources ( e.g @xcite for a recent review ) . sgrs are also unusual x ray pulsars in that they have spin periods clustered in the interval @xmath2 s , and they all appear to be associat... | soft gamma ray repeaters ( sgrs ) and anomalous x ray pulsars ( axps ) are young and radio - quiet x - ray pulsars which have been rapidly spun - down to slow spin periods clustered in the range s. most of these unusual pulsars also appear to be associated with supernova shell remnants ( snrs ) with typical ages kyr ... | soft gamma ray repeaters ( sgrs ) and anomalous x ray pulsars ( axps ) are young and radio - quiet x - ray pulsars which have been rapidly spun - down to slow spin periods clustered in the range s. most of these unusual pulsars also appear to be associated with supernova shell remnants ( snrs ) with typical ages kyr ... |
astro-ph9912207 | i | we have shown that soft gamma ray repeaters ( sgrs ) and anomalous x ray pulsars ( axps ) are born in regions of the interstellar medium which are denser than the environments typical of young neutron stars . this suggests that the development of sgrs and axps may be related to their environments , and we examine the... | we explore the implications of this evidence on magnetar and propeller - based models for the rapid spin - down of sgrs and axps . we find that evidence of dense environments is not consistent with the magnetar model unless a causal link can be shown between the development of magnetars and the external ism . propeller... | soft gamma ray repeaters ( sgrs ) and anomalous x ray pulsars ( axps ) are young and radio - quiet x - ray pulsars which have been rapidly spun - down to slow spin periods clustered in the range s. most of these unusual pulsars also appear to be associated with supernova shell remnants ( snrs ) with typical ages kyr ... |
1208.1381 | i | understanding the processes by which molecules and particles on surfaces absorb and scatter electromagnetic radiation is an area of considerable scientific importance . information may be needed because of an intrinsic desire to study surface physics , because an active surface forms part of an electronic device , or b... | spatial interferometry , based on the measurement of total absorbed power , can be used to determine the state of coherence of the electromagnetic field to which any energy - absorbing structure is sensitive . the measured coherence tensor can be diagonalized to give the amplitude , phase , polarization patterns , and ... | spatial interferometry , based on the measurement of total absorbed power , can be used to determine the state of coherence of the electromagnetic field to which any energy - absorbing structure is sensitive . the measured coherence tensor can be diagonalized to give the amplitude , phase , polarization patterns , and ... |
1403.5813 | i | in recent years , the interest in plastic electronics has grown considerably . the realization of devices such as organic field - effect transistors ( ofet ) represents a key step in this field . single - crystal ofet made of ultrapure small molecule semiconductors are characterized by mobilities up to one order of mag... | spectral and transport properties of small molecule single - crystal organic semiconductors have been theoretically analyzed focusing on oligoacenes , in particular on the series from naphthalene to rubrene and pentacene aiming to show that the inclusion of different electron - phonon couplings is of paramount importan... | spectral and transport properties of small molecule single - crystal organic semiconductors have been theoretically analyzed focusing on oligoacenes , in particular on the series from naphthalene to rubrene and pentacene aiming to show that the inclusion of different electron - phonon couplings is of paramount importan... |
1403.5813 | c | in this review , we have theoretically analyzed the effects of different electron - phonon couplings on spectral and transport properties of small molecule single - crystal organic semiconductors . focus has been on oligoacenes , in particular on the series from naphthalene to rubrene and pentacene . first , we have di... | + for rubrene , a very accurate analysis in the relevant experimental configuration has allowed to clarify the origin of the temperature dependent mobility observed in these organic semiconductors . with increasing temperature , the chemical potential moves into the tail of the density of states corresponding to locali... | spectral and transport properties of small molecule single - crystal organic semiconductors have been theoretically analyzed focusing on oligoacenes , in particular on the series from naphthalene to rubrene and pentacene aiming to show that the inclusion of different electron - phonon couplings is of paramount importan... |
1310.2283 | i | spectral methods have been used recently for solving partial differential equations on the unit disk , unit ball , or other domains with cylindrical or spherical geometry . their increasing popularity on these domains lies partially in various applications in earth sciences , disk or sphere shaped mirrors and lenses , ... | spectral approximation by polynomials on the unit ball is studied in the frame of the sobolev spaces , . the main results give sharp estimates on the order of approximation by polynomials in the sobolev spaces and explicit construction of approximating polynomials . one major effort lies in understanding the structure ... | spectral approximation by polynomials on the unit ball is studied in the frame of the sobolev spaces , . the main results give sharp estimates on the order of approximation by polynomials in the sobolev spaces and explicit construction of approximating polynomials . one major effort lies in understanding the structure ... |
astro-ph0007354 | i | the cold dark matter plus cosmological constant model ( @xmath0cdm ) appears to be remarkably successful in describing cosmology on scales much larger than a mpc ( e.g. bahcall , ostriker , perlmutter & steinhardt 1999 ) . however recent observations on smaller scales find @xmath0cdm wanting : @xmath0cdm predicts dwarf... | a generalized form of the navarro , frenk and white profile ( zhao profile ) may be used to describe these halos . in this paper we examine gravitational lensing statistics for this class of model . we find that lensing statistics based on profile parameters obtained from fits out to the virial radius are dependent ... | strong lensing is a powerful probe of the distribution of matter in the cores of clusters of galaxies . recent studies suggest that the cold dark matter model predicts cores that are denser than those observed in galaxies , groups and clusters . one possible resolution of the discrepancy is that the dark matter has str... |
astro-ph0007354 | c | we have calculated the differential and total optical depths to multiple imaging , the average image splitting and the total magnification for a constant co - moving number density of unevolving generalized nfw ( zhao ) profile cluster mass gravitational lenses . we find that the number of expected strongly lensed quas... | strong lensing is a powerful probe of the distribution of matter in the cores of clusters of galaxies . however the resulting increased magnification bias does not alter our conclusions . however our preliminary calculations suggest that the additional multiple imaging rate is small with respect to the differences i... | strong lensing is a powerful probe of the distribution of matter in the cores of clusters of galaxies . recent studies suggest that the cold dark matter model predicts cores that are denser than those observed in galaxies , groups and clusters . one possible resolution of the discrepancy is that the dark matter has str... |
1111.4959 | i | a. b. migdal s contribution to modern theoretical physics is very impressive . his endowment in and deep understanding of different domains of physics , including the nuclear and many - body physics , based on fermi - liquid approach , is outstanding . in migdal seminal papers a solid base for studying strongly interac... | strongly correlated fermi systems are among the most intriguing , best experimentally studied and fundamental systems in physics . there is , however , lack of theoretical understanding in this field of physics . the ideas based on the concepts like kondo lattice and involving quantum and thermal fluctuations at a quan... | strongly correlated fermi systems are among the most intriguing , best experimentally studied and fundamental systems in physics . there is , however , lack of theoretical understanding in this field of physics . the ideas based on the concepts like kondo lattice and involving quantum and thermal fluctuations at a quan... |
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