Split (3)

train · 4.78k rows

Subsets and Splits

No community queries yet

The top public SQL queries from the community will appear here once available.

article_id stringlengths 9 15	section_id stringclasses 5 values	document stringlengths 503 67.8k	summary stringlengths 205 16.2k	abstract stringlengths 293 26.7k
astro-ph0211175	r	in this section we analyze the synthesis of the 512 @xmath66 512 stokes spectra calculated from the dynamo simulation described in [ sec_mhd ] . we only use the numerical solution at one instant since the purpose of the work is to study the kind of spectra characterizing the stationary state of the simulation ( studie...	the synthetic stokes profiles have properties in common with those observed in the quiet sun . the intensity profiles are broadened by the magnetic fields in fair agreement with observational limits . differences between synthetic and observed polarized spectra can also be found . there is a shortage of stokes asymmetr...	we employ the magnetic and velocity fields from turbulent dynamo simulations to synthesize the polarization of a typical photospheric line . the synthetic stokes profiles have properties in common with those observed in the quiet sun . the simulated magnetograms present a level of signal similar to that of the inter - ...
1205.4429	i	we study the well - posedness of two - dimensional steady supersonic euler flows past a curved lipschitz wall containing strong vortex sheets / entropy waves in the @xmath2norm . the inviscid compressible flows are governed by the two - dimensional steady euler system : @xmath3 with @xmath4 , @xmath5 , @xmath6 , and @x...	we establish the well - posedness of compressible vortex sheets and entropy waves in two - dimensional steady supersonic euler flows over lipschitz walls under a boundary perturbation . in particular , when the total variation of the incoming flow perturbation around the background strong vortex sheet / entropy wave is...	we establish the well - posedness of compressible vortex sheets and entropy waves in two - dimensional steady supersonic euler flows over lipschitz walls under a boundary perturbation . in particular , when the total variation of the incoming flow perturbation around the background strong vortex sheet / entropy wave is...
1001.4991	c	our first conclusion , in agreement with other work , is that pm simulations are inefficient for calculating cmb lensing due to strongly nonlinear structures ( see fig . [ fig2 ] and comments in section [ comparison ] ) . while it is not impossible to simulate these effects with a pm code the required resolution is so...	we estimate the impact of weak lensing by strongly nonlinear cosmological structures on the cosmic microwave background . the lensing deviations are evaluated while structure evolves during the simulation so that all evolution steps rather than just a few outputs are used in the lensing computations . the new code al...	we estimate the impact of weak lensing by strongly nonlinear cosmological structures on the cosmic microwave background . accurate calculation of large multipoles requires n - body simulations and ray - tracing schemes with both high spatial and temporal resolution . to this end we have developed a new code that combin...
1310.0560	c	radiative efficiencies of the disk accretion processes in individual qsos are related to the spins of the central mbhs , which may be profoundly connected to the mbh assembly history as suggested by a number of recent studies ( e.g. , * ? ? ? * ; * ? ? ? * ; * ? ? ? * ; * ? ? ? * ; * ? ? ? * ; * ? ? ? it is therefore o...	we estimate the radiative efficiency of individual type 1 sdss qsos by using their bolometric luminosities ( ) and accretion rates ( ) , which may be related to the assembly histories and spins of the central massive black holes ( mbhs ) . we estimate by using the empirical spectral energy distributions of qsos and by ...	we estimate the radiative efficiency of individual type 1 sdss qsos by using their bolometric luminosities ( ) and accretion rates ( ) , which may be related to the assembly histories and spins of the central massive black holes ( mbhs ) . we estimate by using the empirical spectral energy distributions of qsos and by ...
1502.06508	i	apart from hierarchical structure of massive neutrinos a fundamental qualitative nature of these elusive particles whether they are dirac or majorana type is yet unknown . neutrinoless double beta decay ( @xmath7 ) mode is able to discriminate between the two different types . positive evidence of the above experimenta...	we find them interesting as they allow us to evaluate each majorana phase in a model independent way even if one eigenvalue is zero . utilizing the solution of a general complex symmetric mass matrix for eigenvalues and mixing angles we determine the majorana phases for both the hierarchies , normal and inverted , taki...	we evaluate the majorana phases for a general complex symmetric neutrino mass matrix on the basis of mohapatra - rodejohann s phase convention using the three rephasing invariant quantities , and proposed by sarkar and singh . we find them interesting as they allow us to evaluate each majorana phase in a model independ...
hep-ph9304234	c	in this paper we examined in some detail the computation of false vacuum decay rates at finite temperatures in the regime in which quantum fluctuations are negligibly small compared to thermal fluctuations . we have shown that temperature corrections to the nucleation barrier can be obtained from a saddle - point evalu...	we examine the computation of the nucleation barrier used in the expression for false vacuum decay rates in finite temperature field theory . by a detailed analysis of the determinantal prefactor we compute the nucleation barrier for a model of scalar fields coupled to fermions , and compare our results to the expressi...	we examine the computation of the nucleation barrier used in the expression for false vacuum decay rates in finite temperature field theory . by a detailed analysis of the determinantal prefactor , we show that the correct bounce solution used in the computation of the nucleation barrier should not include loop correct...
astro-ph0312216	i	according to the popular cosmological models dominated by cold dark matter ( cdm ) , the formation of large galaxies occurs in a hierarchical fashion , through the coalescence of smaller systems ( blumenthal et al . 1984 ; navarro , frenk , & white 1997 ; klypin , nolthenius , & primack 1997 ) . during mergers , the di...	previous work has indicated that the background uv flux can easily ionize the gas within typical dwarf galaxies , delaying or even preventing cooling and star formation within them . , we consider the dynamical evolution of gas in dwarf galaxies using a one - dimensional , spherically symmetric , lagrangian numerical s...	we examine the star formation history and stellar feedback effects of dwarf galaxies under the influence of extragalactic ultraviolet radiation . previous work has indicated that the background uv flux can easily ionize the gas within typical dwarf galaxies , delaying or even preventing cooling and star formation withi...
astro-ph0312216	i	in this paper , we consider a series of one - dimensional numerical models to examine the efficiency of star formation in dwarf galaxies under the influence of local cooling , heating by uv photons from both the background radiation and hot stars , and the winds and supernovae associated with massive stars . radiative ...	we examine the star formation history and stellar feedback effects of dwarf galaxies under the influence of extragalactic ultraviolet radiation . since the density scale height of the gas within these galaxies is comparable to their size , gas may be tidally removed from them , leaving behind starless residual dark mat...	we examine the star formation history and stellar feedback effects of dwarf galaxies under the influence of extragalactic ultraviolet radiation . previous work has indicated that the background uv flux can easily ionize the gas within typical dwarf galaxies , delaying or even preventing cooling and star formation withi...
0904.2137	i	one of the most important unresolved questions in particle physics is how exactly the electroweak symmetry is broken . the standard model higgs mechanism provides ample motivation to come up with alternatives . an interesting new possibility is provided by higgsless models @xcite with a warped extra dimension @xcite ...	1.5 cm * a flavor protection for warped higgsless models * 0.2 cm * csaba cski and david curtin * _ institute for high energy phenomenology + newman laboratory of elementary particle physics + cornell university , ithaca , ny 14853 , usa _	we examine various possibilities for realistic 5d higgsless models and construct a full quark sector featuring next - to - minimal flavor violation ( with an exact bulk protecting the first two generations ) satisfying electroweak and flavor constraints . the `` new custodially protected representation '' is used for t...
0904.2137	c	[ s.conclusion ] we examined various possibilities for higgsless rs model - building , and constructed a model with next - to - minimal flavor violation satisfying tree - level electroweak precision and meson - mixing constraints , as well as cdf bounds . the theory has a sufficiently high cutoff of @xmath304 to unitar...	we examine various possibilities for realistic 5d higgsless models and construct a full quark sector featuring next - to - minimal flavor violation ( with an exact bulk protecting the first two generations ) satisfying electroweak and flavor constraints . a combination of flavor symmetries , and rs - gim for the right ...	we examine various possibilities for realistic 5d higgsless models and construct a full quark sector featuring next - to - minimal flavor violation ( with an exact bulk protecting the first two generations ) satisfying electroweak and flavor constraints . the `` new custodially protected representation '' is used for t...
cond-mat9910079	i	excitons in semiconductor crystals @xcite and nanostructures @xcite,@xcite are a very interesting and challenging object to search for the process of bose - einstein condensation ( bec ) . nowadays there is a lot of experimental evidence that the optically inactive para - excitons in cu@xmath0o can form a highly correl...	we explore a nonlinear field model to describe the interplay between the ability of excitons to be bose - condensed and their interaction with other modes of a crystal . we calculate the condensate wave function and energy , and a collective excitation spectrum in the semiclassical approximation ; the inside - excitati...	we explore a nonlinear field model to describe the interplay between the ability of excitons to be bose - condensed and their interaction with other modes of a crystal . we apply our consideration to the long - living para - excitons in cuo . taking into account the exciton - phonon interaction and introducing a cohere...
1111.0883	i	the possible existence of a neutral weakly coupled light spin-@xmath6 gauge @xmath0-boson @xcite , which is originated from supersymmetric extensions of the standard model with an extra @xmath7 symmetry , has recently attracted much attention due to its multifaceted influences in particle physics , nuclear physics , as...	three methods , i.e. , the thermodynamical approach , the curvature matrix approach and the vlasov equation approach are used to determine the transition density with the skyrme effective nucleon - nucleon interactions . we find that the and depend on not only the ratio of coupling strength to mass squared of the-boson...	we explore effects of the light vector-boson , which is weakly coupled to nucleons , on the transition density and pressure at the inner edge separating the liquid core from the solid crust of neutron stars . three methods , i.e. , the thermodynamical approach , the curvature matrix approach and the vlasov equation app...
0810.5126	i	a wide variety of cosmological observations seem to point to a two - component dark sector , in which approximately 73% of the energy density of the universe is in dark energy and 23% is in non - baryonic dark matter ( dm ) . ordinary matter constitutes the remaining 4% @xcite . the physics of the dark matter sector is...	we explore the feasibility and astrophysical consequences of a new long - range gauge field ( `` dark electromagnetism '' ) that couples only to dark matter , not to the standard model . the dark matter consists of an equal number of positive and negative charges under the new force , but annihilations are suppressed i...	we explore the feasibility and astrophysical consequences of a new long - range gauge field ( `` dark electromagnetism '' ) that couples only to dark matter , not to the standard model . the dark matter consists of an equal number of positive and negative charges under the new force , but annihilations are suppressed i...
1507.00882	i	observations show recurrent formation and reshuffling of cool and dense material in coronal loops . the small scale ( @xmath2 km ) coronal rain is observed as cold , dense elongated blob - like features condensing in a much hotter loop and descending along one of its legs . the rain is guided by the loop magnetic field...	we quantify how in - situ forming blob - like condensations grow along and across field lines and show that rain showers can occur in limit cycles , here demonstrated for the first time in 2.5d setups . we discuss dynamical , multi - dimensional aspects of the rebound shocks generated by the siphon inflows and quantify...	we extend our earlier multidimensional , magnetohydrodynamic simulations of coronal rain occurring in magnetic arcades with higher resolution , grid - adaptive computations covering a much longer ( hour ) timespan . we quantify how in - situ forming blob - like condensations grow along and across field lines and show t...
1507.00882	r	in our previous work @xcite , we already described the formation process for the first condensation and emphasized how it perturbed the overall force balance in a 2d fashion . in this work , we discuss more of the multi - dimensional details for the forming condensations , and compare the results of our 2.5d simulation...	we point out the correlation between condensation rates and the cross - sectional size of loop systems where catastrophic cooling takes place . we also study the variations of the typical number density , kinetic energy and temperature while blobs descend , impact and sink into the transition region . in addition , we ...	we extend our earlier multidimensional , magnetohydrodynamic simulations of coronal rain occurring in magnetic arcades with higher resolution , grid - adaptive computations covering a much longer ( hour ) timespan . we quantify how in - situ forming blob - like condensations grow along and across field lines and show t...
1207.0109	i	a beautiful consequence of mike freedman s disk embedding theorem is the existence of non - smoothable @xmath0-manifolds . in the easiest setting , his result can be stated as follows . [ thm : classification ] any odd unimodular symmetric form @xmath1 is realized as the intersection form of exactly _ two _ closed simp...	we first remind the reader of a simple geometric description of the kirby - siebenmann invariant of a 4manifold in terms of a quadratic refinement of its intersection form . this is the first in a sequence of higher - order intersection invariants of whitney towers , studied by the authors , particularly for the 4ball ...	we first remind the reader of a simple geometric description of the kirby - siebenmann invariant of a 4manifold in terms of a quadratic refinement of its intersection form . this is the first in a sequence of higher - order intersection invariants of whitney towers , studied by the authors , particularly for the 4ball ...
1305.0729	i	let @xmath2 and consider the @xmath1 hypergeometric differential equation @xmath3 where @xmath4 and @xmath5 . assuming , as we do , that @xmath6 , @xmath7 , and the @xmath8 s and @xmath9 s are distinct , the @xmath10-functions @xmath11 where @xmath12 denotes omit @xmath13 , are linearly independent solutions to ( [ deq...	we give a criterion which ensures that a group generated by cartan involutions in the automorph group of a rational quadratic form of signature is `` thin '' , namely it is of infinite index in the latter . the criterion is shown to be robust for showing that many hyperbolic hypergeometric groups for are thin .	we give a criterion which ensures that a group generated by cartan involutions in the automorph group of a rational quadratic form of signature is `` thin '' , namely it is of infinite index in the latter . it is based on a graph defined on the integral cartan root vectors , as well as vinberg s theory of hyperbolic re...
0811.1085	i	the purpose of the present paper is two - fold . first of all , we would like to give an introduction to the beautiful combinatorics related with box - ball systems , and secondly , to relate the latter with the `` classical combinatorics '' revolving around transportation matrices , tabloids , the lascoux schtzenberg...	we give several equivalent combinatorial descriptions of the space of states for the box - ball systems , and connect certain partition functions for these models with the-weight multiplicities of the tensor product of the fundamental representations of the lie algebra . as an application , we give an elementary proof ...	we give several equivalent combinatorial descriptions of the space of states for the box - ball systems , and connect certain partition functions for these models with the-weight multiplicities of the tensor product of the fundamental representations of the lie algebra . as an application , we give an elementary proof ...
0904.1448	i	over the course of the past few decades , li abundances have been measured for many metal - poor main - sequence turn - off stars , in hopes of placing constraints on the nature of big bang nucleosynthesis ( bbn ) . the first such investigation , by @xcite , revealed that warm metal - poor main - sequence stars exhibit...	effective temperatures are determined by a profile analysis of h and h . while seven stars have li abundances as high as the spite plateau value , the remaining four objects with [ fe / h ] have(li )(li / h) , confirming the existence of extremely metal - poor turn - off stars having low li abundances , as reported by ...	we have determined li abundances for eleven metal - poor turn - off stars , among which eight have [ fe / h ] , based on lte analyses of high - resolution spectra obtained with the hds on the subaru telescope . the li abundances for four of these eight stars are determined for the first time by this study . effective t...
0904.1448	c	figure [ fig : life ] shows the li abundances as a function of [ fe / h ] for our sample and others . values of @xcite and @xcite are adopted without any correction . the solar fe abundance adopted by @xcite is 7.51 , while that of @xcite is determined by their own analysis of the solar spectrum . @xcite also reported...	the average of the li abundances for stars with [ fe / h] is lower by 0.2 dex than that of the stars with higher metallicity . no clear constraint on the metallicity dependence or scatter of the li abundances is derived from our measurements for the stars with [ fe / h] .	we have determined li abundances for eleven metal - poor turn - off stars , among which eight have [ fe / h ] , based on lte analyses of high - resolution spectra obtained with the hds on the subaru telescope . the li abundances for four of these eight stars are determined for the first time by this study . effective t...
1211.3440	r	figures 1 - 3 present our narrow - band nir images . our h@xmath0 2.12-@xmath4 , h@xmath0 2.25-@xmath4 , [ ] , and continuum - subtracted line images are shown in figure 1 . figure 2 displays the continuum - subtracted h@xmath0 2.12-@xmath4 image with the regions used to identify molecular hydrogen emission - line obje...	2.12-m / h 2.25- m flux ratios indicate another region dominated by fluorescence from a photo - dissociation region ( pdr ) , and one region that displays an anomalously low h 2.12-m / h 2.25- m flux ratio ( ) and coincides with a previously reported deeply embedded source ( des ) . continuum observations at 3 mm revea...	we have discovered 12 new molecular hydrogen emission - line objects ( mhos ) in the vicinity of the candidate massive young stellar object , in addition to five that were previously known . 2.12-m / h 2.25- m flux ratios indicate another region dominated by fluorescence from a photo - dissociation region ( pdr ) , and...
1211.3440	c	lorenzetti et al . ( 2002 ) found that [ ] 1.64-@xmath4/h@xmath0 2.12-@xmath4 flux ratios for knots associated with a jet from irs 8 in the vela molecular ridge ranged from @xmath7 0.1 - 1.1 ( uncorrected for extinction ) . since the [ ] and h@xmath0 emitting regions are unsurprisingly physically distinct , they comput...	the next brightest cores are both associated with cm continuum emission . the brighter of these bipolar mhos exhibits [ ] emission and both mhos are associated with choh maser emission observed at 95 ghz and 44 ghz . masses and column densities of all five cores are consistent with theoretical predictions for massive s...	we have discovered 12 new molecular hydrogen emission - line objects ( mhos ) in the vicinity of the candidate massive young stellar object , in addition to five that were previously known . 2.12-m / h 2.25- m flux ratios indicate another region dominated by fluorescence from a photo - dissociation region ( pdr ) , and...
astro-ph9512169	i	ionized gas is known to extend ( up to @xmath81 kpc ) out of the plane in normal spiral galaxies ( e.g. dettmar 1992 ) . the origin and maintenance of this component of the interstellar medium in normal galaxies is not completely understood , but most theories support the notion that it is energized by outflows from th...	we have launched a search for large - scale ( kpc ) minor - axis outflows in edge - on seyfert galaxies in order to assess their frequency of occurrence and study their properties . here we present optical continuum and 2 line images and/or minor - axis long - slit spectra of 22 edge - on seyfert galaxies .	we have launched a search for large - scale ( kpc ) minor - axis outflows in edge - on seyfert galaxies in order to assess their frequency of occurrence and study their properties . here we present optical continuum and 2 line images and/or minor - axis long - slit spectra of 22 edge - on seyfert galaxies . six of thes...
astro-ph9512169	r	descriptions of the observational data are given in table 4 . for each of the 22 objects observed , we list the type of data taken and the corresponding figure number for the images and/or spectra . we also list the total 2 luminosity from the galaxy for all objects for which we have 2 images , and the total 2 luminosi...	six of these galaxies show at least one of the following : ( i ) bi - symmetric h halos extending along the minor axis , ( ii ) bright emission - line complexes at distances kpc ( in projection ) out of the disk , and ( iii ) double - peaked emission - line profiles from the gas along the minor - axis , suggesting that...	we have launched a search for large - scale ( kpc ) minor - axis outflows in edge - on seyfert galaxies in order to assess their frequency of occurrence and study their properties . here we present optical continuum and 2 line images and/or minor - axis long - slit spectra of 22 edge - on seyfert galaxies . six of thes...
astro-ph9512169	c	the results from our observational data are listed symbolically in the last column of table 4 . for most of the objects we classified as good candidates for minor - axis outflows , either double - peaked emission lines are found from regions along the minor axis , or the morphology of the 2 emission resembles that of a...	our results indicate that of seyferts have good evidence for minor - axis galactic outflows . kinetic luminosities of the galactic outflows in our sample seyferts are erg s , assuming all of the observed minor - axis emission is produced by the outflow . these values are , in general ,.1 as large as those for well ...	we have launched a search for large - scale ( kpc ) minor - axis outflows in edge - on seyfert galaxies in order to assess their frequency of occurrence and study their properties . here we present optical continuum and 2 line images and/or minor - axis long - slit spectra of 22 edge - on seyfert galaxies . six of thes...
astro-ph0405260	c	we calculate the velocity components of fornax assuming that the distance to fornax is @xmath67 kpc , and the heliocentric radial velocity is @xmath68 km s@xmath2 ( mateo 1998 ) . we have adopted a standard solar motion of @xmath69 km s@xmath2 ( dehnen & binney 1998 ) with respect to the local standard of rest ( lsr ) ...	the corresponding orbit of fornax is polar , with an eccentricity of 0.27 , and a radial period of 4.5 gyr . fornax s current location is near pericenter . we propose that ram - pressure stripping due to the passage of fornax through a gaseous medium denser than the typical intragalactic medium left behind from the lmc...	we have measured the absolute proper motion of the fornax dwarf spheroidal galaxy from a combination of photographic plate material and wfpc2 data that provide a time baseline of up to 50 years . the extragalactic reference frame consists of 8 qso images and 48 galaxies . the absolute proper motion is mas yr and mas yr...
astro-ph0405260	i	we have measured the absolute proper motion of fornax dsph from a combination of photographic plates and @xmath0 wfpc2 images with a time baseline of up to 50 years . a total of 8 qso images and 48 galaxies were used in the correction to absolute proper motion . the uncertainty in each proper - motion direction is 0.16...	we have measured the absolute proper motion of the fornax dwarf spheroidal galaxy from a combination of photographic plate material and wfpc2 data that provide a time baseline of up to 50 years . the extragalactic reference frame consists of 8 qso images and 48 galaxies . the direction of the motion of fornax supports ...	we have measured the absolute proper motion of the fornax dwarf spheroidal galaxy from a combination of photographic plate material and wfpc2 data that provide a time baseline of up to 50 years . the extragalactic reference frame consists of 8 qso images and 48 galaxies . the absolute proper motion is mas yr and mas yr...
astro-ph0010058	c	we have presented new hubble space telescope observations of the quasar pair lbqs 0107@xmath0025a , b , along with observations of a third quasar , lbqs 0107@xmath00232 . @xcite found 5 coincident lyman @xmath1 lines in the quasar pair . the new data increase that yield to 12 coincident lines , albeit with a more gener...	this triple system is unique in providing sensitivity to coherent ly absorption on transverse scales of approximately 1 mpc at 1 . taking into account the equivalent widths of the lines , one of these triple coincidences is significant at the 99.99% confidence level , based on monte carlo simulations with random line p...	we have obtained follow - up observations of the quasar pair lbqs 0107a , b and new observations of the nearby quasar lbqs 0107 with the hubble space telescope faint object spectrograph . extended wavelength coverage of lbqs 0107a and b using the g270h grating was also obtained . this triple system is unique in providi...
0908.2103	i	the physics of low dimensional quantum magnets is a very interesting and topical area of research . these systems exhibit a broad range of novel physical properties and exotic quantum ground states , ranging from spin - peierls and haldane gap behavior in quasi - one - dimensional systems to high temperature supercondu...	we have performed detailed x - ray scattering measurements on single crystals of the spin - peierls compound tiobr in order to study the critical properties of the transition between the incommensurate spin - peierls state and the paramagnetic state at t 48 k. we have determined a value of the critical exponent which i...	we have performed detailed x - ray scattering measurements on single crystals of the spin - peierls compound tiobr in order to study the critical properties of the transition between the incommensurate spin - peierls state and the paramagnetic state at t 48 k. we have determined a value of the critical exponent which i...
astro-ph9811138	i	binaries have long been thought to have a crucial impact on globular cluster dynamics and evolution ( hut et al . 1992 ) , but only recently ( especially with the use of _ hst _ ) have large numbers of them been found in globular cluster cores where they are expected to act as the central energy source that drives clus...	( 1995 ) we present new evidence that cvs 13 may be dq her systems , as originally suggested by grindlay et al . ( 1995 ) , and we show that cv 4 may either be a dwarf nova or another magnetic system . we also present the first spectrum of a member of a new class of uv bright stars in ngc 6397 ( cool et al . 1998 ) . t...	we have used the hubble space telescope ( _ hst _ ) and the faint object spectrograph ( fos ) to study faint uv stars in the core of the nearby globular cluster ngc 6397 . we confirm the presence of a 4th cataclysmic variable ( cv ) in ngc 6397 ( hereafter cv 4 ) , and we use the photometry of cool et al . ( 1998 ) to ...
astro-ph9811138	c	we summarize here the results for cvs 14 : ( 1 ) a 4th cv candidate in ngc 6397 has been spectroscopically confirmed , ( 2 ) uv data for cv 1 implies that it has a red disk when compared with field cvs , ( 3 ) the photometry of cg98 combined with kurucz spectra for the estimated secondaries provide strong evidence that...	we confirm the presence of a 4th cataclysmic variable ( cv ) in ngc 6397 ( hereafter cv 4 ) , and we use the photometry of cool et al . ( 1998 ) to present evidence that cvs 14 all have faint disks and probably low accretion rates . by combining these results with new uv spectra of cv 1 and the published spectra of gri...	we have used the hubble space telescope ( _ hst _ ) and the faint object spectrograph ( fos ) to study faint uv stars in the core of the nearby globular cluster ngc 6397 . we confirm the presence of a 4th cataclysmic variable ( cv ) in ngc 6397 ( hereafter cv 4 ) , and we use the photometry of cool et al . ( 1998 ) to ...
1501.07466	c	within the context of @xmath6 theory , we have described a green s function method for handling radiative effects on false vacuum decay . by this means and employing the thin- and planar - wall approximations , we have been able to calculate analytically and in a straightforward manner both the functional determinant o...	we introduce a green s function method for handling radiative effects on false vacuum decay . , we take the theory , extended with additional heavier scalars , wherein we calculate analytically both the functional determinant of the quadratic fluctuations about the classical soliton configuration and the first correcti...	we introduce a green s function method for handling radiative effects on false vacuum decay . in addition to the usual thin - wall approximation , we achieve further simplification by treating the bubble wall in the planar limit . as an application , we take the theory , extended with additional heavier scalars , where...
1504.05296	i	a tiling of the plane is a covering of @xmath2 by a collection of compact subsets , called _ tiles _ , for which two distinct tiles can only meet along their boundaries . the building blocks of a tiling are the _ prototiles _ : a finite set of tiles with the property that every other tile is a translation of some proto...	we introduce a new class of noncommutative spectral triples on kellendonk s-algebra associated with a nonperiodic substitution tiling . these spectral triples are constructed from fractal trees on tilings , which define a geodesic distance between any two tiles in the tiling . we show that each spectral triple is-summa...	we introduce a new class of noncommutative spectral triples on kellendonk s-algebra associated with a nonperiodic substitution tiling . these spectral triples are constructed from fractal trees on tilings , which define a geodesic distance between any two tiles in the tiling . since fractals typically have infinite euc...
1410.0007	i	most of our knowledge of the stellar populations of galaxies comes from fitting stellar population synthesis models to their integrated light , as it is prohibitively difficult to characterize individual stars outside of the local volume . these models are commonly used to measure the total stellar masses of galaxies ,...	differential spectroscopy of pixels as a function of fluctuation strength ( `` fluctuation spectroscopy '' ) effectively measures the spectral variation of stars as a function of their luminosity , information that is otherwise difficult to obtain for individual stars outside of the local group . models with ages or me...	we introduce a new method to determine the relative contributions of different types of stars to the integrated light of nearby early - type galaxies . as is well known , the surface brightness of these galaxies shows pixel - to - pixel fluctuations due to poisson variations in the number of giant stars . differential ...
1009.3173	i	during the evolution of a cancer disease , a fundamental step for the tumor consists in provoking proliferation of the surrounding blood vessels and migration toward the tumour . this process , called tumoral neo - angiogenesis establishes a proper vascular network which ensures to the tumour supply of nutrients and al...	it is a structured transport equation with a nonlocal boundary condition describing the evolution of the density of metastasis that we analyze first at the continuous level . we present the numerical analysis of a lagrangian scheme based on the characteristics whose convergence establishes existence of solutions + nous...	we introduce and analyze a phenomenological model for anti - angiogenic therapy in the treatment of metastatic cancers . it is a structured transport equation with a nonlocal boundary condition describing the evolution of the density of metastasis that we analyze first at the continuous level . we present the numerical...
1003.5926	i	financial bubbles are generally defined as transient upward acceleration of prices above fundamental value @xcite . however , identifying unambiguously the presence of a bubble remains an unsolved problem in standard econometric and financial economic approaches @xcite , due to the fact that the fundamental value is in...	we introduce the concept of `` negative bubbles '' as the mirror ( but not necessarily exactly symmetric ) image of standard financial bubbles , in which positive feedback mechanisms may lead to transient accelerating price falls . to model these negative bubbles , we adapt the johansen - ledoit - sornette ( jls ) mode...	we introduce the concept of `` negative bubbles '' as the mirror ( but not necessarily exactly symmetric ) image of standard financial bubbles , in which positive feedback mechanisms may lead to transient accelerating price falls . to model these negative bubbles , we adapt the johansen - ledoit - sornette ( jls ) mode...
0706.3737	i	recent experiments @xcite have unravelled a fascinating set of phenomena in atomically thin layer of hexagonally arranged carbon atoms known as graphene . @xcite the quasiparticles of graphene are @xmath0-dimensional massless weyl fermions . @xcite in the context of condensed matter physics their properties are strikin...	we investigate , analytically and numerically , the effects of disorder on the density of states and on the localization properties of the relativistic two dimensional fermions in the lowest landau level . employing a supersymmetric technique we use a numerical technique to establish the localization - delocalization (...	we investigate , analytically and numerically , the effects of disorder on the density of states and on the localization properties of the relativistic two dimensional fermions in the lowest landau level . employing a supersymmetric technique , we calculate the exact density of states for the cauchy ( lorentzian ) dist...
1601.00549	i	boosting is considered as one of the most important ensemble learning methods in the machine learning literature and it is extensively used in several different real life applications from classification to regression ( @xcite ) . as an ensemble learning method ( @xcite ) , boosting combines several parallel running ``...	in addition , we implement several variants of the proposed generic algorithm . we demonstrate an intrinsic relationship , in terms of boosting , between the adaptive mixture - of - experts and data reuse algorithms . furthermore , we provide theoretical bounds for the computational complexity of our proposed algorithm...	we investigate boosted online regression and propose a novel family of regression algorithms with strong theoretical bounds . in addition , we implement several variants of the proposed generic algorithm . we specifically provide theoretical bounds for the performance of our proposed algorithms that hold in a strong ma...
1601.00549	c	we introduced a novel family of boosted online regression algorithms and proposed three different boosting approaches , i.e. , weighted updates , data reuse , and random updates , which can be applied to different online learning algorithms . we provide theoretical bounds for the mse performance of our proposed methods...	we specifically provide theoretical bounds for the performance of our proposed algorithms that hold in a strong mathematical sense . furthermore , we introduce a boosting algorithm based on random updates that is significantly faster than the conventional boosting methods and other variants of our proposed algorithms w...	we investigate boosted online regression and propose a novel family of regression algorithms with strong theoretical bounds . in addition , we implement several variants of the proposed generic algorithm . we specifically provide theoretical bounds for the performance of our proposed algorithms that hold in a strong ma...
1004.1417	i	constructing models of inflation in string theory is an active field , for reviews see e.g. @xcite . because string theory naturally has many dynamical degrees of freedom , multi - field models of inflation are also common . examples are inflation from axions @xcite , tachyons @xcite , m5-branes @xcite or multiple d -...	the stack closest to the bottom of the throat annihilates first with antibranes , resulting in particle production and a change of the equation of state parameter . we find an oscillatory modulation of the power - spectrum for scales within the horizon at the time of the collision , and a slightly redder spectrum on su...	we investigate brane inflation driven by two stacks of mobile branes in a throat . the stack closest to the bottom of the throat annihilates first with antibranes , resulting in particle production and a change of the equation of state parameter . we calculate analytically some observable signatures of the collision ; ...