Zobrazeno 1 - 10
of 32
pro vyhledávání: '"Shandarin, S. F."'
Publikováno v:
Mon.Not.Roy.Astron.Soc.353:162,2004
We report here the first systematic study of the supercluster-void network in the LCDM concordance cosmology in which voids and superclusters are treated on an equal footing. Superclusters are defined as individual members of an over-dense excursion
Externí odkaz:
http://arxiv.org/abs/astro-ph/0312110
Publikováno v:
Astrophys.J. 476 (1997) L1-L5
We study topological properties of large scale structure in a set of scale free N-body simulations using the genus and percolation curves as topological characteristics. Our results show that as gravitational clustering advances, the density field sh
Externí odkaz:
http://arxiv.org/abs/astro-ph/9612029
Two-body scattering and other discreteness effects are unimportant in cosmological gravitational clustering in most scenarios, since the dark matter has a small particle mass. The collective field should determine evolution: Two-body scattering in si
Externí odkaz:
http://arxiv.org/abs/astro-ph/9609152
We present results of tests of the evolution of small ``fluid elements'' in cosmological N--body simulations, to examine the validity of their treatment as particles. We find that even very small elements typically collapse along one axis while expan
Externí odkaz:
http://arxiv.org/abs/astro-ph/9607152
Publikováno v:
Astrophys.J. 462 (1996) L5-L8
The morphological nature of structures that form under gravitational instability has been of central interest to cosmology for over two decades. A remarkable feature of large scale structures in the Universe is that they occupy a relatively small fra
Externí odkaz:
http://arxiv.org/abs/astro-ph/9603085
Autor:
Sahni, V., Shandarin, S. F.
Publikováno v:
Mon.Not.Roy.Astron.Soc.282:641,1996
We study the behaviour of spherical Voids in Lagrangian perturbation theories L(n), of which the Zel'dovich approximation is the lowest order solution L(1). We find that at early times higher order L(n) give an increasingly accurate picture of Void e
Externí odkaz:
http://arxiv.org/abs/astro-ph/9510142
Publikováno v:
Phys.Rev.Lett. 75 (1995) 7-10
Since the early seventies, there was a conjecture that the first collapse of a selfgravitating dust--like medium (appropriate approximation for nonbaryonic dark matter) results in the formation of a ``pancake" object, that is a thin surface. The conj
Externí odkaz:
http://arxiv.org/abs/astro-ph/9407050
Publikováno v:
Mon.Not.Roy.Astron.Soc.269:626,1994
We have recently learned that the Zeldovich approximation can be successfully used for a far wider range of gravitational instability scenarios than formerly proposed; we study here how to extend this range. In previous work we studied the accuracy o
Externí odkaz:
http://arxiv.org/abs/astro-ph/9312044
We present in this paper a quantitative method for defining void size in large-scale structure based on percolation threshold density. Beginning with two-dimensional gravitational clustering simulations smoothed to the threshold of nonlinearity, we p
Externí odkaz:
http://arxiv.org/abs/astro-ph/9311076
We quantitatively compare a particle implementation of the adhesion approximation to fully non--linear, numerical nbody simulations. Our primary tool, cross--correlation of nbody simulations with the adhesion approximation, indicates good agreement,
Externí odkaz:
http://arxiv.org/abs/astro-ph/9311075