Non-linear gravitational clustering of cold matter in an expanding universe: indications from 1D toy models

Details Non-linear gravitational clustering of cold matter in an expanding universe: indications from 1D toy models Non-linear gravitational clustering of cold matter in an expanding universe: indications from 1D toy models

2010-12-07

arxiv.org/abs/1012.1515v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

9 pages, 4 figures (one in color), additional references and short discussion on collisionality, version to appear in MNRAS

Scientific paper

Studies of a class of infinite one dimensional self-gravitating systems have highlighted that, on the one hand, the spatial clustering which develops may have scale invariant (fractal) properties, and, on the other, that they display "self-similar" properties in their temporal evolution. The relevance of these results to three dimensional cosmological simulations has remained unclear. We show here that the measured exponents characterizing the scale-invariant non-linear clustering are in excellent agreement with those derived from an appropriately generalized "stable-clustering" hypothesis. Further an analysis in terms of "halos" selected with a friend-of-friend algorithm reveals that such structures are, statistically, virialized across the range of scales corresponding to scale-invariance. Thus the strongly non-linear clustering in these models is accurately described as a virialized fractal structure, very much in line with the "clustering hierarchy" which Peebles originally envisaged qualitatively as associated with stable clustering. If transposed to three dimensions these results would imply, notably, that cold dark matter halos (or even subhalos) are 1) not well modeled as smooth objects, and 2) that the supposed "universality" of their profiles is, like apparent smoothness, an artefact of poor numerical resolution.

Affiliated with

Also associated with

No associations

Rating

Non-linear gravitational clustering of cold matter in an expanding universe: indications from 1D toy models does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Non-linear gravitational clustering of cold matter in an expanding universe: indications from 1D toy models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-linear gravitational clustering of cold matter in an expanding universe: indications from 1D toy models will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-480971