Emergence of filamentary structure in cosmological gravitational clustering

Sathyaprakash, Bangalore Suryanarayana ORCID: https://orcid.org/0000-0003-3845-7586, Sahni, Varun and Shandarin, Sergei F. 1996. Emergence of filamentary structure in cosmological gravitational clustering. Astrophysical Journal 462 (1) , L5-L8. 10.1086/310024

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Abstract

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 fraction of the volume and yet show coherence on scales comparable to the survey size. With the aid of a useful synthesis of percolation analysis and shape statistics we explore the evolution of morphology of isolated density clumps in real space, and that of the cluster distribution as a whole, in scale-invariant cosmological models of gravitational instability. Our results, based on an exhaustive statistical analysis, indicate that at finite density thresholds one-dimensional filaments are more abundant than two-dimensional sheets (pancakes) at most epochs and for all spectra, although the first singularities could be pancake-like. Both filamentarity and pancakeness of structures grow with time (in scale-free models this is equivalent to an increase in resolution), leading to the development of a long coherence length scale in simulations.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	cosmology:theory ; large-scale structure of universe
Publisher:	IOP Publishing
ISSN:	0004-637X
Last Modified:	24 Oct 2022 10:50
URI:	https://orca.cardiff.ac.uk/id/eprint/46074

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