Extending the scope of models for large-scale structure formation in the Universe

Details Extending the scope of models for large-scale structure formation in the Universe Extending the scope of models for large-scale structure formation in the Universe

1997-09-23

arxiv.org/abs/astro-ph/9709218v2

Astron.Astrophys.349:343-353,1999

Astronomy and Astrophysics

Astrophysics

matches published version in A&A, incl. 3 figures

Scientific paper

We propose a phenomenological generalization of the models of large-scale structure formation in the Universe by gravitational instability in two ways: we include pressure forces to model multi-streaming, and noise to model fluctuations due to neglected short-scale physical processes. We show that pressure gives rise to a viscous-like force of the same character as that one introduced in the ``adhesion model'', while noise leads to a roughening of the density field yielding a scaling behavior of its correlations.

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