Spherical `Top-Hat' Collapse in general Chaplygin gas dominated universes

Details Spherical `Top-Hat' Collapse in general Chaplygin gas dominated universes Spherical `Top-Hat' Collapse in general Chaplygin gas dominated universes

2011-10-27

arxiv.org/abs/1110.6205v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

17 pages, 5 figures, submitted to Phys. Rev. D. Changes: A new table (Table II) and a new paragraph (at the end of section III

Scientific paper

We expand previous works on the spherical `top-hat' collapse (SC-TH) framework in generalized Chaplygin gas (gCg) dominated universes. Here we allow the collapse in all energetic components within the system. We analyze the non-linear stages of collapse for various choices of parameter \alpha of the gCg model introducing an exact formulation for the so-called effective sound speed, $c_{eff}^2$. We show that, within the SC-TH framework, the growth of the structure becomes faster with increasing values of \alpha.

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