2011/10/31 by R. A. A. Fernandes, J. P. M. de Carvalho, A. Yu. Kamenshchik +2 · 1 citation
Physics and Astronomy · #astro-ph.CO
paper · pdf · doi:10.1103/physrevd.85.083501
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.B), were added; Fig. 5 was redrawn and split in two sub-plots, 5a and 5b. We have added a few comments, and a reference, in the introduction; Slight text modifications and typos correction
arxiv created 2012/02/08 · arxiv updated 2013/05/29
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 αof the gCg model introducing an exact formulation for the so-called effective sound speed, ceff2. We show that, within the SC-TH framework, the growth of the structure becomes faster with increasing values of α.