Large-scale inhomogeneities in modified Chaplygin gas cosmologies

Details Large-scale inhomogeneities in modified Chaplygin gas cosmologies Large-scale inhomogeneities in modified Chaplygin gas cosmologies

2004-11-02

arxiv.org/abs/astro-ph/0411068v2

Phys.Lett. B615 (2005) 146-152

Astronomy and Astrophysics

Astrophysics

6 pages, revtex, twocolumn, added justification for the model and modified conclusions

Scientific paper

10.1016/j.physletb.2005.04.029

We extend the homogeneous modified Chaplygin cosmologies to large-scale perturbations by formulating a Zeldovich-like approximation. We show that the model interpolates between an epoch with a soft equation of state and a de Sitter phase, and that in the intermediate regime its matter content is simply the sum of dust and a cosmological constant. We then study how the large-scale inhomogeneities evolve and compare the results with cold dark matter (CDM), $\Lambda$CDM and generalized Chaplygin scenarios. Interestingly, we find that unlike the latter, our models do always resemble $\Lambda$CDM.

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