Large-scale structure and the Cardassian fluid

Details Large-scale structure and the Cardassian fluid Large-scale structure and the Cardassian fluid

2006-08-29

arxiv.org/abs/gr-qc/0608126v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages, 18 figures, Accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20064965

In this paper, we confront the predictions of the power law cardassian model for the baryon power spectrum with the observations of the SDSS galaxy survey. We show that they fit only for very unusual values of the cold dark matter or baryon density parameters, the Hubble parameter or the spectral index of the initial power spectrum. Moreover, the best-fit Cardassian models turn out to be phantom models. If one wants to recover the usual values for these constants, as quoted by the WMAP team, the power law Cardassian model turns out to be indistinguishable from a LCDM model.

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