Non-linear Matter Spectra in Coupled Quintessence

Details Non-linear Matter Spectra in Coupled Quintessence Non-linear Matter Spectra in Coupled Quintessence

2009-11-28

arxiv.org/abs/0911.5396v3

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

20 pages, 6 figures, final version to apper in Physical Review D

Scientific paper

We consider cosmologies in which a dark-energy scalar field interacts with cold dark matter. The growth of perturbations is followed beyond the linear level by means of the time-renormalization-group method, which is extended to describe a multi-component matter sector. Even in the absence of the extra interaction, a scale-dependent bias is generated as a consequence of the different initial conditions for baryons and dark matter after decoupling. The effect is enhanced significantly by the extra coupling and can be at the 2-3 percent level in the range of scales of baryonic acoustic oscillations. We compare our results with N-body simulations, finding very good agreement.

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