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 multicomponent 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% level in the range of scales of baryonic acoustic oscillations. We compare our results with N-body simulations, finding very good agreement. © 2010 The American Physical Society.
|Titolo:||Nonlinear matter spectra in coupled quintessence|
|Data di pubblicazione:||2010|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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