%0 Journal Article
%@ 1550-7998
%A Saracco, Fabio
%A Pietroni, M.
%A Tetradis, N.
%A Pettorino, V.
%A Robbers, G.
%D 2010
%F eprints:2905
%I American Physical Society
%J Physical Review D
%P 023528
%T Nonlinear matter spectra in coupled quintessence
%U http://eprints.imtlucca.it/2905/
%V 82
%X 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.