%T Nonlinear matter spectra in coupled quintessence
%R 10.1103/PhysRevD.82.023528
%P 023528
%J Physical Review D
%V 82
%D 2010
%A Fabio Saracco
%A M. Pietroni
%A N. Tetradis
%A V. Pettorino
%A G. Robbers
%I American Physical Society
%L eprints2905
%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.