  A semi-analytic approach to the computation of the non-linear power-spectrum
of dark matter density fluctuations is proposed. The method is based on the
Renormalization Group technique and can be applied to any underlying
cosmological model. Our prediction on the baryonic acoustic oscillations in a
LambdaCDM model accurately fits the results of N-body simulations down to zero
redshift, where perturbation theory fails.
