Non-linear damping of superimposed primordial oscillations on the matter power spectrum in galaxy surveys
Mario Ballardini, Riccardo Murgia, Marco Baldi, Fabio Finelli, Matteo Viel
Abstract
Galaxy surveys are an important probe for superimposed oscillations on the primordial power spectrum of curvature perturbations, which are predicted in several theoretical \nmodels of inflation and its alternatives. In order to exploit the full cosmological information \nin galaxy surveys it is necessary to study the matter power spectrum to fully non-linear \nscales. We therefore study the non-linear clustering in models with superimposed linear and \nlogarithmic oscillations to the primordial power spectrum by running high-resolution darkmatter-only N-body simulations. We fit a Gaussian envelope for the non-linear damping of \nsuperimposed oscillations in the matter power spectrum to the results of the N-body simulations for k . 0.6 h/Mpc at 0 ≤ z ≤ 5 with an accuracy below the percent. We finally use \nthis fitting formula to forecast the capabilities of future galaxy surveys, such as Euclid and \nSubaru, to probe primordial oscillation down to non-linear scales alone and in combination \nwith the information contained in CMB anisotropies.