A new model for the full shape of the large-scale power spectrum

作者：Montesano Francesco^*; Sanchez Ariel G; Phleps Stefanie

来源：Monthly Notices of the Royal Astronomical Society, 2010, 408(4): 2397-2412.

DOI：10.1111/j.1365-2966.2010.17292.x

• cosmology: theory
• large-scale structure of Universe

We present a new model for the full shape of the large-scale power spectrum based on renormalized perturbation theory. To test the validity of this prescription, we compare this model to power spectra measured in a suite of 50 large-volume, moderate-resolution N-body simulations. Our results indicate that this simple model provides an accurate description of the full shape of the power spectrum taking into account the effects of non-linear evolution, redshift-space distortions and halo bias for scales k less than or similar to 0.15 h Mpc(-1), making it a valuable tool for the analysis of forthcoming galaxy surveys. Even though its application is restricted to large scales, this prescription can provide tighter constraints on the dark energy equation of state parameter w(DE) than those obtained by modelling the baryonic acoustic oscillations signal only, where the information of the broad-band shape of the power spectrum is discarded. Our model is able to provide constraints comparable to those obtained by applying a similar model to the full shape of the correlation function, which is affected by different systematics. Hence, with accurate modelling of the power spectrum, the same cosmological information can be extracted from both statistics.

• 出版日期2010-11-11