Non-linear damping of superimposed primordial oscillations on the matter power spectrum in galaxy surveys
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Date
2020
Journal Title
Journal ISSN
Volume Title
Publisher
IOP Publishing Ltd
Abstract
Galaxy surveys are an important probe for superimposed oscillations on the primordial power spectrum of curvature perturbations, which are predicted in several theoretical
models of inflation and its alternatives. In order to exploit the full cosmological information
in galaxy surveys it is necessary to study the matter power spectrum to fully non-linear
scales. We therefore study the non-linear clustering in models with superimposed linear and
logarithmic 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
superimposed 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
this fitting formula to forecast the capabilities of future galaxy surveys, such as Euclid and
Subaru, to probe primordial oscillation down to non-linear scales alone and in combination
with the information contained in CMB anisotropies.
Description
Keywords
Cosmological parameters from LSS, Galaxy clusters, Physics of the early universe, Power spectrum, Galaxy surveys
Citation
Ballardini, M. et al. (2020). Non-linear damping of superimposed primordial oscillations on the matter power spectrum in galaxy surveys. Journal of Cosmology and Astroparticle Physics, 2020(04)