Non-linear damping of superimposed primordial oscillations on the matter power spectrum in galaxy surveys

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 dark-matter-only N-body simulations. We then derive a fitting formula for the non-linear redshift-dependent damping of primordial superimposed oscillations in the matter power spectrum 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.

Dark acoustic oscillations: imprints on the matter power spectrum and the halo mass function

“…interactions in the dark matter sector, forming pressure-gravity waves that are imprinted on the clustering signal. Dark acoustic oscillations have been predicted for scenarios of DM-photon (Boehm et al 2002) and DM-neutrino interactions (Mangano et al 2006;Wilkinson et al 2014), models including dark radiation (Ackerman et al 2009;Foot & Vagnozzi 2015Dessert et al 2019; ★ E-mail: timothee.schaeffer@uzh.ch † E-mail: aurel.schneider@uzh.ch Das et al 2019), dark atom scenarios (Cyr-Racine & Sigurdson 2013), or through alternative scenarios of inflation (Domènech & Kamionkowski 2019;Ballardini et al 2020).…”

Planck residuals anomaly as a fingerprint of alternative scenarios to inflation

“…Future galaxy surveys, together with future CMB experiments, will be able to place new constraints on oscillatory features in the primordial power spectrum [44][45][46][47][48][49][50][51]90]. It has also been found that such oscillatory features are quite robust to non-linear evolution of matter and could be seen in the BAO [51].…”

“…As we can see, both the inflation and non-inflation candidates mentioned above so far all only have marginal statistical significance, and the Planck power spectrum residuals are still consistent with statistical fluctuations. However, with future CMB polarization experiments and large scale structure surveys [44][45][46][47][48][49][50][51]90], these candidates can be further tested, and can be falsified or distinguished from each other.…”

Dark acoustic oscillations: Imprints on the matter power spectrum and the halo mass function

“…interactions in the dark matter sector, forming pressure-gravity waves that are imprinted on the clustering signal. Dark acoustic oscillations have been predicted for scenarios of DM-photon (Boehm et al 2002) and DM-neutrino interactions (Mangano et al 2006;Wilkinson et al 2014), models including dark radiation (Ackerman et al 2009;Dessert et al 2019), more complex dark atom scenarios ★ E-mail: timothee.schaeffer@uzh.ch † E-mail: aurel.schneider@uzh.ch (Cyr-Racine & Sigurdson 2013;Dessert et al 2019), or through alternative scenarios of inflation (Domènech & Kamionkowski 2019;Ballardini et al 2020).…”