Toward an accurate Dark Matter power spectrum beyond BAO scales

2012/10/28 by Naonori S. Sugiyama, Toshifumi Futamase, Sugiyama, Naonori S. +1
Physics and Astronomy · #Atomic and Subatomic Physics Research #Dark Matter and Cosmic Phenomena #Particle Detector Development and Performance #astro-ph.CO #gr-qc

paper · pdf · doi:10.48550/arxiv.1210.7499

4 pages, 1 figure

arxiv created 2012/11/30 · arxiv updated 2012/12/03

Abstract

We propose a new approximated expression for non-linear Dark Matter power spectrum much beyond BAO scales. The proposed expression agrees with the result of N-body simulation with the accuracy better than 2 % up to k=1.0 [h/Mpc] and k=0.7 [h/Mpc] at z=3.0 and z=1.0, respectively. Even at z=0.35, the accuracy remains within 10 % up to k=0.8 [h/Mpc]. In doing so, we used an approximation for the kernel functions used in the Standard Perturbation Theory (SPT) which is also used to prove the Reg PT proposed by Bernardeau et al. (2011).

Related

• An analytic approximation of MDM power spectra in four dimensional parameter space
• Dark energy and non-linear power spectrum
• Matter Power Spectra in Modified Gravity: A Comparative Study of Approximations and N-Body Simulations
• What the "simple renormalization group" approach to dark matter clustering really was
• Probing the Small Scale Matter Power Spectrum through Dark Matter Annihilation in the Early Universe