Large-Scale Structure Formation with Massive Neutrinos and Dynamical Dark Energy
Abstract
Over the next decade, cosmological measurements of the large-scale structure of the Universe will be sensitive to the combined effects of dynamical dark energy and massive neutrinos. The matter power spectrum is a key repository of this information. We extend higher-order perturbative methods for computing the power spectrum to investigate these effects over quasi-linear scales. Through comparison with N-body simulations we establish the regime of validity of a Time-Renormalization Group (Time-RG) perturbative treatment that includes dynamical dark energy and massive neutrinos. We also quantify the accuracy of Standard (SPT), Renormalized (RPT) and Lagrangian Resummation (LPT) perturbation theories without massive neutrinos. We find that an approximation that neglects neutrino clustering as a source for nonlinear matter clustering predicts the Baryon Acoustic Oscillation (BAO) peak position to 0.25% accuracy for redshifts 1 < z < 3, justifying the use of LPT for BAO reconstruction in upcoming surveys. We release a modified version of the public Copter code which includes the additional physics discussed in the paper.
Cite
@article{arxiv.1309.5872,
title = {Large-Scale Structure Formation with Massive Neutrinos and Dynamical Dark Energy},
author = {Amol Upadhye and Rahul Biswas and Adrian Pope and Katrin Heitmann and Salman Habib and Hal Finkel and Nicholas Frontiere},
journal= {arXiv preprint arXiv:1309.5872},
year = {2014}
}
Comments
Code available at http://www.hep.anl.gov/cosmology/pert.html . 16 pages, 10 figures. Matches version accepted by PRD