Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2015/07/001
Keywords
baryon acoustic oscillations; neutrino masses from cosmology; cosmological perturbation theory
Funding
- DOE grant at the University of Minnesota [de-sc0011842]
- European Union FP7 ITN INVISIBLES (Marie Curie Actions) [PITN- GA-2011- 289442]
- research grant Theoretical Astroparticle Physics under the program program PRIN - Ministero dell'Istruzione, Universita e della Ricerca (MIUR) [2012CPPYP7]
- ERC StG cosmoIGM grant
- INFN IS PD51 INDARK grant
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We study the impact of neutrino masses on the shape and height of the BAO peak of the matter correlation function, both in real and redshift space. In order to describe the nonlinear evolution of the BAO peak we run N-body simulations and compare them with simple analytic formulae. We show that the evolution with redshift of the correlation function and its dependence on the neutrino masses is well reproduced in a simplified version of the Zel'dovich approximation, in which the mode-coupling contribution to the power spectrum is neglected. While in linear theory the BAO peak decreases for increasing neutrino masses, the effect of nonlinear structure formation goes in the opposite direction, since the peak broadening by large scale flows is less effective. As a result of this combined effect, the peak decreases by similar to 0.6 % for Sigma m(v) = 0: 15 eV and increases by similar to 1.2% for Sigma m(v) = 0: 3 eV, with respect to a massless neutrino cosmology with equal value of the other cosmological parameters. We extend our analysis to redshift space and to halos, and confirm the agreement between simulations and the analytic formulae. We argue that all analytical approaches having the Zel'dovich propagator in their lowest order approximation should give comparable performances, irrespectively to their formulation in Lagrangian or in Eulerian space.
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