Massive Neutrinos and the Non-linear Matter Power Spectrum

Details Massive Neutrinos and the Non-linear Matter Power Spectrum Massive Neutrinos and the Non-linear Matter Power Spectrum

2011-09-20

arxiv.org/abs/1109.4416v2

MNRAS, March 2012, Vol 420, Issue 3, 2551-2561

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

12 pages, 6 figures, version accepted by MNRAS. v2: Minor clarifications and corrections, citations added. Code available in C

Scientific paper

10.1111/j.1365-2966.2011.20222.x

We perform an extensive suite of N-body simulations of the matter power spectrum, incorporating massive neutrinos in the range M = 0.15-0.6 eV, probing the non-linear regime at scales k < 10 hMpc-1 at z < 3. We extend the widely used HALOFIT approximation to account for the effect of massive neutrinos on the power spectrum. In the strongly non-linear regime HALOFIT systematically over-predicts the suppression due to the free-streaming of the neutrinos. The maximal discrepancy occurs at k ~ 1 hMpc-1, and is at the level of 10% of the total suppression. Most published constraints on neutrino masses based on HALOFIT are not affected, as they rely on data probing the matter power spectrum in the linear or mildly non-linear regime. However, predictions for future galaxy, Lyman-alpha forest and weak lensing surveys extending to more non-linear scales will benefit from the improved approximation to the non-linear matter power spectrum we provide. Our approximation reproduces the induced neutrino suppression over the targeted scales and redshifts significantly better. We test its robustness with regard to changing cosmological parameters and a variety of modelling effects.

Affiliated with

Also associated with

No associations

Rating

Massive Neutrinos and the Non-linear Matter Power Spectrum does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Massive Neutrinos and the Non-linear Matter Power Spectrum, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Massive Neutrinos and the Non-linear Matter Power Spectrum will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-255828