We present the first attempt to analytically study the nonlinear matter power spectrum for a mixed dark matter model containing neutrinos of total mass ~0.1eV, based on cosmological perturbation theory. The suppression in the power spectrum amplitudes due to massive neutrinos is enhanced in the weakly nonlinear regime. We demonstrate that, thanks to this enhanced effect, the use of such a nonlinear model may enable a precision of σ(mÎ½,tot) ~ 0. 07eV in constraining the total neutrino mass for the planned galaxy redshift survey, a factor of 2 improvement compared to the linear regime.
S. Saito et al., "Impact of Massive Neutrinos on the Nonlinear Matter Power Spectrum," Physical Review Letters, vol. 100, no. 19, American Physical Society (APS), May 2008.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.100.191301
Keywords and Phrases
Constrained optimization; Linear systems; Mathematical models; Nonlinear equations; Power spectrum, Massive neutrinos; Nonlinear models; Redshift survey, Particle beams
International Standard Serial Number (ISSN)
Article - Journal
© 2008 American Physical Society (APS), All rights reserved.
01 May 2008