Constraint on the Effective Number of Neutrino Species from the WMAP and SDSS LRG Power Spectra

Details Constraint on the Effective Number of Neutrino Species from the WMAP and SDSS LRG Power Spectra Constraint on the Effective Number of Neutrino Species from the WMAP and SDSS LRG Power Spectra

2006-11-26

arxiv.org/abs/astro-ph/0611784v2

JCAP 0705:007,2007

Astronomy and Astrophysics

Astrophysics

16 pages, 3 figure. (v2) More explanation and discussion on our analysis. A section and figures are added

Scientific paper

10.1088/1475-7516/2007/05/007

We derive constraint on the effective number of neutrino species N_nu from the cosmic microwave background power spectrum of the WMAP and galaxy clustering power spectrum of the SDSS luminous red galaxies (LRGs). Using these two latest data sets of CMB and galaxy clustering alone, we obtain the limit 0.9 < N_nu < 8.2 (95% C.L.) for the power-law LambdaCDM flat universe, with no external prior. The lower limit corresponds to the lower bound on the reheating temperature of the universe T_R > 2 MeV.

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