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

Abstract

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.

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

References in corpus (11)

• Cosmological Constraints from the SDSS Luminous Red Galaxies
• Cosmological parameters from combining the Lyman-alpha forest with CMB, galaxy clustering and SN constraints
• Moduli Decays and Gravitinos
• The Gravitino-Overproduction Problem in Inflationary Universe
• Moduli/Inflaton Mixing with Supersymmetry Breaking Field
• Inflaton Decay through Supergravity Effects
• Primordial Helium Abundance: A Reanalysis of the Izotov-Thuan Spectroscopic Sample
• Neutrino masses and cosmic radiation density: Combined analysis
• Limit on the Neutrino Mass from the WMAP Three Year Data
• Cosmology of neutrinos and extra light particles after WMAP3
• Non-thermal Production of Dark Matter from Late-Decaying Scalar Field at Intermediate Scale

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