TY - JOUR
T1 - Constraint on the effective number of neutrino species from the WMAP and SDSS LRG power spectra
AU - Ichikawa, Kazuhide
AU - Kawasaki, Masahiro
AU - Takahashi, Fuminobu
PY - 2007/5/1
Y1 - 2007/5/1
N2 - We derive a constraint on the effective number of neutrino species N ν 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<Nν<8.2 (95% C.L.) for the power-law Λ CDM flat universe, with no external prior. The lower limit corresponds to the lower bound on the reheating temperature of the universe TR>2MeV.
AB - We derive a constraint on the effective number of neutrino species N ν 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<Nν<8.2 (95% C.L.) for the power-law Λ CDM flat universe, with no external prior. The lower limit corresponds to the lower bound on the reheating temperature of the universe TR>2MeV.
KW - CMBR theory
KW - Cosmological neutrinos
KW - Cosmology of theories beyond the SM
KW - Power spectrum
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U2 - 10.1088/1475-7516/2007/05/007
DO - 10.1088/1475-7516/2007/05/007
M3 - Article
AN - SCOPUS:34547569162
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
SN - 1475-7516
IS - 5
M1 - 007
ER -