期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 5, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2007/05/007
关键词
CMBR theory; cosmological neutrinos; cosmology of theories beyond the SM; power spectrum
We derive a 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 Lambda CDM. at 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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