Constraint on the effective number of neutrino species from the WMAP and SDSS LRG power spectra

Kazuhide Ichikawa, Masahiro Kawasaki, Fuminobu Takahashi

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number007
JournalJournal of Cosmology and Astroparticle Physics
Issue number5
DOIs
Publication statusPublished - 2007 May 1
Externally publishedYes

Keywords

  • CMBR theory
  • Cosmological neutrinos
  • Cosmology of theories beyond the SM
  • Power spectrum

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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