Constraints on neutrino masses from WMAP5 and BBN in the lepton asymmetric universe

Details Constraints on neutrino masses from WMAP5 and BBN in the lepton asymmetric universe Constraints on neutrino masses from WMAP5 and BBN in the lepton asymmetric universe

2009-04-28

arxiv.org/abs/0904.4396v2

JCAP 0907:005,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

19 pages, 7 figures, 5 tables

Scientific paper

10.1088/1475-7516/2009/07/005

In this paper, we put constraints on neutrino properties such as mass $m_{\nu}$ and degeneracy parameters $\xi_i$ from WMAP5 data and light element abundances by using a Markov chain Monte Carlo (MCMC) approach. In order to take consistently into account the effects of the degeneracy parameters, we run the Big Bang Nucleosynthesis code for each value of $\xi_i$ and the other cosmological parameters to estimate the Helium abundance, which is then used to calculate CMB anisotropy spectra instead of treating it as a free parameter. We find that the constraint on $m_{\nu}$ is fairly robust and does not vary very much even if the lepton asymmetry is allowed, and is given by $\sum m_\nu < 1.3 \rm eV$ ($95 % \rm C.L.$).

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