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

Abstract

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 $\sum m_{\nu }<1.3\mathrm{eV}$ ($95$).

arXiv comment19 pages, 7 figures, 5 tables

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