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Probing for variation of neutrino mass with current observations

Gong-Bo Zhao·Jun-Qing Xia·Xinmin Zhang
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Abstract

With the latest astronomical data including Cosmic Microwave Background (WMAP three year, CBI, ACBAR, VSA), Type Ia Supernova ("gold sample"), Galaxy Clustering (SDSS 3-D matter power, Lyman-$α$ forest and Baryon Acoustic Oscillating (BAO)), we make a global fitting to constrain the mass varying neutrinos. We find that the parameter $δ$, denoting time evolving of neutrino mass, is weakly constrained and the neutrino mass limit today can be relaxed at least by a factor of two. Adding data of $0\nu2β$ decay of Heidelberg-Moscow experiment to our analysis, we find that $δ$ can be constrained tightly and mass varying neutrinos are favored at about 99.7% confidence level.

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Gong-Bo Zhao, Jun-Qing Xia, Xinmin Zhang. 2007-07-17. Probing for variation of neutrino mass with current observations. https://doi.org/10.1088/1475-7516%2F2007%2F07%2F010

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