Neutrino masses and the dark energy equation of state - relaxing the cosmological neutrino mass bound

Details Neutrino masses and the dark energy equation of state - relaxing the cosmological neutrino mass bound Neutrino masses and the dark energy equation of state - relaxing the cosmological neutrino mass bound

2005-05-27

arxiv.org/abs/astro-ph/0505551v3

Phys.Rev.Lett.95:221301,2005

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, minor changes, matches version to appear in PRL

Scientific paper

10.1103/PhysRevLett.95.221301

Cosmology at present provides the nominally strongest constraint on the masses of standard model neutrinos. However, this constraint extremely dependent on the nature of the dark energy component of the Universe. When the dark energy equation of state parameter is taken as a free (but constant) parameter, the neutrino mass bound is sum m_nu < 1.48 eV (95% C.L.), compared with sum m_nu < 0.65 eV (95% C.L.) in the standard model where the dark energy is in the form of a cosmological constant. This has important consequences for future experiments aimed at the direct measurement of neutrino masses. We also discuss prospects for future cosmological measurements of neutrino masses.

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