Cosmic coincidences and relic neutrinos

Details Cosmic coincidences and relic neutrinos Cosmic coincidences and relic neutrinos

2006-12-04

arxiv.org/abs/astro-ph/0612079v1

J.Phys.A40:7011-7016,2007

Astronomy and Astrophysics

Astrophysics

7 pages, LaTeX, based on the on the talk at IRGAC-2006 (Barcelona, July 11-15, 2006), accepted for publication in Journal of P

Scientific paper

10.1088/1751-8113/40/25/S54

A simple phenomenological description for the energy transfer between a variable cosmological constant (CC) and a gas of relic neutrinos in an expanding universe can account for a near coincidence between the neutrino and dark-energy densities to hold over a significant portion of the history of the universe. Although such a cosmological setup may promote neutrinos to mass-varying particles, both with slow and quick neutrino mass changing with the expansion of the universe naturally implemented in the model, it also works equally well for static neutrino masses. We also stress what sort of models for variable CC can potentially underpin the above scenario.

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