Growing neutrinos and cosmological selection

Details Growing neutrinos and cosmological selection Growing neutrinos and cosmological selection

2007-06-29

arxiv.org/abs/0706.4427v2

Phys.Lett.B655:201-208,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

new material on time varying constants, new figures, 8 pages, 4 figures

Scientific paper

10.1016/j.physletb.2007.08.060

The time evolution of a cosmological scalar field can be stopped by an increasing mass of the neutrinos. This leads to a transition from a cosmological scaling solution with dynamical dark energy at early time to a cosmological constant dominated universe at late time. The trigger for the transition is set at the time when the neutrinos become non-relativistic. The characteristic mass scale for dark energy is thus related to the neutrino mass, the only known particle physics scale in its vicinity. This explains the ``why now problem'' for dark energy. We present a particle physics realization of this ``growing matter'' scenario. It is based on the very slowly varying mass of a superheavy scalar triplet field whose expectation value dominates the light neutrino masses.

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