Neutrino Dark Energy -- Revisiting the Stability Issue

Details Neutrino Dark Energy -- Revisiting the Stability Issue Neutrino Dark Energy -- Revisiting the Stability Issue

2007-05-15

arxiv.org/abs/0705.2018v2

JCAP 0801:026,2008

Astronomy and Astrophysics

Astrophysics

24 pages, 8 figures, stable scenario with negative sound speed squared included, figures added, references added, conclusions

Scientific paper

10.1088/1475-7516/2008/01/026

A coupling between a light scalar field and neutrinos has been widely discussed as a mechanism for linking (time varying) neutrino masses and the present energy density and equation of state of dark energy. However, it has been pointed out that the viability of this scenario in the non-relativistic neutrino regime is threatened by the strong growth of hydrodynamic perturbations associated with a negative adiabatic sound speed squared. In this paper we revisit the stability issue in the framework of linear perturbation theory in a model independent way. The criterion for the stability of a model is translated into a constraint on the scalar-neutrino coupling, which depends on the ratio of the energy densities in neutrinos and cold dark matter. We illustrate our results by providing meaningful examples both for stable and unstable models.

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