Neutrino Dark Energy -- Revisiting the Stability Issue
arXiv:0705.2018 · doi:10.1088/1475-7516/2008/01/026
Abstract
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.
24 pages, 8 figures, stable scenario with negative sound speed squared included, figures added, references added, conclusions unchanged. Matches version to be published in JCAP
References in corpus (3)
Cited by in corpus (15)
- Phenomenology with Massive Neutrinos
- Large-scale instability in interacting dark energy and dark matter fluids
- Coupled and Extended Quintessence: theoretical differences and structure formation
- Growing Matter
- Constraining Interactions in Cosmology's Dark Sector
- Adiabatic instability in coupled dark energy-dark matter models
- Effects of dark sectors' mutual interaction on the growth of structures
- Neutrino clustering in growing neutrino quintessence
- Microscopic and Macroscopic Behaviors of Palatini Modified Gravity Theories
- Neutrino Lumps in Quintessence Cosmology
- Coupling dark energy with Standard Model states
- Challenging the Cosmological Constant
- Relaxing neutrino mass bounds by a running cosmological constant
- False Vacuum in the Supersymmetric Mass Varying Neutrinos Model
- Growing neutrino cosmology