Speed of Sound in the Mass Varying Neutrinos Scenario

Abstract

We discuss about the speed of sound squared in the Mass Varying Neutrinos scenario (MaVaNs). Recently, it was argued that the MaVaNs has a catastrophic instability which is the emergence of an imaginary speed of sound at the non-relativistic limit of neutrinos. As the result of this instability, the neutrino-acceleron fluid cannot act as the dark energy. However, it is found that the speed of sound squared in the neutrino-acceleron fluid could be positive in our model. We examine the speed of sound in two cases of the scalar potential. One is the small fractional power-law potential and another is the logarithmic one. The power-law potential model with the right-handed neutrinos gives a stable one.

arXiv comment17 pages, References added, minor modifications

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• Clarifying spherical collapse in coupled dark energy cosmologies
• Stable Models of superacceleration
• Light Sterile Neutrinos and Short Baseline Neutrino Oscillation Anomalies
• Primordial Neutrinos, Cosmological Perturbations in Interacting Dark-Energy Model: CMB and LSS
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• Early dark energy constraints on growing neutrino quintessence cosmologies
• The effect of supersymmetry breaking in the Mass Varying Neutrinos
• False Vacuum in the Supersymmetric Mass Varying Neutrinos Model
• Naturalness and stability of the generalized Chaplygin gas in the seesaw cosmon scenario
• Phenomenology of Hybrid Scenarios of Neutrino Dark Energy
• Probing the variation of relic neutrino masses with extremely high-energy cosmic neutrinos
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