Speed of Sound in the Mass Varying Neutrinos Scenario

Details Speed of Sound in the Mass Varying Neutrinos Scenario Speed of Sound in the Mass Varying Neutrinos Scenario

2006-01-06

arxiv.org/abs/astro-ph/0601119v2

JHEP 0605 (2006) 021

Astronomy and Astrophysics

Astrophysics

17 pages, References added, minor modifications

Scientific paper

10.1088/1126-6708/2006/05/021

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.

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