Primordial Neutrinos, Cosmological Perturbations in Interacting Dark-Energy Model: CMB and LSS

Details Primordial Neutrinos, Cosmological Perturbations in Interacting Dark-Energy Model: CMB and LSS Primordial Neutrinos, Cosmological Perturbations in Interacting Dark-Energy Model: CMB and LSS

2007-05-15

arxiv.org/abs/0705.2134v2

JCAP 0806:005,2008

Astronomy and Astrophysics

Astrophysics

26 pages Revtex, 11 figures, Add new contents and references

Scientific paper

10.1088/1475-7516/2008/06/005

We present cosmological perturbation theory in neutrinos probe interacting dark-energy models, and calculate cosmic microwave background anisotropies and matter power spectrum. In these models, the evolution of the mass of neutrinos is determined by the quintessence scalar field, which is responsible for the cosmic acceleration today. We consider several types of scalar field potentials and put constraints on the coupling parameter between neutrinos and dark energy. Assuming the flatness of the universe, the constraint we can derive from the current observation is $\sum m_{\nu} < 0.87 eV$ at the 95 % confidence level for the sum over three species of neutrinos. We also discuss on the stability issue of the our model and on the impact of the scattering term in Boltzmann equation from the mass-varying neutrinos.

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