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

Understand

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.