Probing for Dynamics of Dark-Energy in Mass Varying Neutrinos: Cosmic Microwave Background Radiation and Large Scale Structure

TL;DR

This paper develops cosmological perturbation theory for neutrino-interacting dark energy models, analyzing their effects on cosmic microwave background anisotropies and large-scale structure, and constrains neutrino mass and coupling parameters using current observations.

Contribution

It introduces a framework for studying neutrino mass variation driven by dark energy scalar fields and provides observational constraints on model parameters.

Findings

Neutrino mass sum constrained to < 0.87 eV at 95% confidence

Cosmological perturbation theory developed for neutrino-dark energy interactions

Constraints on coupling parameters between neutrinos and dark energy

Abstract

We present cosmological perturbation theory in neutrino 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.