Relic neutrinos and cosmic background radiation: a new way of comparison

TL;DR

This paper introduces a new equation of state for relic neutrinos, comparing their thermal properties with cosmic background radiation, revealing a temperature ratio and entropy relationship.

Contribution

It proposes an extended MIT bag model to describe relic neutrinos' thermal behavior considering gravitational effects and fermionic nature.

Findings

Relic neutrino temperature is 3/4 of photon temperature.

The entropy ratio between relic neutrinos and photons is estimated.

New equation of state aligns neutrino properties with cosmic background data.

Abstract

A new equation of state is proposed in order to describe the thermal behavior of relic neutrinos. It is based on extensions of the MIT bag model to deal with the gravitational interaction and takes in account the fermionic character of neutrinos. The results for the temperature and entropy of relic neutrinos are compared with those of the cosmic background radiation, treated as a gas of photons at the temperature of 2.726 K. In particular, it is found that the temperature of the relic neutrinos is 3/4 of that of the photon gas. The ratio between the two entropies is also estimate.