Fermions as sources of accelerated regimes in cosmology

TL;DR

This paper explores how fermionic fields with specific self-interactions and energy transfer processes could drive accelerated expansion phases in the universe, acting as inflaton or dark energy.

Contribution

It introduces a model where fermionic sources cause accelerated cosmological regimes, considering self-interactions and irreversible energy transfer.

Findings

Fermionic fields can mimic inflaton behavior in early universe

Fermionic sources can act as dark energy in later universe

Energy transfer processes influence acceleration dynamics

Abstract

In this work it is investigated if fermionic sources could be responsible for accelerated periods during the evolution of a universe where a matter field would answer for the decelerated period. The self-interaction potential of the fermionic field is considered as a function of the scalar and pseudo-scalar invariants. Irreversible processes of energy transfer between the matter and gravitational fields are also considered. It is shown that the fermionic field could behave like an inflaton field in the early universe and as dark energy for an old universe.