Fermions in a Walecka-type cosmology

TL;DR

This paper explores a simplified Walecka-type cosmological model with fermionic, scalar, and vector fields, demonstrating their interactions can drive transitions between accelerated and decelerated expansion phases in the universe.

Contribution

It introduces a novel simplified Walecka-type model in cosmology, highlighting the role of fermionic fields in cosmic acceleration transitions.

Findings

Fermionic, scalar, and vector fields influence cosmic expansion phases.

Interactions can cause transitions between accelerated and decelerated regimes.

Fermionic fields promote accelerated expansion in early and late universe.

Abstract

A simplified Walecka-type model is investigated in a cosmological scenario. The model includes fermionic, scalar and vector fields as sources. It is shown that their interactions, taking place in a Robertson-Walker metric, could be responsible for the transition of accelerated-decelerated periods in the early universe and a current accelerated regime. It is also discussed the role of the fermionic field as the promoter of the accelerated regimes in the early and the late stages of the universe.