Fermionic cosmologies with Yukawa type interactions

TL;DR

This paper explores how fermionic sources with Yukawa and Nambu-Jona-Lasinio type interactions can drive accelerated expansion phases in a flat universe, revealing a sequence of acceleration, deceleration, and late-time acceleration.

Contribution

It introduces a model combining Yukawa and Nambu-Jona-Lasinio interactions to explain cosmic acceleration phases, a novel approach in fermionic cosmology.

Findings

Initial acceleration driven by fermionic interactions

Transition through a decelerated era

Final eternal acceleration dominated by self-interaction

Abstract

In this work we discuss if fermionic sources could be responsible for accelerated periods in a Friedmann-Robertson-Walker spatially flat universe, including a usual self-interaction potential of the Nambu-Jona-Lasinio type together with a fermion-scalar interaction potential of the Yukawa type. The results show that the combination of these potentials could promote an initially accelerated period, going through a middle decelerated era, with a final eternal accelerated period, where the self-interaction contribution dominates.