A Cosmological Model with Fermionic Field

TL;DR

This paper explores a string/M-theory inspired cosmological model incorporating a non-Dirac fermionic field with interactions, demonstrating its role in early inflation and late-time acceleration, with minimal impact from higher-order terms.

Contribution

It introduces a novel fermionic field model with interaction terms affecting cosmological evolution, bridging early inflation and dark energy phenomena.

Findings

Fermionic field acts as an inflation driver in the early universe.

Interaction terms enhance late-time cosmic acceleration.

Higher order Lagrangian terms have negligible effects on inflation and acceleration.

Abstract

In this work, a cosmological model inspired by string/M- theory with fermionic field is taken into consideration. Here it is investigated whether the introduction of a non-Dirac fermionic field--characterized by an \textit{interaction term}--affects the cosmological evolution. The self-interaction potential is considered as a combination of the scalar and pseudo-scalar invariants. It is observed that the fermionic field under consideration behaves like an inflation field for the early Universe and later on, as a dark energy field. The late time acceleration becomes more prominent by the addition of the interaction term. There is a slight decrease for the inflation peak as well as for the energy density. We see that addition of higher order terms to the fermionic part of Lagrangian does not significantly change either the inflation or the late time acceleration behavior.