Cosmological model with fermion and tachyon fields interacting via Yukawa-type potential

TL;DR

This paper proposes a cosmological model with interacting tachyonic and fermionic fields via a Yukawa potential, explaining different universe expansion phases and the role of field interactions in cosmic evolution.

Contribution

It introduces a novel cosmological model where tachyonic and fermionic fields interact through a Yukawa potential, elucidating their roles in universe acceleration and deceleration phases.

Findings

Tachyonic field drives initial acceleration and later matter-like behavior.

Fermionic field acts as a dark energy component causing late-time acceleration.

Interaction strength influences the duration of the decelerated expansion period.

Abstract

A model for the universe with tachyonic and fermionic fields interacting through a Yukawa-type potential is investigated. It is shown that the tachyonic field answers for the initial accelerated regime and for the subsequent decelerated regime so that it behaves as an inflaton at early times and as a matter field at intermediate times, while the fermionic field has the role of a dark energy constituent, since it leads to an accelerated regime at later times. The interaction between the fields via a Yukawa-type potential controls the duration of the decelerated era, since a stronger coupling makes a shorter decelerated period.