Role of Tachyonic Field in Accelerating Universe in Presence of Perfect Fluid

TL;DR

This paper investigates how tachyonic fields combined with perfect fluids, including barotropic and generalized Chaplygin gas, can explain the universe's acceleration, providing exact solutions and analyzing the effects of interaction decay.

Contribution

It introduces a model combining tachyonic and perfect fluids with interaction decay, deriving exact solutions and analyzing potential variations over time.

Findings

Interaction term decays with time

Potentials decrease as interaction reduces

Exact solutions for density and tachyonic field obtained

Abstract

Recently tachyonic field has been depicted as dark energy model to represent the present acceleration of the Universe. In this paper we have considered mixture of tachyonic fluid with a perfect fluid. For this purpose we have considered barotropic fluid and Generalized Chaplygin gas(G.C.G.). We have considered a particular form of the scale factor. We have solved the equations of motion to get the exact solutions of the density, tachyonic potential and the tachyonic field. We have introduced a coupling term to show that the interaction decays with time. Also we have shown that the nature of the potentials vary so as the interaction term reduces the potential in both the cases.