Cosmological Model of Interacting Tachyon Field

TL;DR

This paper develops a cosmological model featuring an interacting tachyon field and scalar fields, deriving exact solutions via a novel first order formalism to better understand their combined dynamics.

Contribution

It introduces a new approach to modeling tachyon interactions through an explicit potential, extending beyond phenomenological descriptions, and derives exact solutions using first order formalism.

Findings

Different types of exact solutions obtained.

Interaction modeled through potential in the Lagrangian.

Enhanced understanding of tachyon and scalar field dynamics.

Abstract

In this paper we investigate a tachyon field model in cosmology, provided its interaction with the quintessence or phantom fields.The model takes into account this interaction beyond the usual approach, in which the interaction is phenomenologically described by the energy flow between the matter components. In our model, the interaction of tachyon field with a canonical scalar field is taken into account through the interaction potential in the total Lagrangian of the system, like in the case of two or more canonical scalar fields. We obtain the different types of exact solution for the model by employing the so-called "first order formalism" procedures.