Cosmological Scaling Solutions with Tachyon:Modified Gravity Model

TL;DR

This paper investigates cosmological scaling solutions within modified gravity models involving a tachyon scalar field, providing a general method to compute the scaling potential applicable to various modifications.

Contribution

It introduces a universal prescription for calculating the scaling potential in modified gravity models with tachyon fields, applicable to diverse modifications.

Findings

Derived a general method for scaling potential calculation

Applied method to specific modified gravity examples

Demonstrated compatibility with late-time cosmic acceleration

Abstract

Modifying the Einstein's gravity at large distance scales is one of the interesting proposals to explain the late time acceleration of the universe. In this paper, we analyse scaling solutions in modified gravity models where the universe is sourced by a background matter fluid together with a tachyon type scalar field. We describe a general prescription to calculate the scaling potential in such models. Later on, we consider specific examples of modifications and apply our method to calculate the scaling potential and the scale factor. Our method can be applied to any modified gravity model, in presence of a tachyon field.