Brane World Inflation with Scalar and Tachyon Fields

TL;DR

This paper develops inflationary models in braneworld cosmology using scalar and tachyon fields, showing that inflation can occur without potential restrictions, with distinct conditions for each field type.

Contribution

It introduces a method to model inflation with scalar and tachyon fields in braneworld scenarios without potential restrictions, highlighting differences in their inflationary conditions.

Findings

Inflation with scalar fields is potential-independent.

Tachyonic inflation requires specific initial conditions.

Tachyon inflation can start from t > t_o.

Abstract

We present inflationary models of the early universe in the braneworld scenario considering both scalar field and tachyon field separately. The technique of Chervon and Zhuravlev to obtain inflationary cosmological models without restrictions on a scalar field potential is employed here. We note that like scalar field, the inflationary solution obtained here with tachyon field also does not depend on its potential. However, unlike scalar field, inflation with tachyon is obtained for a restricted domains of the field to begin with. We obtain potentials for which one gets inflation using both scalar field and tachyon field separately. It is found that unlike the scalar field, the tachyonic field inflation sceanario can be realized from t > t_o.