Cosmology With Non-Minimally Coupled K-Field

TL;DR

This paper explores the cosmological implications of a non-minimally coupled scalar field with a Dirac-Born-Infeld kinetic term, demonstrating its potential to produce inflation and late-time acceleration with attractor solutions.

Contribution

It introduces a non-minimally coupled DBI-type scalar field model and analyzes its ability to generate inflation and late-time acceleration with attractor behavior.

Findings

Possible inflationary solutions in early universe

Late-time accelerating phases observed

Solutions exhibit attractor properties independent of initial conditions

Abstract

We consider non-minimally coupled (with gravity) scalar field with non-canonical kinetic energy. The form of the kinetic term is of Dirac-Born-Infeld (DBI) form.We study the early evolution of the universe when it is sourced only by the k-field, as well as late time evolution when both the matter and k-field are present. For the k-field, we have considered constant potential as well as potential inspired from Boundary String Field Theory (B-SFT). We show that it is possible to have inflationary solution in early time as well as late time accelerating phase. The solutions also exhibit attractor property in a sense that it does not depend on the initial conditions for a certain values of the parameters.