Tachyon Condensates and String Theoretic Inflation

TL;DR

This paper explores cosmological solutions derived from string theory, demonstrating that tachyon fields can drive sufficient inflation while satisfying key cosmological constraints.

Contribution

It provides new solutions in string cosmology incorporating tachyon potentials, achieving inflation with graceful exit and density perturbation consistency.

Findings

Achieved sufficient inflation solving flatness and smoothness problems.

Successfully implemented graceful exit and density perturbation constraints.

Derived solutions within the sigma-model frame for conformally flat spacetime.

Abstract

Cosmological solutions of the beta function equations for the background fields of the closed bosonic string are investigated at the one-loop level. Following recent work of Kostelecky and Perry, it is assumed that the spatial sections of the space-time are conformally flat. Working in the sigma-model frame, the non-trivial tachyon potential is utilized to determine solutions with sufficient inflation to solve the smoothness and flatness problems. The graceful exit and density perturbation constraints can also be successfully implemented.