Tachyon Matter in Boundary String Field Theory

TL;DR

This paper investigates the decay of unstable D-branes in superstring theory through boundary string field theory, showing tachyon matter formation and exploring cosmological implications of rolling tachyons.

Contribution

It demonstrates that solutions of the tachyon field evolve to produce tachyon matter and analyzes cosmological evolution driven by rolling tachyons using BSFT.

Findings

Tachyon field solutions asymptotically approach T=x^0

Pressure rapidly diminishes at late times

Cosmological evolution influenced by rolling tachyon

Abstract

We analyse the classical decay process of unstable D-branes in superstring theory using the boundary string field theory (BSFT) action. We show that the solutions of the equations of motion for the tachyon field asymptotically approach to T=x^0 and the pressure rapidly falls off at late time producing the tachyon matter irrespective of the initial condition. We also consider the cosmological evolution driven by the rolling tachyon using the BSFT action as an effective action.