Brane - Antibrane as a Defect of Tachyon Condensation

TL;DR

This paper constructs a classical brane-antibrane solution in tachyon effective field theory, analyzes supersymmetry breaking, and discusses potential pair-annihilation processes, providing insights into defect dynamics in string theory.

Contribution

It introduces a novel classical solution representing a brane-antibrane pair in tachyon theory and analyzes its supersymmetry and stability properties.

Findings

Energy estimation indicates string excitation between branes.

Supersymmetry is broken by the coexistence of brane and antibrane.

Possible pair-annihilation processes are discussed.

Abstract

In a tachyon effective field theory of a non-BPS brane, we construct a classical solution representing a parallel brane-antibrane. The solution is made of a kink and an antikink placed at antipodal points of S^1. Estimation of the brane energy suggests an excitation of a string connecting the two branes, even though the theory is Abelian. We performed fluctuation analysis around the obtained solution, and find the structure of the supersymmetry breaking by the co-existence of the brane and the antibrane. We discuss possible processes of the pair-annihilation of the brane defect.