Tachyon condensation and Boundary States in Bosonic String

TL;DR

This paper explores tachyon condensation in unoriented bosonic string theory, linking it to gauge symmetry emergence and boundary state descriptions, emphasizing orbifold conformal field theory roles.

Contribution

It provides a boundary state framework for tachyon condensation in bosonic strings, connecting gauge symmetry and orbifold CFT techniques.

Findings

Tachyon condensation leads to SO(32) gauge symmetry in 10D

Boundary state description clarifies the condensation process

Orbifold CFT plays a key role in the analysis

Abstract

We discuss tachyon configuration for the unoriented bosonic string theory which produces a bosonic string theory with SO(32) gauge symmetry in ten dimensions. It is closely related to the tachyon condensation scenario proposed by A. Sen. We also give the boundary state description of the tachyon condensation process, with some emphasis on the r\^ole of orbifold conformal field theory.