D branes in string theory, II

TL;DR

This paper reviews boundary states in string theory, focusing on boosted, rotated, and gauge field configurations, and introduces new classical solutions and boundary states for non-BPS states in type I theory.

Contribution

It presents a detailed analysis of boundary states with various properties and constructs a new class of classical solutions and boundary states for non-BPS states in string theory.

Findings

Derived Dirac-Born-Infeld action from boundary states.

Constructed boundary states for non-BPS states in type I theory.

Introduced new classical solutions related to boundary states.

Abstract

In these lectures we review the properties of a boosted and rotated boundary state and of a boundary state with an abelian gauge field deriving from it the Dirac-Born-Infeld action and a newly constructed class of classical solutions. We also review the construction of the boundary state for the stable non-BPS state of type I theory corresponding to the perturbative state present at the first excited level of the SO(32) heterotic string and transforming according to the spinor representation of SO(32) (Lectures presented at the YITP Workshop on ``Developments in Superstring and M-theory'', Kyoto, Japan, October 1999).