D-Brane Boundary State Dynamics

TL;DR

This paper develops boundary states for time-dependent D-branes to study their quantum dynamics, revealing moduli related to chiral excitations and supporting the consistency of string soliton theories.

Contribution

It introduces a systematic method for constructing boundary states for dynamic D-branes, linking soliton excitations to fundamental string states.

Findings

D-strings possess exact moduli for chiral excitations

These excitations are dual to BPS states of Type IIB strings

Supports Polchinski's approach to string soliton physics

Abstract

We construct the open string boundary states corresponding to various time-dependent deformations of the D-brane and explore several ways in which they may be used to study stringy soliton collective coordinate quantum dynamics. Among other things, we find that D-strings have exact moduli corresponding to arbitrary chiral excitations of the basic soliton. These are presumably the duals of the BPS-saturated excitations of the fundamental Type IIB string. These first steps in a systematic study of the dynamics and interactions of Dirichlet-brane solitons give further evidence of the consistency of Polchinski's new approach to string soliton physics.