Boundary States of D-Branes and Dy-Strings

TL;DR

This paper constructs boundary states for D-branes and dy-strings, deriving the string tension formula in type IIB theory, advancing the understanding of bound states with mixed charges.

Contribution

It provides a rigorous construction of boundary states for D-branes and dy-strings, confirming duality predictions for string tensions in type IIB theory.

Findings

Boundary states for D-branes and dy-strings are explicitly constructed.

The string tension formula predicted by duality is derived.

The work supports the consistency of bound states with mixed charges.

Abstract

Polchinski's recent construction of Dirichlet-branes of R-R charges, together with Witten's mechanism for forming bound states of both NS-NS charges and R-R charges, provides a rigorous method to treat these dy-branes. We construct the massless sector of boundary states of D-branes, as well as of dy-strings of charge $(p,1)$. As a consequence, the string tension formula predicted by duality in the type IIB theory is obtained.