T-Duality Group for Open String Theory
Abstract
Description
We study T-duality for open strings on tori $\T^d$. The general boundary conditions for the open strings are constructed, and it is shown that T-duality group, which preserves the mass spectrum of closed strings, preserves also the mass spectrum of the open strings. The open strings are transformed to those with different boundary conditions by T-duality. We also discuss the T-duality for D-brane mass spectrum, and show that the D-branes and the open strings with both ends on them are transformed together consistently.
Latex 14 pages; typos corrected, interpretation and references added, equations unchanged
Latex 14 pages; typos corrected, interpretation and references added, equations unchanged