DOI 10.1007/s100520000175
Chan-Paton soliton gauge states of the compactified open string
Department of Electrophysics, National Chiao-Tung
University, Hsinchu,
Taiwan, 30050, R.O.C.
Received: 14 May 1999 / Published online: 17 March 2000 - © Springer-Verlag 2000
Abstract
We study the mechanism of the enhanced gauge symmetry of the
bosonic
open string
compactified on a torus by analyzing the zero-norm soliton (non-zero
winding of
the Wilson line) gauge states in the spectrum. Unlike the closed
string case, we
find that the soliton gauge state exists only at massive levels.
These
soliton gauge states correspond to the existence of enhanced
massive gauge
symmetries with transformation parameters containing both Einstein
and
Yang-Mills indices. In the T-dual picture, these symmetries
exist
only at
some discrete values of compactified radii when N D-branes
are
coincident.
Copyright Società Italiana di Fisica, Springer-Verlag 2000