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Particles and Fields
Eur. Phys. J. C 13, 695-697
DOI 10.1007/s100520000175

Chan-Paton soliton gauge states of the compactified open string

Jen-Chi Lee

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

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