Anomalous U(1) gauge symmetries and heterotic-typeI/II string duality

Physics – High Energy Physics – High Energy Physics - Theory

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7 pages, Latex, JHEP, Contribution to the Proceedings of TMR99, European Program Meeting on Quantum Aspects of Gauge Theories,

Scientific paper

Anomalous U(1) gauge symmetries can appear both in heterotic and type I string theories. In the heterotic case we find a single anomalous U(1), while in open string theories several such symmetries can appear. Nonetheless, there is a conjectured duality symmetry that might connect these two theories. We review the properties of anomalous gauge symmetries in various string theories as well as the status of this heterotic-type I/II duality. We also comment on the possible phenomenological applications of anomalous gauge symmetries in string theory.

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