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Paper detail

Proper Time Formalism and Gauge Invariance in Open String Interactions

The issue of gauge invariances in the sigma model formalism is discussed at the free and interacting level. The problem of deriving gauge invariant interacting equations can be addressed using the proper time formalism. This formalism is discussed, both for point particles and strings. The covariant Klein Gordon equation arises in a geometric way from the boundary terms. This formalism is similar to the background independent open string formalism introduced by Witten.

preprint1993arXivOpen access
B. Sathiapalan
hep-th
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