Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1993-09-02
Mod.Phys.Lett.A9:1681-1694,1994
Physics
High Energy Physics
High Energy Physics - Theory
19 pages
Scientific paper
10.1142/S0217732394001520
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.
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