Topological contributions in two-dimensional Yang-Mills theory: from group averages to integration over algebras
نویسنده
چکیده
We show that keeping only the topologically trivial contribution to the average of a class function on U (N) amounts to integrating over its algebra. The goal is reached first by decompactifying an expansion over the instanton basis and then directly, by means of a geometrical procedure. Keywords: Yang-Mills in two dimensions, invariant integration over groups and related algebras.
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تاریخ انتشار 2008