Topological contributions in two-dimensional Yang-Mills theory: from group averages to integration over algebras

Bassetto, A.; Nicoli, S.; Vian, F.

Topological contributions in two-dimensional Yang-Mills theory: from group averages to integration over algebras

Authors

Bassetto, A.

Nicoli, S.

Vian, F.

Description

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.
11 pages, revtex