Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2002-03-04
J.Phys. A35 (2002) R1-5794
Physics
High Energy Physics
High Energy Physics - Theory
63 pages
Scientific paper
10.1088/0305-4470/35/28/201
First, we review the basic mathematical structures and results concerning the gauge orbit space stratification. This includes general properties of the gauge group action, fibre bundle structures induced by this action, basic properties of the stratification and the natural Riemannian structures of the strata. In the second part, we study the stratification for theories with gauge group $\rmSU(n)$ in space time dimension 4. We develop a general method for determining the orbit types and their partial ordering, based on the 1-1 correspondence between orbit types and holonomy-induced Howe subbundles of the underlying principal $\rmSU(n)$-bundle. We show that the orbit types are classified by certain cohomology elements of space time satisfying two relations and that the partial ordering is characterized by a system of algebraic equations. Moreover, operations for generating direct successors and direct predecessors are formulated, which allow one to construct the set of orbit types, starting from the principal one. Finally, we discuss an application to nodal configurations in topological Chern-Simons theory.
Rudolph Gerd
Schmidt Matthias
Volobuev Igor P.
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