Complexification of Gauge Theories

Details Complexification of Gauge Theories Complexification of Gauge Theories

1993-07-22

arxiv.org/abs/hep-th/9307142v1

J.Geom.Phys. 18 (1996) 1-24

Physics

High Energy Physics

High Energy Physics - Theory

25pp., LaTeX, Syracuse SU-GP-93/6-2, Lisbon DF/IST 6.93

Scientific paper

For the case of a first-class constrained system with an equivariant momentum map, we study the conditions under which the double process of reducing to the constraint surface and dividing out by the group of gauge transformations $G$ is equivalent to the single process of dividing out the initial phase space by the complexification $G_C$ of $G$. For the particular case of a phase space action that is the lift of a configuration space action, conditions are found under which, in finite dimensions, the physical phase space of a gauge system with first-class constraints is diffeomorphic to a manifold imbedded in the physical configuration space of the complexified gauge system. Similar conditions are shown to hold in the infinite-dimensional example of Yang-Mills theories. As a physical application we discuss the adequateness of using holomorphic Wilson loop variables as (generalized) global coordinates on the physical phase space of Yang-Mills theory.

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