Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-06-20
Int.J.Mod.Phys. A16 (2001) 1443-1462
Physics
High Energy Physics
High Energy Physics - Theory
20 pages, no figure
Scientific paper
We formulate path integrals on any Riemannian manifold which admits the action of a compact Lie group by isometric transformations. We consider a path integral on a Riemannian manifold M on which a Lie group G acts isometrically. Then we show that the path integral on M is reduced to a family of path integrals on a quotient space Q=M/G and that the reduced path integrals are completely classified by irreducible unitary representations of G. It is not necessary to assume that the action of G on M is either free or transitive. Hence our formulation is applicable to a wide class of manifolds, which includes inhomogeneous spaces, and it covers all the inequivalent quantizations. To describe the path integral on inhomogeneous space, stratification geometry, which is a generalization of the concept of principal fiber bundle, is necessarily introduced. Using it we show that the path integral is expressed as a product of three factors; the rotational energy amplitude, the vibrational energy amplitude, and the holonomy factor. When a singular point arises in $ Q $, we determine the boundary condition of the path integral kernel for a path which runs through the singularity.
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