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A quantum mechanical path integral derivation is given of a thermalpropagator in non-static Gui spacetime. The thermal nature of the propagator isunderstood in terms of homotopically non-trivial paths in the configurationspace appropriate to tortoise coordinates. The connection to thermal emissionfrom collapsing black holes is discussed.Comment: 20 pages, major revised version, 9 figures, new titl

Thermal radiation in nonstatic curved spacetimes: Quantum mechanical path integrals and configuration space topology