Foundational Problems in Quantum Gravity

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Boundary conditions play a crucial role in the path-integral approach to quantum gravity and quantum cosmology, as well as in the current attempts to understand the one-loop semiclassical properties of quantum field theories. Within this framework, one is led to consider boundary conditions completely invariant under infinitesimal diffeomorphisms on metric perturbations. These are part of a general scheme, which can be developed for Maxwell theory, Yang-Mills Theory, Rarita-Schwinger fields and any other gauge theory. A general condition for strong ellipticity of the resulting field theory on manifolds with boundary is here proved, following recent work by the authors. The relevance for Euclidean quantum gravity is eventually discussed.
12 pages, plain Tex, contribution to the Italian XIII National Conference on General Relativity, Monopoli, September 1998

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General Relativity and Quantum Cosmology

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http://salesiana.dossiersoluciones.com/handle/123456789/36436

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/gr-qc/9902042
 http://arxiv.org/abs/gr-qc/9902042

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arXiv