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Quantum topological invariants, gravitational instantons and the topological embedding

Damiano Anselmi

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Certain topological invariants of the moduli space of gravitational instantons are defined and studied. Several amplitudes of two- and four-dimensional topological gravity are computed. A notion of puncture in four dimensions, which is particularly meaningful in the class of Weyl instantons, is introduced. The topological embedding, a theoretical framework for constructing physical amplitudes that are well defined order-by-order in perturbation theory around instantons, is explicitly applied to the computation of the correlation functions of Dirac fermions in a punctured gravitational background, as well as to the most general QED and QCD amplitude. Various alternatives are worked out, discussed and compared. The quantum background affects the propagation by generating a certain effective `quantum' metric. The topological embedding could represent a new chapter of quantum field theory.


PACS

11.10.-z Field theory

04.60.-m Quantum gravity

MSC

83Cxx General relativity

81T45 Topological field theories (See also 57R56, 58Dxx)

Subjects

Gravitation and cosmology

Particle physics and field theory

Dates

Issue 8 (August 1997)

Received 12 August 1996, in final form 28 February 1997



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