Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980phdt........34p&link_type=abstract
Ph.D. Thesis Wisconsin Univ., Madison.
Astronomy and Astrophysics
Astronomy
2
Curvature, Feynman Diagrams, Field Theory (Physics), Perturbation Theory, Quantum Electrodynamics, Black Holes (Astronomy), Operators (Mathematics), Quantum Theory, Relativity, Stimulated Emission
Scientific paper
Perturbation theory was formulated for a self-interacting scalar field and for quantum electrodynamics. It is shown that the effects of interaction and the effect of the curvature can be separated and a diagrammatic interpretation can be given to the terms of the perturbation expansion. The divergences occurring in the low order diagrams in both theories may be removed by an (infinite) rescaling of fields, masses and coupling constants. It is shown that a choice of Feynman propagator implicitly defines the particle states in the past and in the future. Futhermore explicit expressions are obtained for these states and also for an operator that describes the particle creation amplitudes. The question of stimulated emission from black holes is addressed.
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