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Department of Physics and Prairie Particle Physics Institute, University of Regina, Regina,Sask S4S 0A2, Canada





Academic Editor: Lorenzo Iorio

Abstract Single-vertex Feynman diagrams represent the dominant contribution to physical processes, but are frequently forbidden kinematically. This is changed when the particles involved propagate in a gravitational background and acquire an effective mass. Procedures are introduced that allow the calculation of lowest order diagrams, their corresponding transition probabilities, emission powers and spectra to all orders in the metric deviation, for particles of any spin propagating in gravitational fields described by any metric. Physical properties of the -space-time medium- are also discussed. It is shown in particular that a small dissipation term in the particle wave equations can trigger a strong back-reaction that introduces resonances in the radiative process and affects the resulting gravitational background. View Full-Text

Keywords: gravitational Berry phase; radiative processes in gravitation; optical properties of space-time; covariant wave equations; gravitational effects gravitational Berry phase; radiative processes in gravitation; optical properties of space-time; covariant wave equations; gravitational effects





Autor: Giorgio Papini

Fuente: http://mdpi.com/



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