Radiative processes in external gravitational fields

Abstract

Kinematically forbidden processes may be allowed in the presence of external gravitational fields. These ca be taken into account by introducing generalized particle momenta. The corresponding transition probabilities can then be calculated to all orders in the metric deviation from the field-free expressions by simply replacing the particle momenta with their generalized counterparts. The procedure applies to particles of any spin and to any gravitational fields. transition probabilities, emission power, and spectra are, to leading order, linear in the metric deviation. It is also shown how a small dissipation term in the particle wave equations can trigger a strong backreaction that introduces resonances in the radiative process and deeply affects the resulting gravitational background.

5 pages, 1 figure

References in corpus (4)

• Neutrino optics and oscillations in gravitational fields
• Spin-2 particles in gravitational fields
• Spin-gravity coupling and gravity-induced quantum phases
• Optics of spin-1 particles from gravity-induced phases

Cited by in corpus (6)

• Covariance and gauge invariance in relativistic theories of gravity
• Classical and Quantum Aspects of Particle Propagation in External Gravitational Fields
• Maximal acceleration and radiative processes
• Structured objects in quantum gravity. The external field approximation
• Long range order in gravity
• Condensation phenomena in gravity