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Your search keyword '"Bjerrum-Bohr, N. E. J."' showing total 2 results
Start Over Author "Bjerrum-Bohr, N. E. J." Topic photons
2 results on '"Bjerrum-Bohr, N. E. J."'

1. Bending of Light in Quantum Gravity.

Author

Bjerrum-Bohr, N. E. J., Donoghue, John F., Holstein, Barry R., Planté, Ludovic, and Vanhove, Pierre

Subjects
*QUANTUM gravity, *QUANTUM theory, *PHOTONS, *RELATIVITY & quantum mechanics, *GENERAL relativity (Physics)
Abstract

We consider the scattering of lightlike matter in the presence of a heavy scalar object (such as the Sun or a Schwarzschild black hole). By treating general relativity as an effective field theory we directly compute the nonanalytic components of the one-loop gravitational amplitude for the scattering of massless scalars or photons from an external massive scalar field. These results allow a semiclassical computation of the bending angle for light rays grazing the Sun, including long-range h contributions. We discuss implications of this computation, in particular, the violation of some classical formulations of the equivalence principle. [ABSTRACT FROM AUTHOR]

Published
2015
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2. Graviton-photon scattering.

Author

Bjerrum-Bohr, N. E. J., Holstein, Barry R., Planté, Ludovic, and Vanhove, Pierre

Subjects
*COMPTON scattering, *ABELIAN equations, *QUANTUM electrodynamics, *PHOTONS, *GRAVITONS
Abstract

We use the feature that the gravitational Compton scattering amplitude factorizes in terms of Abelian QED amplitudes to evaluate various gravitational Compton processes. We examine both the QED and gravitational Compton scattering from a massive spin-1 system by the use of helicity amplitude methods. In the case of gravitational Compton scattering we show how the massless limit can be used to evaluate the cross section for graviton-photon scattering and discuss the difference between photon interactions and the zero mass spin-1 limit. We show that the forward scattering cross section for graviton photoproduction has a very peculiar behavior, differing from the standard Thomson and Rutherford cross sections for a Coulomb-like potential. [ABSTRACT FROM AUTHOR]

Published
2015
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