Illuminating Light Bending
N.E.J. Bjerrum-Bohr, Barry R. Holstein, John F. Donoghue, Ludovic, Plant\'e, Pierre Vanhove

TL;DR
This paper calculates graviton interactions with matter, showing they can be expressed through electromagnetic forms, and discusses light bending phenomena from a quantum perspective, offering new insights beyond classical general relativity.
Contribution
It introduces a quantum field theory approach to graviton interactions, revealing factorization into electromagnetic forms and exploring light bending from a novel viewpoint.
Findings
Graviton scattering amplitudes factorize into electromagnetic forms
Cross sections are computed using helicity methods
Extrapolation yields photon-graviton and graviton-graviton scattering amplitudes
Abstract
The interactions of gravitons with spin-1 matter are calculated in parallel with the well known photon case. It is shown that graviton scattering amplitudes can be factorized into a product of familiar electromagnetic forms, and cross sections for various reactions are straightforwardly evaluated using helicity methods. Universality relations are identified. Extrapolation to zero mass yields scattering amplitudes for photon-graviton and graviton-graviton scattering. The phenomenon of light bending near a massive object, which is generally treated using classical general relativity, is discussed from alternative points of view.
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Taxonomy
TopicsRelativity and Gravitational Theory · Pulsars and Gravitational Waves Research · Cosmology and Gravitation Theories
