Article
Light-like Scattering in Quantum Gravity
Journal of High Energy Physics
(2016)
Abstract
We consider scattering in quantum gravity and derive long-range classical and
quantum contributions to the scattering of light-like bosons and fermions (spin-0, spin- 1
2 ,
spin-1) from an external massive scalar eld, such as the Sun or a black hole. This is achieved
by treating general relativity as an eective eld theory and identifying the non-analytic
pieces of the one-loop gravitational scattering amplitude. It is emphasized throughout the
paper how modern amplitude techniques, involving spinor-helicity variables, unitarity, and
squaring relations in gravity enable much simplied computations. We directly verify, as
predicted by general relativity, that all classical eects in our computation are universal (in
the context of matter type and statistics). Using an eikonal procedure we conrm the post-
Newtonian general relativity correction for light-like bending around large stellar objects. We
also comment on treating eects from quantum ~ dependent terms using the same eikonal
method.
Disciplines
Publication Date
2016
DOI
10.1007/JHEP11(2016)117
Citation Information
John Donoghue, N. E. J Bjerrum-Bohr, Barry R Holstein, Ludovic Plante, et al.. "Light-like Scattering in Quantum Gravity" Journal of High Energy Physics (2016) Available at: http://works.bepress.com/john_donoghue/176/