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 e ective 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 simpli ed computations. We directly verify, as
predicted by general relativity, that all classical e ects in our computation are universal (in
the context of matter type and statistics). Using an eikonal procedure we con rm the post-
Newtonian general relativity correction for light-like bending around large stellar objects. We
also comment on treating e ects 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/