Amplitudes, resonances, and the ultraviolet completion of gravity
Abstract
This paper constructs, making use of the onshell spinorhelicity formalism, a possible ultraviolet completion of gravity following a "bottomup" approach. The assumptions of locality, unitarity, and causality i) require an infinite tower of resonances with increasing spin and quantized mass, ii) introduce a duality relation among crossed scattering channels, and iii) dress all gravitational amplitudes in the Standard Model with a form factor that closely resembles either the Veneziano or the VirasoroShapiro amplitude in string theory. As a consequence of unitarity, the theory predicts leading order deviations from General Relativity in the coupling of gravity to fermions that could be explained if spacetime has torsion in addition to curvature.
 Publication:

Physical Review D
 Pub Date:
 November 2019
 DOI:
 10.1103/PhysRevD.100.095013
 arXiv:
 arXiv:1906.11687
 Bibcode:
 2019PhRvD.100i5013A
 Keywords:

 High Energy Physics  Phenomenology;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Theory
 EPrint:
 22 pages (twocolumn layout), 3 figures