Amplitudes, resonances, and the ultraviolet completion of gravity
Abstract
This paper constructs, making use of the on-shell spinor-helicity formalism, a possible ultraviolet completion of gravity following a "bottom-up" 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 Virasoro-Shapiro 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 space-time 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
- E-Print:
- 22 pages (two-column layout), 3 figures