Finite Quantum Gravity Amplitudes -- no strings attached
High Energy Physics - Theory
2020-11-04 v2 General Relativity and Quantum Cosmology
Abstract
We study the gravity-mediated scattering of scalar fields based on a parameterisation of the Lorentzian quantum effective action. We demonstrate that the interplay of infinite towers of spin zero and spin two poles at imaginary squared momentum leads to scattering amplitudes that are compatible with unitarity bounds, causal, and scale-free at trans-Planckian energy. Our construction avoids introducing non-localities or the massive higher-spin particles that are characteristic in string theory.
Cite
@article{arxiv.2007.00733,
title = {Finite Quantum Gravity Amplitudes -- no strings attached},
author = {Tom Draper and Benjamin Knorr and Chris Ripken and Frank Saueressig},
journal= {arXiv preprint arXiv:2007.00733},
year = {2020}
}
Comments
v2: various small improvements/clarifications, version accepted for publication