A Critique of the Asymptotic Safety Program
High Energy Physics - Theory
2020-03-12 v3 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
Abstract
The present practice of Asymptotic Safety in gravity is in conflict with explicit calculations in low energy quantum gravity. This raises the question of whether the present practice meets the Weinberg condition for Asymptotic Safety. I argue, with examples, that the running of and found in Asymptotic Safety are not realized in the real world, with reasons which are relatively simple to understand. A comparison/contrast with quadratic gravity is also given, which suggests a few obstacles that must be overcome before the Lorentzian version of the theory is well behaved. I make a suggestion on how a Lorentzian version of Asymptotic Safety could potentially solve these problems.
Keywords
Cite
@article{arxiv.1911.02967,
title = {A Critique of the Asymptotic Safety Program},
author = {John F. Donoghue},
journal= {arXiv preprint arXiv:1911.02967},
year = {2020}
}
Comments
40 pages, 1 figure. Final version as published