English

Scales and hierachies in asymptotically safe quantum gravity: a review

General Relativity and Quantum Cosmology 2019-01-08 v1 High Energy Physics - Theory

Abstract

The asymptotic safety program strives for a consistent description of gravity as a non-perturbatively renormalizable quantum field theory. In this framework the gravitational interactions are encoded in a renormalization group flow connecting the quantum gravity regime at trans-Planckian scales to observable low-energy physics. Our proceedings reviews the key elements underlying the predictive power of the construction and summarizes the state-of-the-art in determining its free parameters. The explicit construction of a realistic renormalization group trajectory describing our world shows that the flow dynamically generates two scales: the Planck scale where Newton's coupling becomes constant and a terrestrial scale where the cosmological constant freezes out. We also review the perspectives of determining the free parameters of the theory through cosmological observations.

Keywords

Cite

@article{arxiv.1901.01731,
  title  = {Scales and hierachies in asymptotically safe quantum gravity: a review},
  author = {Frank Saueressig and Giulia Gubitosi and Chris Ripken},
  journal= {arXiv preprint arXiv:1901.01731},
  year   = {2019}
}

Comments

18 pages, 5 figures. Prepared for submission to Foundations of Physics: S.I.: Naturalness, Hierarchy, and Fine-Tuning