Renormalization group approaches to Quantum Gravity and Tensions in Modern Cosmology

TL;DR

This paper explores how asymptotic safety in quantum gravity, with running constants G_N and b5, impacts astrophysical observations like supernovae and gravitational lensing, highlighting potential cosmological tensions.

Contribution

It analyzes the phenomenological implications of asymptotic safety for quantum gravity on observational cosmology and gravitational lensing measurements.

Findings

Running G_N and b5 affect distance measurements from SNIa light curves.

Impacts on strong and weak gravitational lensing are discussed.

Potential tensions in cosmological data are identified.

Abstract

Asymptotic Safety is a promising framework towards the understanding, in a non-perturbative way, of Quantum Gravity. It treats the Newton's constant G_N and the cosmological constant \Lambda as running coupling of an effective action. At the phenomenological point of view the values of G_N and \Lambda depend on the energy density of the system under consideration. This fact has interesting astrophysical and cosmological consequences. The present work discusses the effects on the distance measurements from SNIa light curves and on the strong and weak gravitational lensing measurements.