Asymptotically Safe Gravitons in Electroweak Precision Physics

TL;DR

This paper investigates how asymptotically safe gravitons influence electroweak precision measurements, revealing that constraints on models with extra dimensions are less restrictive than previously thought, especially as the number of extra dimensions increases.

Contribution

It provides the first calculation of graviton contributions to the rho parameter within the asymptotic safety framework, highlighting differences from effective field theory predictions.

Findings

Constraints on models with more than three extra dimensions are weakened.

Trans-Planckian contributions grow with the number of extra dimensions.

Asymptotic safety alters the expected impact of gravitons on precision observables.

Abstract

Asymptotic safety offers a field theory based UV completion to gravity. For low Planck scales, gravitational effects on low-energy precision observables cannot be neglected. We compute the contribution to the rho parameter from asymptotically safe gravitons and find that in contrast to effective theory, constraints on models with more than three extra dimensions are significantly weakened. The relative size of the trans-Planckian contribution increases proportional to the number of extra dimensions.