Two-Loop Quantum Gravity Corrections to Cosmological Constant in Landau Gauge

TL;DR

This paper calculates two-loop quantum gravity corrections to the cosmological constant within a renormalizable conformal gravity framework, proposing a potential dynamical solution to the cosmological constant problem.

Contribution

It provides the first two-loop quantum gravity correction calculations to the cosmological constant in a conformal gravity model formulated with dimensional regularization.

Findings

Two-loop corrections suggest a dynamical solution to the cosmological constant problem.

Use of Landau gauge reduces complexity and uncertainties in calculations.

The model maintains renormalizability and incorporates conformal anomalies.

Abstract

The anomalous dimensions of the Planck mass and the cosmological constant are calculated in a renormalizable quantum conformal gravity with a single dimensionless coupling, which is formulated using dimensional regularization on the basis of Hathrell's works for conformal anomalies. The dynamics of the traceless tensor field is handled by the Weyl action, while that of the conformal-factor field is described by the induced Wess-Zumino actions, including the Riegert action as the kinetic term. Loop calculations are carried out in Landau gauge in order to reduce the number of Feynman diagrams as well as to avoid some uncertainty. Especially, we calculate two-loop quantum gravity corrections to the cosmological constant. It suggests that there is a dynamical solution to the cosmological constant problem.