Renormalizable and unitary Lorentz invariant model of quantum gravity

TL;DR

This paper discusses a quantum gravity model combining R + R2 terms that is both renormalizable and unitary, aligning with General Relativity at large scales through parameter choices.

Contribution

It presents a self-consistent quantum gravity model with quadratic curvature terms that is both renormalizable and unitary, advancing theoretical understanding.

Findings

The R + R2 model is proven to be renormalizable and unitary.

Proper parameter choices make the model indistinguishable from General Relativity at large scales.

The model offers a viable quantum theory of gravity consistent with known physics.

Abstract

We analyze the R + R2 model of quantum gravity where terms quadratic in the curvature tensor are added to the General Relativity action. This model was recently proved to be a self-consistent quantum theory of gravitation, being both renormalizable and unitary. The model can be made practically indistinguishable from General Relativity at astrophysical and cosmological scales by the proper choice of parameters.