Quantum Gravitational Corrections in Cosmology

TL;DR

This paper develops a method to calculate quantum gravitational corrections in cosmology using the effective action formalism, applicable to any UV-complete quantum gravity theory, emphasizing the importance of the full effective action for consistent solutions.

Contribution

It introduces a model-independent approach to compute quantum gravitational effects in cosmology using the effective action formalism, applicable across various theories.

Findings

Effective action formalism enables reliable quantum gravity corrections in cosmology.

Full effective action is essential for renormalization group invariant solutions.

Method applies to any UV-complete quantum gravity theory with low-energy general relativity.

Abstract

We show how to reliably calculate quantum gravitational corrections to cosmological models using the unique effective action formalism for quantum gravity. Our calculations are model independent and apply to any ultra-violet complete theory of quantum gravity that admit general relativity as a low energy theory. We show that it is important to consider the full effective action to obtain renormalization group invariant solutions. We investigate the validity range of our techniques within simple cosmological models.