Eternal Inflation: Prohibited by Quantum Gravity?

TL;DR

This paper examines various quantum gravity principles and inflation models, providing evidence that quantum gravity effects likely prohibit the occurrence of eternal inflation.

Contribution

It offers a comprehensive analysis of multiple quantum gravity features and inflation models, concluding that they collectively disfavor eternal inflation.

Findings

Quantum gravity features do not support eternal inflation.

Phenomenological inflation models are incompatible with eternal inflation.

Evidence suggests quantum gravity prohibits eternal inflation.

Abstract

We investigate how eternal inflation is affected by quantum gravity effects. We consider general features of quantum gravity, such as renormalizability, complementarity, minimal length, definition of observables, and weak gravity conjecture. We also consider phenomenological models such as ghost inflation, non-commutative inflation, brane inflation, k-inflation and resonant tunneling. We find that all these features and models do not support eternal inflation. These evidences show hints that eternal inflation is prohibited by quantum gravity.