Quantum cosmology and eternal inflation

TL;DR

This paper reviews quantum cosmology, especially tunneling approaches, and explores its relationship with eternal inflation, questioning the necessity and testability of quantum cosmology in the context of eternal inflation.

Contribution

It provides a comparative review of quantum cosmology approaches and analyzes their relevance and testability concerning eternal inflation.

Findings

Tunneling approach is a key method in quantum cosmology.

Quantum cosmology's predictions may not be testable in eternal inflation scenarios.

The necessity of quantum cosmology is questioned in light of eternal inflation.

Abstract

This contribution consists of two parts. In the first part, I review the tunneling approach to quantum cosmology and comment on the alternative approaches. In the second part, I discuss the relation between quantum cosmology and eternal inflation. In particular, I discuss whether or not we need quantum cosmology in the light of eternal inflation, and whether or not quantum cosmology makes any testable predictions.