Quantum Cosmology and the Arrow of Time

TL;DR

This paper explores how quantum cosmology can explain the origin of the arrow of time, linking fundamental laws, cosmological boundary conditions, and black hole implications.

Contribution

It introduces a simple boundary condition in quantum cosmology that accounts for the observed arrows of time and discusses its consequences for black holes.

Findings

Boundary condition leads to observed time asymmetry

Implications for black hole physics

Reconciliation of time-reversal invariance with experience

Abstract

Although most fundamental laws are invariant under time reversal, experience exhibits the presence of irreversible phenomena -- the arrows of time. Their origin lies in cosmology, and I argue that only quantum cosmology can provide the appropriate formal framework. After briefly reviewing the formalism, I discuss how a simple and natural boundary condition can lead to the observed arrows of time. This yields at the same time interesting consequences for black holes.