Time Symmetric Quantum Mechanics and Causal Classical Physics

TL;DR

This paper proposes a two-boundary quantum mechanics framework that lacks a traditional causal order, attributing macroscopic causality to cosmological asymmetries and transition rules, aiming for a heuristic understanding of macroscopic physics.

Contribution

It introduces a time-symmetric quantum mechanics model without fixed causal structure, offering a new perspective on the emergence of macroscopic causality from microscopic laws.

Findings

Causal structure arises from cosmological asymmetry.

Transition rules explain microscopic to macroscopic observations.

Framework suggests causality is not fundamental but emergent.

Abstract

A two boundary quantum mechanics without time ordered causal structure is advocated as consistent theory. The apparent causal structure of usual "near future" macroscopic phenomena is attributed to a cosmological asymmetry and to rules governing the transition between microscopic to macroscopic observations. Our interest is a heuristic understanding of the resulting macroscopic physics.