The coevent formulation of quantum theory

TL;DR

The coevents formulation offers a histories-based, realist interpretation of quantum theory that resolves paradoxes, maintains non-Boolean logic, and aligns with quantum predictions, making it promising for quantum gravity and cosmology.

Contribution

It introduces a novel histories-based ontological framework for quantum theory that avoids paradoxes and supports classicality emergence.

Findings

Resolves quantum paradoxes using coarse-grained histories

Maintains non-Boolean, non-contextual logic

Recovers standard quantum probabilities with Cournot's principle

Abstract

Understanding quantum theory has been a subject of debate from its birth. Many different formulations and interpretations have been proposed. Here we examine a recent novel formulation, namely the coevents formulation. It is a histories formulation and has as starting point the Feynman path integral and the decoherence functional. The new ontology turns out to be that of a coarse-grained history. We start with a quantum measure defined on the space of histories, and the existence of zero covers rules out single-history as potential reality (the Kochen Specker theorem casted in histories form is a special case of a zero cover). We see that allowing coarse-grained histories as potential realities avoids the previous paradoxes, maintains deductive non-contextual logic (alas non-Boolean) and gives rise to a unique classical domain. Moreover, we can recover the probabilistic predictions of quantum theory with the use of the Cournot's principle. This formulation, being both a realist formulation and based on histories, is well suited conceptually for the purposes of quantum gravity and cosmology.