# Non-locality and quasiclassical reality in Kent's formulation of relativistic quantum theory

## TL;DR

This paper discusses Adrian Kent's Lorentz-invariant quantum framework that uses a final boundary condition to define a realist, one-world interpretation, exploring its implications for locality and the emergence of classical history.

## Contribution

It analyzes Kent's formulation's stance on locality conditions and proposes a modification to facilitate classical history emergence under certain conditions.

## Key findings

- Kent's framework is compatible with Lorentz invariance.
- The formulation offers a realist interpretation of quantum events.
- A proposed amendment helps classical history emerge in shielded or delayed scenarios.

## Abstract

We report Adrian Kent's proposed framework for a realist, one-world, Lorentz-invariant formulation of quantum theory. The idea is to postulate a final boundary condition: in effect, a late-time distribution of mass-energy recording how photons scattered off macroscopic objects. Nature selects this final boundary condition with the orthodox late-time Born probability; and this defines the probability space of events, to give a realist quantum theory. We emphasize two topics. First, we consider this formulation's verdicts about traditional locality conditions, such as Outcome Independence and Parameter Independence. Second, we discuss a possible amendment to Kent's proposal that, roughly speaking, allows for the emergence of a quasiclassical history even when mass-energy is shielded or delayed from appearing in the final boundary condition.