On the wavefunction collapse

TL;DR

This paper explores the possibility that wavefunction collapse is a continuous, unitary process during measurement, aiming to reconcile quantum mechanics with relativity through a time-symmetric approach.

Contribution

It proposes a time-symmetric reformulation of quantum measurement, challenging the traditional view of collapse as discontinuous and nonlocal, and discusses its potential to unify quantum mechanics with relativity.

Findings

Identifies major difficulties with continuous collapse models

Argues that such models can be locally realistic without contradicting Bell's theorem

Suggests a possible reconciliation of quantum mechanics with General Relativity

Abstract

Wavefunction collapse is usually seen as a discontinuous violation of the unitary evolution of a quantum system, caused by the observation. Moreover, the collapse appears to be nonlocal in a sense which seems at odds with General Relativity. In this article the possibility that the wavefunction evolves continuously and hopefully unitarily during the measurement process is analyzed. It is argued that such a solution has to be formulated using a time symmetric replacement of the initial value problem in Quantum Mechanics. Major difficulties in apparent conflict with unitary evolution are identified, but eventually its possibility is not completely ruled out. This interpretation is in a weakened sense both local and realistic, without contradicting Bell's theorem. Moreover, if it is true, it makes Quantum Mechanics consistent with General Relativity in the semiclassical framework.