@article{Weinberg2012CollapseOT,
title={Collapse of the State Vector},
author={S. Weinberg},
journal={Physical Review A},
year={2012},
volume={85},
pages={062116}
}

Modifications of quantum mechanics are considered, in which the state vector of any system, large or small, undergoes a stochastic evolution. The general class of theories is described, in which the probability distribution of the state vector collapses to a sum of delta functions, one for each possible final state, with coefficients given by the Born rule.

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Rev . Mod . Phys . Speakable and Unspeakable in Quantum Mechanics

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Phys

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The possibility of instantaneous communication between separated systems is discussed in a wider context by J