Collapse of the State Vector

Abstract

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.

Version published in Phys. Rev. A. Discussion and references added regarding entanglement and instantaneous communication

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