  In order to address the measurement problem of quantum theory we make the
assumption that quantum state reduction should be regarded as a genuine
physical process deserving of a dynamical description. Generalizing the
nonrelativistic spontaneous localization models of Ghirardi, Rimini, Weber, and
Pearle, a relativistic state reduction mechanism is proposed. The mechanism
involves nonlinear stochastic modifications to the standard description of
unitary state evolution and the introduction of a mediating field to facilitate
smearing of quantum field interactions.
