We develop a theory based on Bohmian mechanics in which particle world lines can begin and end. Such a theory provides a realist description of creation and annihilation events and thus a further step towards a "beable-based" formulation of quantum eld theory, as opposed to the usual "observable-based" formulation which is plagued by the conceptual diculties|like the measurement problem|of quantum mechanics.
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rr et al. (2003) studied this question.
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