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Traditional interpretations of quantum theory in terms of wave functioncollapse are particularly unappealing when considering the universe as a whole,where there is no clean separation between classical observer and quantumsystem and where the description is inherently relativistic. As an alternative,the consistent histories approach provides an attractive "no collapse"interpretation of quantum physics. Consistent histories can also be linked topath-integral formulations that may be readily generalized to the relativisticcase. A previous paper described how, in such a relativistic spacetime pathformalism, the quantum history of the universe could be considered to be aneignestate of the measurements made within it. However, two important topicswere not addressed in detail there: a model of measurement processes in thecontext of quantum histories in spacetime and a justification for why theprobabilities for each possible cosmological eigenstate should follow Born'srule. The present paper addresses these topics by showing how Zurek's conceptsof einselection and envariance can be applied in the context of relativisticspacetime and quantum histories. The result is a model of systems andsubsystems within the universe and their interaction with each other and theirenvironment.

Consistent histories of systems and measurements in spacetime