Evolution in Quantum Causal Histories

Details Evolution in Quantum Causal Histories Evolution in Quantum Causal Histories

2003-02-14

arxiv.org/abs/hep-th/0302111v3

Class.Quant.Grav. 20 (2003) 3839

Physics

High Energy Physics

High Energy Physics - Theory

20 pages. 8 figures. (v3: minor corrections, additional references [2,3]) to appear in CQG

Scientific paper

10.1088/0264-9381/20/16/320

We provide a precise definition and analysis of quantum causal histories (QCH). A QCH consists of a discrete, locally finite, causal pre-spacetime with matrix algebras encoding the quantum structure at each event. The evolution of quantum states and observables is described by completely positive maps between the algebras at causally related events. We show that this local description of evolution is sufficient and that unitary evolution can be recovered wherever it should actually be expected. This formalism may describe a quantum cosmology without an assumption of global hyperbolicity; it is thus more general than the Wheeler-DeWitt approach. The structure of a QCH is also closely related to quantum information theory and algebraic quantum field theory on a causal set.

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