Blog
About

4
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      On Evolution Laws Taking Pure States to Mixed States in Quantum Field Theory

      Preprint

      ,

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          It has been argued that any evolution law taking pure states to mixed states in quantum field theory necessarily gives rise to violations of either causality or energy-momentum conservation, in such a way as to have unacceptable consequences for ordinary laboratory physics. We show here that this is not the case by giving a simple class of examples of Markovian evolution laws where rapid evolution from pure states to mixed states occurs for a wide class of states with appropriate properties at the ``Planck scale", suitable locality and causality properties hold for all states, and the deviations from ordinary dynamics (and, in particular, violations of energy-momentum conservation) are unobservably small for all states which one could expect to produce in a laboratory. In addition, we argue (via consideration of other, non-Markovian models) that conservation of energy and momentum for all states is not fundamentally incompatible with causality in dynamical models in which pure states evolve to mixed states.

          Related collections

          Author and article information

          Journal
          03 March 1995
          1995-05-23
          Article
          10.1103/PhysRevD.52.2176
          hep-th/9503024
          Custom metadata
          Phys.Rev. D52 (1995) 2176-2182
          19pages, RevTeX3, We have added a number of references and clarified the role of the Markovian approximation in the loss of energy conservation
          hep-th gr-qc

          Comments

          Comment on this article