Communications in Mathematical Physics

, Volume 134, Issue 1, pp 29–63 | Cite as

Local quasiequivalence and adiabatic vacuum states

  • Christian Lüders
  • John E. Roberts


The problem of determining the physically relevant states acquires a new dimension in curved spacetime where there is, in general, no natural definition of a vacuum state. It is argued that there is a unique local quasiequivalence class of physically relevant states and it is shown how this class can be specified for the free Klein-Gordon field on a Robertson-Walker spacetime by using the concept of an adiabatic vacuum state. Any two adiabatic vacuum states of order two are locally quasiequivalent.


Neural Network Statistical Physic Complex System Nonlinear Dynamics Vacuum State 
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Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • Christian Lüders
    • 1
  • John E. Roberts
    • 1
  1. 1.Fachbereich PhysikUniversität OsnabrückOsnabrückGermany

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