Local quasiequivalence and adiabatic vacuum states

Details Local quasiequivalence and adiabatic vacuum states Local quasiequivalence and adiabatic vacuum states

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990cmaph.134...29l&link_type=abstract

Communications in Mathematical Physics, Volume 134, Issue 1, pp.29-63

Mathematics

Mathematical Physics

27

Scientific paper

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.

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