Foundations of Physics

, Volume 25, Issue 1, pp 123–137 | Cite as

More ado about nothing

  • Michael Redhead
Invited Papers Dedicated to Jean-Pierre Vigier


In this paper questions about vacuum fluctuations in local measurements, and the correlations between such fluctuations, are discussed. It is shown that maximal correlations always exist between suitably chosen local projection operators associated with spacelike separated regions of space-time, however far apart these regions may be. The connection of this result with the well-known Fregenhagen bound showing exponential decay of correlations with distance is explained, and the relevance of the discussion to the question “What do particle detectors detect?” is addressed.


Exponential Decay Projection Operator Local Measurement Separate Region Maximal Correlation 
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Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • Michael Redhead
    • 1
  1. 1.Wolfson CollegeCambridgeUK

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