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SUMMARY:Locality\, non-locality and relativized observables in QFT - Profe
 ssor Kasia Rejzner (University of York)
DTSTART:20251201T140000Z
DTEND:20251201T153000Z
UID:TALK241492@talks.cam.ac.uk
CONTACT:Adrian Kent
DESCRIPTION:Algebraic quantum fields theory (AQFT) is a mathematical frame
 work for studying foundations of QFT where a model is specified in terms o
 f a net of local algebras. The word "locality" has several meanings in thi
 s context\, including the fact that one assigns these algebras to bounded 
 regions\, and that operators localized in spacelike separated regions comm
 ute. The need for more general localization arises already in quantum elec
 trodynamics (QED)\, e.g. in the case of a Dirac string. More generally\, I
  will argue that the natural class of non-local observables arises as rela
 tivised observables in the presence of a quantum reference frames (QRF). S
 uch observables describe relations between a local net and a QRF and these
  are the quantities that we actually measure.
LOCATION:MR3\,  Centre for Mathematical Sciences\, Wilberforce Road\, Camb
 ridge
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