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SUMMARY:Local measurement schemes for quantum field theory in curved space
 times - Chris Fewster\, York
DTSTART:20181031T141500Z
DTEND:20181031T151500Z
UID:TALK111505@talks.cam.ac.uk
CONTACT:Francesca Chadha-Day
DESCRIPTION:Consider an experiment in which a probe is coupled to a quantu
 m field in a bounded spacetime region\, and the probe is subsequently meas
 ured. \nAn obvious question is how the measurement of the probe can be int
 erpreted as an observation of the quantum field\, but\, surprisingly\, rat
 her little work has been done to address it. In quantum mechanics there is
  a well-developed field of quantum measurement theory\, but this is rarely
  discussed in the context of quantum fields and still less in curved space
 times. This talk will describe how the probe measurement can be interprete
 d as an observable with a defined localisation\, and will discuss a number
  of related issues\, including how a post-selected state can be defined fo
 llowing a selective measurement of the probe. The general formalism is ill
 ustrated with a specific model. (Joint work with Rainer Verch [Leipzig] - 
 arXiv:1810.06512). 
LOCATION:MR2\, Centre for Mathematical Sciences
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