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SUMMARY:Rainer Verch (University of Leipzig)
DTSTART:20250513T150000Z
DTEND:20250513T160000Z
DTSTAMP:20260417T072402Z
UID:3cqfs/40
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/3cqfs/40/">C
 ausality violations in quantum field theory? A ping-pong ball test</a>\nby
  Rainer Verch (University of Leipzig) as part of Tricontinental Quantum Fu
 ndamentals Seminar\n\n\nAbstract\nIt has been pointed out that there are l
 ocal operations in quantum field theory which can lead to superluminal eff
 ects. A prominent example is the "impossible measurements scenario" put fo
 rward by Sorkin. In this presentation\, it will be explained that such app
 arent difficulties are not a specific defect or pathology of quantum field
  theory\, but that they also occur in classical relativistic field theory.
  On the other hand\, if the operations are required to be mediated by loca
 l interactions\, then there are no superluminal effects. If time allows\, 
 it will also be explained that the time-travel analogue scenario in quantu
 m circuits proposed by Deutsch (D-CTC) is\, on one hand\, not related to c
 losed timelike curves in the sense of general relativity\, and on the othe
 r hand\, can be realized also in classical statistical theories and is the
 refore not based on quantum mechanics.\n
LOCATION:https://researchseminars.org/talk/3cqfs/40/
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