BEGIN:VCALENDAR
VERSION:2.0
PRODID:researchseminars.org
CALSCALE:GREGORIAN
X-WR-CALNAME:researchseminars.org
BEGIN:VEVENT
SUMMARY:Antoine Soulas (Choups) (University of Vienna)
DTSTART:20260505T070000Z
DTEND:20260505T083000Z
DTSTAMP:20260417T072349Z
UID:3cqfs/42
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/3cqfs/42/">A
  proof that no-signalling implies microcausality in quantum field theory</
 a>\nby Antoine Soulas (Choups) (University of Vienna) as part of Tricontin
 ental Quantum Fundamentals Seminar\n\n\nAbstract\nMicrocausality counts am
 ong the basic requirements that ensure the consistency of quantum field th
 eories (QFT). In the literature on the foundations of QFT\, however\, an e
 lementary derivation of microcausality from the relativistic constraints s
 eemed to be missing. Authors generally proceed the other way round\, justi
 fying the axiom as a sufficient condition to guarantee some desired proper
 ties\, typically involving properties like no-signalling\, separability\, 
 independence of operations\, tensor product structure... The aim of this w
 ork [1] is to study some logical interrelationships between fundamental pr
 operties in (relativistic) quantum theories\, and in particular to provide
  an elementary but important proof concerning microcausality that was appa
 rently missing in the literature.\n\nTo do so\, an operational no-signalli
 ng condition is first introduced in the context of quantum mechanics\, whe
 re we prove its equivalence to an apparently weaker version (CPTP version 
 equivalent to PVM version)\, and to a property of factorisation of the evo
 lution unitary operator\, generalising some results of [2]. We then transl
 ate this condition in QFT and prove that it implies both microcausality an
 d the spin-statistics theorem\, in the ideal case of pointwise measurement
 s implemented in the projection postulate sense. This provides an argument
  (often invoked but apparently missing in the literature) to see microcaus
 ality as a necessary condition for the compatibility of spacelike separate
 d operations.\n\n[1] Soulas\, Antoine. <a href=https://doi.org/10.1007/s10
 701-025-00832-7>"A proof that no-signalling implies microcausality in quan
 tum field theory."</a> Foundations of Physics 55.2 (2025): 22.\n\n[2] Beck
 man\, David\, et al. <a href=https://doi.org/10.1103/PhysRevA.64.052309>"C
 ausal and localizable quantum operations."</a> Physical Review A 64.5 (200
 1): 052309.\n
LOCATION:https://researchseminars.org/talk/3cqfs/42/
END:VEVENT
END:VCALENDAR