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SUMMARY:Guilherme Franzmann (Stockholm University)
DTSTART:20241001T070000Z
DTEND:20241001T090000Z
DTSTAMP:20260417T072617Z
UID:3cqfs/27
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/3cqfs/27/">A
 re quantum subsystems invariant?</a>\nby Guilherme Franzmann (Stockholm Un
 iversity) as part of Tricontinental Quantum Fundamentals Seminar\n\n\nAbst
 ract\nWhat is a physical subsystem? How classical physical subsystems loca
 lized in spacetime (causally independent) are identified from quantum ones
 ? Traditionally\, classical systems have been uniquely identified with qua
 ntum systems\, typically represented as factors in Hilbert space for finit
 e-dimensional systems or associated with a local (microcausality) algebra 
 of operators in QFT. Both representations aim to instantiate a specific pr
 escription of subsystems' independence\, that they must be statistically i
 ndependent for state preparations and measurements. Despite this prescript
 ion\, it is easy to show that canonical linearized quantum gravity prevent
 s us from obtaining a gauge-invariant local algebra\, thus undermining one
  of the conditions needed for statistical independence of subsystems in QF
 T. Arguably\, this precludes most of the modeling associated with early un
 iverse cosmology as well as current attempts to model gravity-induced-enta
 nglement table-top experiments. Nonetheless\, primarily it presents a majo
 r roadblock towards a theory of quantum gravity. In this talk\, after revi
 ewing the aforementioned points\, I will propose that a way forward is tha
 t the unique identification between quantum and classical systems should b
 e dropped\, and instead this mapping should be dynamical\, which opens the
  possibility for a single-world unitary quantum mechanics.\n
LOCATION:https://researchseminars.org/talk/3cqfs/27/
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