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SUMMARY:Quantum Superpositions of Massive Bodies and Gravitationally Media
 ted Entanglement - Prof. Robert Wald\, the University of Chicago
DTSTART:20220309T141500Z
DTEND:20220309T151500Z
UID:TALK169997@talks.cam.ac.uk
CONTACT:Michalis Agathos
DESCRIPTION:It was previously shown in arXiv:1807.07015 that in order to a
 void contradictions with complementarity and causality in a gedankenexperi
 ment involving a quantum superposition of a massive body\, it is necessary
  to for there to be both quantized gravitational radiation and local vacuu
 m fluctuations of the spacetime metric  We review this gedankenexperiment 
 and the previously given "back of the envelope" arguments that resolve it.
  We then improve upon this analysis by providing a precise and rigorous de
 scription of the entanglement and decoherence effects\, as given in arXiv:
 2112.10798. As a by-product of our analysis\, we show that under the proto
 cols of the gedankenexperiment\, there is no clear distinction between ent
 anglement mediated by the Newtonian gravitational field of a body and enta
 nglement mediated by on-shell gravitons emitted by the body. This suggests
  that Newtonian entanglement implies the existence of graviton entanglemen
 t and supports the view that the experimental discovery of Newtonian entan
 glement may be viewed as implying the existence of the graviton.
LOCATION:Online (zoom details to be sent by email)
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