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SUMMARY:Repulsive Gravitational Force as a Witness of the Quantum Nature o
 f Gravity
DTSTART:20261013T080000Z
DTEND:20261013T090000Z
DTSTAMP:20261012T170400Z
UID:indico-event-9869@indico.fysik.su.se
DESCRIPTION:Speakers: Navdeep Arya (Stockholm University)\n\nPablo L. Sald
 anha\, Chiara Marletto\, Vlatko Vedral\nhttps://arxiv.org/abs/2602.12266\n
 We show that a single spatially superposed 'source' mass acting on a 'prob
 e' matter wavepacket can reveal the quantum nature of the gravitational fi
 eld. For this we use a specific state preparation and measurement of the s
 uperposed source mass\, including a postselection\, which altogether resul
 ts in a repulsive gravitational force on the probe particle. A classical g
 ravitational field can never lead to repulsion\, as the effect requires qu
 antum interference of two distinct states of gravity. The eventual observa
 tion of such an effect would be a violation of Einstein's theory of genera
 l relativity\, where gravity is always attractive. We also present a calcu
 lation in the Heisenberg picture under the formalism of weak values that i
 llustrates how repulsion is achieved. Finally\, we estimate the range of p
 arameters (masses and the spatio-temporal extent of interference) for whic
 h the experiment is feasible.\n\nhttps://indico.fysik.su.se/event/9869/
LOCATION:AlbaNova A5:1041 - CoPS grupprum (AlbaNova Main Building)
URL:https://indico.fysik.su.se/event/9869/
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