Journal
PHYSICS LETTERS B
Volume 792, Issue -, Pages 64-68Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2019.03.015
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We analyse the recent proposal of measuring a quantum gravity phenomenon in the lab by entangling two mesoscopic particles gravitationally. We give a generally covariant description of this phenomenon, where the relevant effect turns out to be a quantum superposition of proper times. We point out that if General Relativity is assumed to hold for masses at this scale, measurement of this effect would count as evidence for quantum superposition of spacetime geometries. This interpretation addresses objections appeared in the literature. We observe that the effect sheds light on the Planck mass, and argue that it is very plausibly a real effect. (C) 2019 The Author(s). Published by Elsevier B.V.
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