QISS HKU 2020 - Jonathan Oppenheim - A post-quantum theory of classical gravity?

Talk SLIDES: https://archive.org/details/tulio-QISS-HKU

Talk Title: A post-quantum theory of classical gravity?

Talk Abstract:
Can we have a consistent theory of classical systems coupled to quantum ones? Would I be giving this talk if it wasn't the case? We construct a theory of classical gravity coupled to quantum field theory. The theory doesn't suffer the pathologies of semi-classical gravity and reduces to Einstein's equations in the appropriate limit. The assumption that gravity is classical necessarily modifies the dynamical laws of quantum mechanics -- the theory must be fundamentally information destroying involving finite sized and stochastic jumps in space-time and in the quantum field. The measurement postulate of quantum mechanics is not needed since the interaction of the quantum degrees of freedom with classical space-time necessarily causes collapse of the wave-function. The theory can be regarded as fundamental, or as an effective theory of the backreaction of quantum fields on space-time. We discuss why several well-known no-go results on both local information destruction and leaving gravity unquantised don't apply.
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The QISS Hong Kong workshop was co-organised by:

The Quantum Information and Computation Initiative of The University of Hong Kong, dpt of Computer Science. https://qift.weebly.com

The Quantum Group of The University of Oxford, dpt of Computer Science. http://www.cs.ox.ac.uk/activities/quantum/

The Samy Maroun Center for Space, Time and the Quantum.
http://www.spacetimeandquantum.com

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About QISS

The Quantum Information Structure of Spacetime (http://www.qiss.fr) is an interdisciplinary research initiative among several universities and research institutes all over the world, supported by the John Templeton Foundation through the following grant:

https://www.templeton.org/grant/the-quantum-information-structure-of-spacetime-qiss

The goal of QISS is to explore and connect the research domains of Quantum Information/Computing, Quantum Gravity and Quantum Foundations. Main objectives are to found the physics of quantum spacetime on an information-theoretic basis, to bring within reach empirical access to quantum gravity in 'table-top' laboratory conditions by exploiting rapid advances in quantum computing related technologies and using quantum information theoretic concepts, and to promote an extensive interaction between physicists and philosophers on the conceptual role of information in spacetime physics.

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