Jonathan Oppenheim

Oct 28, 2024 | superposer.substack.com | Jonathan Oppenheim

The debate about whether gravity is a force since it has just flared up yet again so I thought now would be a good time to give Substack a start, and wade in. The debate is partly semantics, and sometime a bit of physics-trolling but it’s weirdly heated, I think because it hinges on differing attitudes to geometry and field theory.

Jul 3, 2024 | link.aps.org | Jonathan Oppenheim |Gower Street |Andrea L. Russo

When classical degrees of freedom and quantum degrees of freedom are consistently coupled, the former diffuse, while the latter undergo decoherence. Here, we construct a theory of quantum matter fields and Nordström gravity in which the space-time metric is treated classically. The dynamics is constructed via the classical-quantum path integral and is completely positive, trace preserving (CPTP) and respects the classical-quantum split.

Feb 27, 2024 | arxiv.org | Jonathan Oppenheim |Andrea L. Russo |Muhammad T. Sajjad

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Dec 3, 2023 | link.aps.org | Jonathan Oppenheim |Gower Street

ViewpointMight There Be No Quantum Gravity After All? Published 4 December 2023A proposed model unites quantum theory with classical gravity by assuming that states evolve in a probabilistic way, like a game of chance. See more in PhysicsClick to ExpandPopular Summary The holy grail of physics—a quantum theory of gravity—has remained elusive for almost a century. Einstein’s theory of gravity, known as general relativity, posits that matter curves space-time.