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Stefan Leichenauer

Title: Quantum Mechanics With Horizons

Abstract: One of the major outstanding puzzles in modern physics is how to make sense of horizons in quantum

mechanics. A horizon in classical physics means that there are observers in different spacetime regions who

never get to talk to each other, even in principle, or who can only communicate for a finite amount of time before

going their separate ways. The most naive attempts to introduce quantum mechanics to these scenarios lead to

some unpalatable results, e.g., the black hole information paradox and associated topics. I want to give a general

overview of the subject, with special focus on black hole horizons and de Sitter horizons and problems they each

present to us. I suspect that progress can be made by properly understanding the emergence of classicality in

spacetimes with horizons. It's difficult to give a good reference for these ideas, since they are speculative and

each person has their own opinion on how it will all turn out when the dust is settled. Some interesting and recent

places to start [are below].

[Slides (PDF)] [Video (YouTube)]


L. Susskind, Black Hole Complementarity and the Harlow-Hayden Conjecture (arXiv:1301.4505).

R. Bousso, L. Susskind, The Multiverse Interpretation of Quantum Mechanics (arXiv:1105.3796).

He says the future dS horizon has no Hawking radiation. I think he is mistaken because advanced Wheeler-Feynman radiation from it back to us from the future in the Aharonov destiny effect has the same energy density as the observed anti-gravitating dark energy accelerating the expansion of our universe. With anti-Feynman boundary conditions on the propagator this is exotic negative energy propagating forward in time that, according to Einstein's general relativity, gives the anti-gravity field. This anti-gravity field if amplified in the lab can power starship warp drives an make stargate time machine traversable wormholes. Indeed, that may explain the UFO enigma.