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Sep 14, 2020 at 20:24 vote accept Mirco A. Mannucci
May 2, 2016 at 12:54 answer added Carlo Beenakker timeline score: 3
May 2, 2016 at 9:25 comment added Mirco A. Mannucci Thanks Chris! Very very valuable refs.....Yes Igor, good points.
May 2, 2016 at 6:34 comment added Chris Gerig A dynamical time operator in Dirac’s relativistic quantum mechanics arxiv.org/pdf/0908.2789v3.pdf and Time in Quantum Mechanics and Quantum Field Theory arxiv.org/pdf/quant-ph/0211047.pdf (both describe the operator for relativisitic QM).
May 2, 2016 at 2:40 comment added Igor Khavkine Thinking of the Dirac equation in relativistic QM as a complete analog of the Schroedinger equation in non-relativistic QM is overly simplistic. In any physically reasonable way, the Hamiltonian of a single Dirac particle or of the Dirac quantum field is positive definite. This means that you would encounter the same issues with the time operator as in non-relativistic QM. For what it's worth, the tachionic ($m^2 < 0$) Klein-Gordon field does have energy unbounded from both above and below.
May 1, 2016 at 21:21 comment added Mirco A. Mannucci ok thanks Qiaochu. Let me keep it here a little longer, one never knows. But I think you are probably right, this is a physics question (although there is an operator algebra side of it in my addendum: even if the answer turns out to be physically nil, would be nice to know if there is a math toy model along these lines....)
May 1, 2016 at 21:12 comment added Qiaochu Yuan Probably going to get better answers on physics.stackexchange.com.
May 1, 2016 at 20:35 history asked Mirco A. Mannucci CC BY-SA 3.0