Rigorous construction of Markovian hybrid quantum-classical dynamics via coupled SDEs and hybrid semigroups, reducing to known cases and including examples with hidden entanglement.
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Decoherence with a hidden environment in fully quantum systems produces effective non-Markovian classical-quantum dynamics, valid when the semi-Wigner operator remains positive semidefinite, reducing to Markovian CQ models in the short-memory limit.
Postquantum classical gravity requires stochastic spacetime fluctuations consisting of a diffusing spin-2 field and spin-0 scalar whose noise is constrained by LISA Pathfinder and decoherence bounds.