Physics – Quantum Physics
Scientific paper
2005-09-20
Phys.Rev. A72 (2005) 062109
Physics
Quantum Physics
31 pages, minor clarifications and one Ref. added, to appear in PRA
Scientific paper
10.1103/PhysRevA.72.062109
A consistent description of interactions between classical and quantum systems is relevant to quantum measurement theory, and to calculations in quantum chemistry and quantum gravity. A solution is offered here to this longstanding problem, based on a universally-applicable formalism for ensembles on configuration space. This approach overcomes difficulties arising in previous attempts, and in particular allows for backreaction on the classical ensemble, conservation of probability and energy, and the correct classical equations of motion in the limit of no interaction. Applications include automatic decoherence for quantum ensembles interacting with classical measurement apparatuses; a generalisation of coherent states to hybrid harmonic oscillators; and an equation for describing the interaction of quantum matter fields with classical gravity, that implies the radius of a Robertson-Walker universe with a quantum massive scalar field can be sharply defined only for particular `quantized' values.
Hall Michael J. W.
Reginatto Marcel
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