Philip Pearle, Antony Valentini
Published 2005-06-14, updated 2005-10-14Version 2
We review realistic models that reproduce quantum theory in some limit and yield potentially new physics outside that limit. In particular, we consider deterministic hidden-variables theories (such as the pilot-wave model) and their extension to 'quantum nonequilibrium', and we consider the continuous spontaneous localization model of wave function collapse. Other models are briefly discussed.
Comments: 15 pages. Minor changes. To be published in: Encyclopaedia of Mathematical Physics, eds. J.-P. Francoise, G. Naber and T. S. Tsun (Elsevier, 2006)
Journal: 'Quantum mechanics: generalizations', in: "Encyclopaedia of Mathematical Physics", eds. J.-P. Fran\c{c}oise, G. Naber and T. S. Tsun (Elsevier, North-Holland, 2006), pp. 265--276
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