10,765 research outputs found
Anne Bogart, and then, you act : making art in an unpredictable world
Review of Anne Bogart's 2007 'And then, you act: making art in an unpredictable world
The Logic of Quantum Mechanics Derived from Classical General Relativity
For the first time it is shown that the logic of quantum mechanics can be
derived from Classical Physics. An orthomodular lattice of propositions,
characteristic of quantum logic, is constructed for manifolds in Einstein's
theory of general relativity. A particle is modelled by a topologically
non-trivial 4-manifold with closed timelike curves - a 4-geon, rather than as
an evolving 3-manifold. It is then possible for both the state preparation and
measurement apparatus to constrain the results of experiments. It is shown that
propositions about the results of measurements can satisfy a non-distributive
logic rather than the Boolean logic of classical systems. Reasonable
assumptions about the role of the measurement apparatus leads to an
orthomodular lattice of propositions characteristic of quantum logic.Comment: 16 pages Late
Charge and the topology of spacetime
A new class of electrically charged wormholes is described in which the outer 2-sphere is not spanned by a compact, co-orientable hypersurface, These wormholes can therefore display net electric charge from the source-free Maxwell equations. This extends the work of Sorkin on non-space-orientable manifolds, to spacetimes which do not admit a time orientation. The work is motivated by the suggestion that quantum theory can be explained by modelling elementary particles as regions of spacetime with non-trivial causal structure. The simplest example of an electrically charged spacetime carries a spherical symmetry
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