Mark J. Hadley

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It is shown that models of elementary particles in classical general relativity will naturally have the transformation properties of a spinor if the spacetime manifold is not time orientable. From a purely pragmatic interpretation of quantum theory this explains why spinors are needed to represent particles. The models are based entirely on classical(More)
Contrary to established beliefs, spacetime may not be time-orientable. By considering an experimental test of time orientability it is shown that a failure of time-orientability of a spacetime region would be indistinguishable from a particle antiparticle annihilation event. Submitted to: Class. Quantum Grav. The orientability of spacetime 2
A new class of electrically charged wormholes is described in which the outer two sphere is not spanned by a compact coorientable hypersurface. These wormholes can therefore display net electric charge from the source free Maxwell’s equation. This extends the work of Sorkin on non-space orientable manifolds, to spacetimes which do not admit a time(More)
The effectiveness of probabilistic structural testing depends on the characteristics of the probability distribution from which test inputs are sampled at random. Metaheuristic search has been shown to be a practical method of optimising the characteristics of such distributions. However, the applicability of the existing search-based algorithm is limited(More)
It is shown that certain structures in classical General Relativity can give rise to non-classical logic, normally associated with Quantum Mechanics. A 4-geon model of an elementary particle is proposed which is asymptotically flat, particle-like and has a non-trivial causal structure. The usual Cauchy data are no longer sufficient to determine a unique(More)
Classical particle-like solutions of field equations such as general relativity, could account for dark matter. Such particles would not interact quantum mechanically and would have negligible interactions apart from gravitation. As a relic from the big bang, they would be a candidate for cold dark matter consistent with observations. PACS numbers:(More)
Wormholes, Time machines and Energy conditions: would Einstein have come to this parallel session? If it was held in 1950, I don’t think so. Einstein had a strong belief in preserving causality as a fundamental principle that contributed to his work on relativity. But if Einstein was at MG11 in 2006, this is where Einstein would be. Einstein would be(More)
A scientific approach to Free Will is described. A model is constructed that exhibits the essential observable properties commonly called Free Will. The model is a deterministic algorithm. The key element is an algorithm that recognizes an attempt to predict responses and has a tendency to resist such challenges. We have created a computer with Free Will.(More)
The practice of setting quantum fields as sources for classical general relativity is examined. Several conceptual problems are identified which invalidate apparently innocuous equations. Alternative ways to links classical general relativity with quantum theory using Bohm’s theory are proposed. PACS numbers: 12.90.+b, 03.65.Ta, 04.20.Cv Submitted to:(More)