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9 papers · 2 filters
Dark Matter Gravitational Interactions
R. W. Tucker, C. Wang
We argue that the conjectured dark mater in the Universe may be endowed with a new kind of gravitational charge that couples to a short range gravitational interaction mediated by…
Einstein's Equations in the Presence of Signature Change
Tevian Dray
We discuss Einstein's field equations in the presence of signature change using variational methods, obtaining a generalization of the Lanczos equation relating the distributional…
Gravity and Signature Change
Tevian Dray, George Ellis, Charles Hellaby +1
The use of proper ``time'' to describe classical ``spacetimes'' which contain both Euclidean and Lorentzian regions permits the introduction of smooth (generalized) orthonormal fra…
Comment on `Smooth and Discontinuous Signature Type Change in General Relativity'
Tevian Dray, Charles Hellaby
Kossowski and Kriele derived boundary conditions on the metric at a surface of signature change. We point out that their derivation is based not only on certain smoothness assumpti…
Classical and Quantum Implications of the Causality Structure of Two-Dimensional Spacetimes with Degenerate Metrics
Jonathan Gratus, Robin W Tucker
The causality structure of two-dimensional manifolds with degenerate metrics is analysed in terms of global solutions of the massless wave equation. Certain novel features emerge.…
The Construction of Spinor Fields on Manifolds with Smooth Degenerate Metrics
J Schray, T Dray, C A Manogue +2
We examine some of the subtleties inherent in formulating a theory of spinors on a manifold with a smooth degenerate metric. We concentrate on the case where the metric is singular…