arXiv subjects

C J S Clarke

Publications and source records attributed to C J S Clarke.

2 recordsLinked to original sources

arXiv1997

Generalised hyperbolicity in singular space-times

A new concept analogous to global hyperbolicity is introduced, based on test fields. It is shown that the space-times termed here ``curve integrable'' are globally hyperbolic in this new sense, and a plausibility argument is given suggesting that the result applies to shell crossing singularities. If the assumptions behind this last argument are valid, this provides an alternative route to the assertion that such singularities do not violate cosmic censorship.

gr-qc↗

arXiv1996

Generalised Functions and Distributional Curvature of Cosmic Strings

A new method is presented for assigning distributional curvature, in an invariant manner, to a space-time of low differentiability, using the techniques of Colombeau's `new generalised functions'. The method is applied to show that curvature of a cone is equivalent to a delta function. The same is true under small enough perturbations.

gr-qc↗