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dc.contributor.authorDowker, H.F.-
dc.contributor.authorGarcia, R.S.-
dc.contributor.authorSurya, Sumati-
dc.date.accessioned2012-05-29T10:37:11Z-
dc.date.available2012-05-29T10:37:11Z-
dc.date.issued2000-11-
dc.identifier.citationClassical and Quantum Gravity, 2000, Vol.17, Issue 21, p 4377-4396en
dc.identifier.issn0264-9381-
dc.identifier.issn1361-6382 (online)-
dc.identifier.urihttp://hdl.handle.net/2289/4551-
dc.descriptionRestricted Access. An open-access version is available at arXiv.org (one of the alternative locations)en
dc.description.abstractThe causal relation K+ was introduced by Sorkin and Woolgar to extend the standard causal analysis of C2 spacetimes to those that are only C0. Most of their results also hold true in the case of metrics with degeneracies which are C0 but vanish at isolated points. In this paper we seek to examine K+ explicitly in the case of topology-changing `Morse histories' which contain degeneracies. We first demonstrate some interesting features of this relation in globally Lorentzian spacetimes. In particular, we show that K+ is robust and the Hawking and Sachs characterization of causal continuity translates into a natural condition in terms of K+. We then examine K+ in topology-changing Morse spacetimes with the degenerate points excised and then for the Morse histories in which the degenerate points are reinstated. We find further characterizations of causal continuity in these cases.en
dc.language.isoenen
dc.publisherInstitute of Physicsen
dc.relation.urihttp://arxiv.org/abs/gr-qc/9912090en
dc.relation.urihttp://dx.doi.org/ 10.1088/0264-9381/17/21/303en
dc.relation.urihttp://adsabs.harvard.edu/abs/2000CQGra..17.4377Den
dc.rights2000, Institute of Physicsen
dc.titleK-causality and degenerate spacetimesen
dc.typeArticleen
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