Space-Time Topology (II)—Causality, the Fourth Stiefel–Whitney Class and Space-Time as a Boundary |
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| Authors: | Malene Steen Nielsen Flagga Frank Antonsen |
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| Institution: | (1) DK-2300 Copenhagen S, Denmark;(2) Theoretical Physics Department, University of Groningen, Nijenborgh 4, NL-9747 AG Gronigen, The Netherlands |
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| Abstract: | We show that stable causality is related to the vanishing of the top Stiefel–Whitney class of a space-time manifold M, and that if M is a stably causal space-time manifold, then it is the boundary of a five-dimensional space-time. We then propose a scheme for making it both a necessary and sufficient condition. |
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| Keywords: | fourth Stiefel– Whitney class causality space-time as boundary |
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