Abstract
A definition of a causal boundary\(\dot V\) is given by assigning a future and a past endpoint to any non-extensible timelike or null line. A topology and a partial ordering can be introduced on\(\bar V: = \dot V \cup V\). The usual conditions for the causal structure can be formulated as properties of\(\dot V\). This boundary is compared with other types of boundaries.
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Read on 15 May 1970 at the Gwatt Seminar on the Bearings of Topology upon General Relativity
Work supported by the Deutsche Forschungsgemeinschaft.
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Seifert, H.J. The causal boundary of space-times. Gen Relat Gravit 1, 247–259 (1971). https://doi.org/10.1007/BF00759536
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DOI: https://doi.org/10.1007/BF00759536