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    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeJan 4th 2018

    at S-matrix and elsewhere is reference to the “causal order“-relation, the relation saying that for a pair (S 1,S 2)(S_1,S_2) of subsets of a spacetime, S 1S_1 does not intersect the past of S 2S_2, or equivalently that S 2S_2 does not intersect the future of S 1S_1.

    (Following a suggestion by Arnold Neumaier, a neat suggestive notation for this is S 1S 2S_1 {\vee\!\!\!\wedge} S_2, which I have been implementing now at S-matrix.)

    I am starting to give this concept its own entry, currently titled “causal order”; but what’s good terminology?

    This relation {\vee\!\!\!\wedge} is not really an ordering, since it is not transitive. It would seem tempting to say “causal relation”, but googling for this term shows that has an different established meaning.