Causal boundaries for general relativistic space-times

Abstract
Let M be a causally continuous space‐time. Using indecomposable past and future sets in a symmetric way we construct a causal completion N for M. N is a causal space; the chronology of M in N is the chronology of M. The extended Alexandrov topology for N makes N Hausdorff and M a densely imbedded subspace. M is globally hyperbolic iff either the chronological future or the chronological past of each point in N‐M is empty, causally simple iff the causality of M in N is the causality of M. The standard examples of causal completions are special cases.

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