null infinity
（ plural ）
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In a closed space-time, especially for an Einstein cylinder, null infinity for a given point is the limit of convergence of the light cone most distant from the given point. That is, it is the limit of a set of points that each have a time-like separation from every point that has a space-like separation from the given point.
null infinity
When studying the causal structure of the Einstein cylinder, researchers frequently analyze how the light cones for a given event converge toward null infinity to determine which regions are forever causally separated.
When studying the causal structure of the Einstein cylinder, researchers frequently analyze how the light cones for a given event converge toward null infinity to determine which regions are forever causally separated.
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