English Explanatory Dictionary

null infinity

English dictionary entry

Meanings

noun
  1. 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.

Word forms

null infinity null infinities

Etymology

From the physics concept of "at infinity" or "far", where fields are small, and the math concept of null set. Ironically, a null infinity may be neither far nor a null set.

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