causal boundary

causal boundary

[¦kȯz·əl ′bau̇n·drē]
(relativity)
A boundary attached to a space-time that depends only on the causal structure; it does not distinguish between boundary points at finite distances (singularities) or those at infinity. Also known as C boundary.
References in periodicals archive ?
They also introduce the new Busemann compactification, relating it to the previous two completions, and give a full description of the causal boundary of any standard conformally stationary spacetime.