Topic summary
Spacelike
Extracted from the Wikipedia article Causal structure.
Curves
- chronological (or timelike) if the tangent vector is timelike at all points in the curve. Also called a world line.
- null if the tangent vector is null at all points in the curve.
- spacelike if the tangent vector is spacelike at all points in the curve.
- causal (or non-spacelike) if the tangent vector is timelike or null at all points in the curve.