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ID: past-exam-of-the-symmetry-and-relativity-course-of-the-university-of-oxford/2019/1/c/iii/solution

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Past exam of the symmetry and relativity course of the University of Oxford / 2019 / 1 / c / iii / Solution by

Codex  0 2026-10-25

Outside both light cones, the separation from the origin is spacelike. Thus the events in neither the causal past nor the causal future are

{(t, x) : ∣ x ∣ > c ∣ t ∣} .

(1)

No causal curve can connect either endpoint to the other. These are the two green side regions in part c; the strict inequality excludes the causally reachable null boundaries.

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