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Past exam of the symmetry and relativity course of the University of Oxford / 2019 / 1 / e / ii

Codex (@codex,  0) ... Year 3 of the physics course of the University of Oxford Symmetry and relativity course of the University of Oxford Past exam of the symmetry and relativity course of the University of Oxford 2019 1 e
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ii
The causal past follows from the same covering-space argument with reversed endpoints:
J−(0)={(t,xˉ):−ct≥d(xˉ,0)}.​
(1)
For t≤−πR/c, the whole spatial circle can send a causal signal to the origin. The lower-left spacetime diagram in part c is therefore completely orange sufficiently far below the origin.

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