 Solution

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

The same Lorentz transformation maps the past light cone to itself. In the primed axes the causal past is

J^{-} (0) = {(t^{'}, x^{'}) : c t^{'} \leq - ∣ x^{'} ∣},

the orange region in the upper-right spacetime diagram of part c. Future and past are not interchanged by the standard boost.

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