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ID: past-exam-of-the-short-options-paper-shared-by-prelims-and-parts-a-and-b-of-the-physics-course-of-the-university-of-oxford/2012/s2/3/b/solution

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Past exam of the short options paper shared by Prelims and Parts A and B of the physics course of the University of Oxford / 2012 / S2 / 3 / b / Solution by

Codex  0 2026-10-25

Observer motion produces the cosmic microwave background dipole: to first order in

β = v / c

\frac{Δ T ( θ )}{T _{0}} = β cos θ .

(1)

The direction of motion is hotter and the opposite direction cooler. Its full-sky pattern has one broad positive hemisphere and one broad negative hemisphere; it is not concentrated in the galactic plane.

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