 Solution

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/2016/s2/3/b/solution

Motion relative to an isotropic radiation field produces a dipole: one broad hot hemisphere and an opposite cool hemisphere. To first order

T (θ) = T_{0} [1 + (v / c) cos θ]

, where

θ = 0

is the forward direction. This is not a narrow Galactic-plane feature and is not the intrinsic small-scale CMB pattern.

 New to topics? Read the docs here!