2018 (source code)
= 2018
{scope}
{title2=A15272W1}
Source paper: https://www.whatdotheyknow.com/request/oxford_physics_past_papers_2/response/2340696/attach/6/Physics%20Papers%202017.pdf?cookie_passthrough=1
The dated cover establishes Trinity Term 2018, despite the containing bundle's 2017 filename. Use <natural units>, the <Minkowski metric> $g=\operatorname{diag}(1,-1,-1,-1)$ and the <Feynman i-epsilon prescription>. In question 1(a), $D=4-\epsilon$ and $e_D=\mu^{\epsilon/2}e$. The supplied transverse <photon propagator> selects <Landau gauge> within the Lorenz-gauge family. In question 2(a), distinguish the kernels in the stated <generating functional> from time-ordered <Wick contractions>, as explained below.
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