2020 (source code)
= 2020
{scope}
{title2=A15088W1}
Source paper: https://www.whatdotheyknow.com/request/oxford_physics_past_papers_2/response/2340696/attach/8/Physics%20Papers%202019.pdf?cookie_passthrough=1
The cover establishes Hilary Term 2020 despite the source bundle's 2019 filename. Use $\hbar=c=1$, the <Minkowski metric> $\eta=\operatorname{diag}(1,-1,-1,-1)$, and $\not p=\gamma^\mu p_\mu$ for <Feynman slash notation>. In question 1, the repeated species index in the <Yukawa interaction> is summed over $i=1,2$. The spatial <mode expansion of a free field>[mode expansions] in question 2 are at a fixed time.
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