 2019

Source paper: www.whatdotheyknow.com/request/oxford_physics_past_papers_2/response/2340696/attach/7/Physics%20Papers%202018.pdf?cookie_passthrough=1

The cover establishes Hilary Term 2019 despite the bundle's 2018 filename. Use $\hslash =c=1$. For questions 2 and 3 the Minkowski metric has signature $(+,-,\dots ,-)$. Question 1 has a preferred time coordinate and does not assume Lorentz invariance.