There are mercifully few equation montages in Theory of Everything, the hazy, heartfelt biopic of celebrity English astrophysicist Stephen Hawking. There is a scene early on where Stephen (Eddie Redmayne), an spiritedly disorganised graduate student searching out a thesis topic at 1960s Cambridge, seeks inspiration by scribbling out theorems on a blackboard, with a hugging, affectionate camera angle and an upbeat piano score. Even then, what strikes clearest is the jittery chalk transcription, a warning of the doom to come. It is one of the film’s few concessions to the tropes of the ‘damaged genius’ biopic: elsewhere, an enthused physics student explains black hole theory…