I was looking at the course structure of a MSc (physics) program and all the subjects that are required are all physics - no math. Some of the topics are general relativity, particle physics, physical cosmology and quantum mechanics - would the mathematics required for such topics be beyond undergraduate level math? Or is the math generally taught concurrently within the class? And for a PhD student, are most of the mathematics they need undergraduate level mathematics? Do they generally take classes or is it all just research?