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1QFT,String theory.– user1709828Commented Feb 2, 2013 at 23:04
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2Is there such course in your university? You might try to talk to those professors teaching these course as they might give you good suggestion, and even a recommendation letters.– unsymCommented Feb 2, 2013 at 23:06
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4It is a bit hard. But if you can accept the basics in QM as axiom and have a good mathematical background in say, complex analysis, Greens function, spectal analysis, calculus, differential equation. I would say you could get a good grade in introduction of QFT. Notice that some courses might focus more on physics and some on mathematics, you can only know that by talking with course instructor.– unsymCommented Feb 2, 2013 at 23:23
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3@user1709828 i have also migrated from maths to physics (actually QM). some knowledge in functional analysis and operator algebra helped me a lot. one reason for developing these subjects was to understand QM and quant stat mech. all the best for your journey.– RSGCommented Feb 3, 2013 at 7:57
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3If you are on a graduate admissions committee for a physics department, applications such as yours will bring some questions to mind. (i) How do they know they want to do physics if they don't know anything about it? (ii) How do I know they have any talent for physics? I don't see how you can address these questions without taking any physics courses. There are a number of mathematics departments with physicists in them, and you have a much better chance of getting in if you apply to one of these places. (But make sure they aren't just doing physics, but the right kind of physics.)– Peter ShorCommented Feb 3, 2013 at 16:21
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