After 3 years of study of mathematics and physics, I wish to write my bachelor thesis, starting in September, on a mathematical physics subject. I have prior mathematical knowledge of differential geometry and algebraic topology, functional analysis and complex analysis. I don't necessary have to come up with the topic myself, although it is always better to write something on your personal interests.
I was wondering whether one of you knows about any interesting topic in mathematical physics suited for a bachelor thesis, the level of the topic may be at graduate level since I have 4 months of full time writing.
Thanks in advance