What subfield in physics has the most technical math

[BornCane]

what sub field has the hardest math generally speaking

General Relativity?
Quantun Mechanics?
String Theory?
Fluid Dynamics?

something else?

I know a lot of this is based on a individual basis, but what would be the consensus if such a question was asked?

 

[micromass]

You won't like this answer, but if you go deep enough, they all have very difficult math and unsolved problems.

 

[Mmm_Pasta]

I agree with micromass. Optics, for example, has a lot of math research related to numerical analysis. A lot of interesting math there - some of it being the same math found in general relativity! As far as I know, every physics field will involve difficult math and have interesting problems to solve. I'm not sure you will actually see a consensus on this topic.