noun
mathematical physics
Academic field that applies mathematical methods to problems in physics.
彼は大学で数理物理学を専攻している。
He is majoring in mathematical physics at university.
理論物理学 (theoretical physics) is a broader field that may use less rigorous mathematics, while 数理物理学 specifically emphasizes the mathematical formulation and rigor.
Compound of 数理 (mathematical theory) and 物理学 (physics).