High Energy Theory Seminar

In my talk I will explicitly describe what topological termspreserving time-reversal symmetry one can introduce in 3+1d Yang-Mills theory. Classification of such terms corresponds to classification of SPTs via cobordisms proposed by Kapustin and Freed-Hopkins. Different topological terms can be detected, for example, by putting the theory on generically non-orientable manifolds. The talk will be mostly based on a joint work with Juven Wang and Meng Guo.