I am confused with the global symmetries of $\mathcal{N}=2$ SYM. On one hand I know that the theory has a $U(2)_R = SU(2)_R \times U(1)_R$ symmetry. Now, there exists also a $U(1)_B$ global symmetry. What are the rest of global symmetries?

Additionally, something that confuses me is something on the lecture notes of Marino on Donaldson-Witten theory. In these lecture notes in section 6.2 the topological twist is being performed and I am very confused on how $K'=SU'(2)_{+} \otimes SU(2)_{-}$ is obtained (after the twist) and where it comes from.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.