Prof. Nabil Iqbal (University of Amsterdam)
Just as ordinary global symmetries in quantum field theory are associated with conserved currents that count particle numbers, “generalized” global symmetries are associated with higher-form conserved currents that can be understood as counting higher-dimensional objects such as strings. I will discuss how this idea applies to the long-distance structure of theories of electromagnetism, where a key role is played by a higher-form conserved current that counts the density of magnetic flux lines. I will then use this higher form current to reformulate dissipative magnetohydrodynamics from the point of view of generalized symmetries and effective field theory. I will also discuss the structure of the holographic dual to magnetohydrodynamics, which involves a two-form field propagating in the bulk.