Speaker
Description
In this talk, I will review recent progress in formulating effective field theories for hydrodynamic-like states with higher-form symmetries. These symmetries are associated with the conservation of extended objects that constitute the fluid. One example is a plasma composed of one-dimensional strings, or magnetic flux lines, whose dynamics are described by magnetohydrodynamics. I will discuss different classes of such theories and present our new formulation of magnetic diffusion in neutron stars. A closely related framework can also be applied to superfluids, providing a novel perspective on their dynamics. In the final part of the talk, I will present recent results on the physics of superfluids and conclude with a discussion of open problems related to the description of superfluids in neutron stars.