One-form superfluids and magnetohydrodynamics

Understand

We use the framework of generalised global symmetries to study various hydrodynamic regimes of hot electromagnetism.

• We formulate the hydrodynamic theories with an unbroken or a spontaneously broken U(1) one-form symmetry.
• The latter of these describes a one-form superfluid, which is characterised by a vector Goldstone mode and a two-form superfluid velocity.
• Two special limits of this theory have been studied in detail: the string fluid limit where the U(1) one-form symmetry is partly restored, and the electric limit in which the symmetry is completely broken.