Orateur
Description
Describing the transition between normal and superfluid phases requires an effective theory that captures the coupled dynamics of the order parameter and the conserved charges of the system. In this talk, I present a relativistic effective field theory for nearly critical superfluids, constructed through three complementary approaches. I first outline the derivation within the framework of hydrodynamics, followed by an alternative construction using the Keldysh-Schwinger effective action. Finally, I present a holographic computation that analytically confirms the transport properties identified by the first two techniques. This unified description provides a robust framework for superfluid critical behaviour and demonstrates complete agreement between the different formalisms.
