Speaker
Description
The study of critical dynamics in the vicinity of the superfluid phase transition presents an unresolved problem: determining the power-law behavior of viscosity upon approaching the critical point. The corresponding dynamic critical exponent remains unknown. Within a phenomenological model, direct computations prove exceedingly complex; the renormalization procedure involves the mixing of nearly 50 composite operators, leading even to an incorrect sign for the exponent in first-order perturbation theory.
We will discuss how to derive a microscopically justified hydrodynamic equation starting from a quantum field theory model. As a useful benefit, it will be demonstrated that this framework provides an alternative, more streamlined method for computing the critical viscosity.
