CANCELLED: Hydrodynamics and transport in the chiral limit

This seminar has been cancelled.

I will discuss the evolution of hydrodynamic fluctuations for QCD matter below T_c in the chiral limit. The hydrodynamic theory is ordinary hydrodynamics at long distances, while superfluid-like at short distances. In the presence of a finite pion mass, the latter is represented by pions (the Goldstone modes), reflecting the broken SU(2)_L × SU(2)_R symmetry. The superfluid degrees of freedom contribute to the transport coefficients of the ordinary theory at long distances. This determines, in some cases, the leading dependence of the transport parameters of QCD on the pion mass. I will make some comments on the predictions of this computation, as the system approaches the O(4) critical point.