Speaker
Description
The search for the QCD critical point in heavy-ion collisions requires the inclusion of fluctuations in hydrodynamic simulations of Quark-Gluon Plasma (QGP). Schwinger-Keldysh Effective Field Theory (SK-EFT) systematically incorporates these fluctuations, extending beyond classical hydrodynamics, which accounts only for dissipation. After a brief review of SK-EFT, we discuss how linear response results obtained from experimental data can be incorporated into this framework to predict nonlinear response in diffusive systems. This is closely related to the emergence of a universal scaling function in the structure of real-time correlation functions. Furthermore, we argue that this universality persists even in a causal diffusive system. Finally, we comment on the relevance of these results to QGP dynamics near the QCD critical point.
