Speaker
Description
I will discuss recent advances in constructing and analysing effective field theories (EFTs) that capture the dynamics of collective thermal systems, in particular of dissipative fluids and plasmas described by hydrodynamics and magnetohydrodynamics. I will begin by reviewing how these EFTs, which encode the global symmetries of the underlying microscopic dynamics, are formulated within the Schwinger–Keldysh closed-time-path formalism. Holographic duality has provided valuable insights into the structure of these theories and the behaviour of hydrodynamic observables by offering explicit, calculable toy models. Building on this, I will examine what has been learnt so far about the analytic properties of hydrodynamic correlators when (stochastic) loop corrections are taken into account. Finally, I will present our recent efforts to better understand the derivation of dissipative Schwinger–Keldysh EFTs within the framework of the Wilsonian renormalisation group.
