Non-Gaussian hydrodynamic fluctuations in an expanding relativistic fluid
This paper derives analytical evolution equations for two- and three-point velocity correlators in a boost-invariant relativistic fluid using effective field theory, demonstrating that the Landau frame is optimal for studying non-Gaussian fluctuations and revealing that three-point correlations exhibit nonlinear memory effects dependent on two-point dynamics, which are crucial for the search for the QCD critical point.