Thermally Fluctuating Second-Order Viscous Hydrodynamics and Heavy-Ion   Collisions
  The fluctuation-dissipation theorem requires the presence of thermal noise in viscous fluids. The time and length scales of heavy ion collisions are small enough so that the thermal noise can have a measurable effect on observables. Thermal noise is included in numerical simulations of high energy lead-lead collisions, increasing average values of the momentum eccentricity and contributing to its event by event fluctuations. 
C. Young, J. I. Kapusta, C. Gale, S. Jeon, and B. Schenke
nucl-th