Over the past 5 years, there has been intense focus on hyperon polarization in heavy ion collisions, as it is believed to probe the vortical substructure of the fluid created in the collision. Both relativistic hydrodynamics and transport calculations, considered as a coarse-grained fluid, reproduce some experimental observations remarkably well, while they fail at others. So far, studies have focused on polarization and vorticity in non-central symmetric (A+A) collisions. I will discuss recent suggestions to study flow fields with quite different structure. The first is that created in central p+A collisions, in which the (assumed) fluid may be initialized with a nontrivial longitudinal flow structure. The second corresponds to a jet locally injecting energy and momentum into the expanding fluid around it. In each case, toroidal vortex structures may result. Using viscous relativistic 3D hydrodynamics, implemented in the MUSIC package, I present calculations of these structures, including quantitative predictions of their manifestation in experiment.
Zoom link: https://osu.zoom.us/j/94447058600?pwd=eFFPQURXbjBwbDBLcHNVSEVQNjZhdz09
Passcode (if required): 301081.
