Ohio State nav bar

Nuclear Physics Seminar - Michael Lisa (The Ohio State University) - Subatomic Smoke Rings: Polarization and Toroidal Vorticity in the QGP

Michael Lisa
March 10, 2021
4:15PM - 5:15PM
Zoom webinar

Date Range
Add to Calendar 2021-03-10 16:15:00 2021-03-10 17:15:00 Nuclear Physics Seminar - Michael Lisa (The Ohio State University) - Subatomic Smoke Rings: Polarization and Toroidal Vorticity in the QGP 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. Zoom webinar Department of Physics physics@osu.edu America/New_York public

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.