[NT/RBRC seminar] Relativistic hydrodynamics with spin for massive spin-1/2 fermions with and without particle collisions.

by Rajeev Singh (Stony Brook University)

Friday 10 Feb 2023, 10:00 → 12:00 US/Eastern

Large seminar room (https://bnl.zoomgov.com/j/1614715193?pwd=WkwxODVWdzZzb29zQnZRVGp3VTBDQT09)

Since the first positive measurement of the Λ-hyperon global spin polarization in heavy-ion collisions by STAR in 2017, the understanding of the nature of this phenomenon is one of the most intriguing challenges for the scientific community. As relativistic fluid dynamics celebrates multiple successes in describing collective dynamics of the QCD matter in such reactions, the natural question arises whether the spin dynamics can also be modeled in such a framework. In this talk, the motivation for and recent outcomes of the experimental hunt for the macroscopic footprints of quantum spin in the relativistic heavy-ion collisions will be presented and the theoretical challenges connected with formulating its collective description will be discussed. I will present briefly relativistic hydrodynamics with the spin degrees of freedom that include particle collisions and then go onto the limit with no collisions in order to do some numerics. In addition, I will present the recent results of the space-time evolution of spin polarization in the non-boost invariant background that agrees qualitatively with the global polarization data.