Vorticity and Particle Polarization in Relativistic Heavy-Ion Collisions

Abstract

We review studies of vortical motion and the resulting global polarization of $\Lambda$ and $\bar{\Lambda }$ hyperons in heavy-ion collisions, in particular, within 3FD model. 3FD predictions for the global midrapidity polarization in the FAIR-NICA energy range are presented. The 3FD simulations indicate that energy dependence of the observed global polarization of hyperons in the midrapidity region is a consequence of the decrease of the vorticity in the central region with the collision energy rise because of pushing out the vorticity field into the fragmentation regions. At high collision energies this pushing-out results in a peculiar vortical structure consisting of two vortex rings: one ring in the target fragmentation region and another one in the projectile fragmentation region with matter rotation being opposite in these two rings.

arXiv comment8 pages, 6 figures, Contribution to proceedings of International Workshop "Infinite and Finite Nuclear Matter" (INFINUM), March 20-22, 2019, JINR BLTP, Dubna

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• Correlation between global polarization, angular momentum and flow in heavy-ion collisions
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• Vortex rings from high energy central p+A collisions
• Spin polarization dynamics in the Bjorken-expanding resistive MHD background
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• Global $\Lambda$ polarization in heavy-ion collisions at energies 2.4--7.7 GeV: Effect of Meson-Field Interaction
• Calculation of acceleration effects using the Zubarev density operator
• Propagation of spin channel waves
• Collective dynamics of polarized spin-half fermions in relativistic heavy-ion collisions
• Equal-time kinetic equations in a rotational field
• Vortex rings in heavy-ion collisions at energies $\sqrt{s_{NN}}=$ 3--30 GeV and possibility of their observation
• On Ambiguity of Definition of Shear and Spin-Hall Contributions to $\Lambda$ Polarization in Heavy-Ion Collisions
• Global $\Lambda$ polarization in heavy-ion collisions at high baryon density
• Examination of the possibility of ${\pi }^0$ condensation and magnetization in freely interpenetrating nuclei