Journal Article

GSI-2025-00284

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Damping of spin waves

Wagner, D. (Corresponding author) ; Shokri, M. ; Rischke, D. H.GSI*

2024
APS College Park, MD

Please use a persistent id in citations: doi:10.1103/physrevresearch.6.043103  doi:10.15120/GSI-2025-00284

Abstract: We show that, in ideal-spin hydrodynamics, the components of the spin tensor follow damped wave equations. The damping rate is related to nonlocal collisions of the particles in the fluid, which enter at first order in in a semiclassical expansion. This rate provides an estimate for the timescale of spin equilibration and is computed by considering a system of spin-1/2 fermions interacting via a quartic self-interaction as well as via (screened) one-gluon exchange. It is found that the relaxation times of the components of the spin tensor can become very large compared to the usual dissipative timescales of the system. Our results suggest that the spin degrees of freedom in a heavy-ion collision may not be in equilibrium by the time of freeze-out, and thus should be treated dynamically.

Note: Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license.

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Contributing Institute(s):

1. Helmholtz ForschAkad Hess. f. FAIR, HFHF (FHF)

Research Program(s):

1. 612 - Cosmic Matter in the Laboratory (POF4-612) (POF4-612)
2. Physics of hot and dense matter - Theory (HFHF project) (I:(DE-Ds200)HFHF-HI-Th) (I:(DE-Ds200)HFHF-HI-Th)
3. DFG project G:(GEPRIS)315477589 - TRR 211: Stark wechselwirkende Materie unter extremen Bedingungen (315477589) (315477589)
4. SUC-GSI-Frankfurt - Strategic university cooperation GSI-U Frankfurt/M (SUC-GSI-FR) (SUC-GSI-FR)

Experiment(s):

1. no experiment theory work (theory)

Appears in the scientific report 2024

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