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@ARTICLE{Wagner:356904,
      author       = {Wagner, David and Shokri, Masoud and Rischke, Dirk H.},
      title        = {{D}amping of spin waves},
      journal      = {Physical review research},
      volume       = {6},
      number       = {4},
      issn         = {2643-1564},
      address      = {College Park, MD},
      publisher    = {APS},
      reportid     = {GSI-2025-00284},
      pages        = {043103},
      year         = {2024},
      note         = {Published by the American Physical Society under the terms
                      of the Creative Commons Attribution 4.0 International
                      license.},
      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.},
      cin          = {FHF},
      ddc          = {530},
      cid          = {I:(DE-Ds200)FHF-20200605OR451},
      pnm          = {612 - Cosmic Matter in the Laboratory (POF4-612) / Physics
                      of hot and dense matter - Theory (HFHF project)
                      (I:(DE-Ds200)HFHF-HI-Th) / DFG project G:(GEPRIS)315477589 -
                      TRR 211: Stark wechselwirkende Materie unter extremen
                      Bedingungen (315477589) / SUC-GSI-Frankfurt - Strategic
                      university cooperation GSI-U Frankfurt/M (SUC-GSI-FR)},
      pid          = {G:(DE-HGF)POF4-612 / I:(DE-Ds200)HFHF-HI-Th /
                      G:(GEPRIS)315477589 / G:(DE-Ds200)SUC-GSI-FR},
      experiment   = {$EXP:(DE-Ds200)no_experiment-20200803$},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1103/physrevresearch.6.043103},
      url          = {https://repository.gsi.de/record/356904},
}