Journal
PHYSICS LETTERS B
Volume 789, Issue -, Pages 419-425Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2018.12.016
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Funding
- Polish National Science Centre [2016/23/B/ST2/00717]
- BMBF Verbundprojekt - Alice at High Rate [05P2015]
- Deutsche Forschungsgemeinschaft (DFG) [CRC-TR 211]
- COST Action Theory of hot matter and relativistic heavy-ion collisions (THOR) [CA15213]
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It is shown that the description of a relativistic fluid at local thermodynamic equilibrium depends on the particular quantum stress-energy tensor operator chosen, e.g., the canonical or symmetrized Belinfante stress-energy tensor. We argue that the Belinfante tensor is not appropriate to describe a relativistic fluid whose macroscopic polarization relaxes slowly to thermodynamic equilibrium and that a spin tensor, like the canonical spin tensor, is required. As a consequence, the description of a polarized relativistic fluid involves an extension of relativistic hydrodynamics including a new antisymmetric rank-two tensor as a dynamical field. We show that the canonical and Belinfante tensors lead to different predictions for measurable quantities such as spectrum and polarization of particles produced in relativistic heavy-ion collisions. (C) 2018 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license.
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