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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2504.18754 |
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| _version_ | 1866916707922083840 |
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| author | Berges, Jürgen Denicol, Gabriel S. Heller, Michal P. Preis, Thimo |
| author_facet | Berges, Jürgen Denicol, Gabriel S. Heller, Michal P. Preis, Thimo |
| contents | Nonthermal fixed points are paradigmatic far-from-equilibrium phenomena of relevance to high-energy physics, cosmology, and cold atomic gases. We propose that, despite their intrinsically nonequilibrium nature, nonthermal fixed points give rise to hydrodynamic excitations otherwise known in the vicinity of thermal equilibrium. As a result, nonthermal fixed points can also be characterized by transport coefficients, such as a far-from-equilibrium, and therefore manifestly time-dependent, incarnation of shear viscosity. We corroborate our proposal with explicit studies using relativistic kinetic theory with binary collisions of massless particles in the 14-moment approximation and comparisons to QCD kinetic theory simulations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_18754 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Far from equilibrium hydrodynamics of nonthermal fixed points Berges, Jürgen Denicol, Gabriel S. Heller, Michal P. Preis, Thimo High Energy Physics - Theory Quantum Gases Nonthermal fixed points are paradigmatic far-from-equilibrium phenomena of relevance to high-energy physics, cosmology, and cold atomic gases. We propose that, despite their intrinsically nonequilibrium nature, nonthermal fixed points give rise to hydrodynamic excitations otherwise known in the vicinity of thermal equilibrium. As a result, nonthermal fixed points can also be characterized by transport coefficients, such as a far-from-equilibrium, and therefore manifestly time-dependent, incarnation of shear viscosity. We corroborate our proposal with explicit studies using relativistic kinetic theory with binary collisions of massless particles in the 14-moment approximation and comparisons to QCD kinetic theory simulations. |
| title | Far from equilibrium hydrodynamics of nonthermal fixed points |
| topic | High Energy Physics - Theory Quantum Gases |
| url | https://arxiv.org/abs/2504.18754 |