Non-Gaussian hydrodynamic fluctuations in an expanding relativistic fluid
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arXiv
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| Auteurs principaux: | , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866914520585207808 |
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| author | Basar, Gokce Song, Shuo |
| author_facet | Basar, Gokce Song, Shuo |
| contents | We consider non-equilibrium evolution of non-Gaussian fluctuations in a hydrodynamic system undergoing a boost-invariant expansion described by Bjorken flow. We derive the evolution equations for two- and three-point velocity correlators using the effective field theory framework and present analytical solutions for them. We show that the average Landau frame is better suited for studying non-Gaussian fluctuations of velocity when relativistic effects are important. In the Bjorken background, the average Landau frame corresponds to the density frame. We demonstrate that the three-point correlators depend nonlinearly on the non-equilibrium dynamics of the two-point functions, and exhibit non-trivial effects such as memory. The importance of these effects in the context of the search for the QCD critical point via fluctuations is discussed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_27730 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Non-Gaussian hydrodynamic fluctuations in an expanding relativistic fluid Basar, Gokce Song, Shuo High Energy Physics - Theory Nuclear Theory We consider non-equilibrium evolution of non-Gaussian fluctuations in a hydrodynamic system undergoing a boost-invariant expansion described by Bjorken flow. We derive the evolution equations for two- and three-point velocity correlators using the effective field theory framework and present analytical solutions for them. We show that the average Landau frame is better suited for studying non-Gaussian fluctuations of velocity when relativistic effects are important. In the Bjorken background, the average Landau frame corresponds to the density frame. We demonstrate that the three-point correlators depend nonlinearly on the non-equilibrium dynamics of the two-point functions, and exhibit non-trivial effects such as memory. The importance of these effects in the context of the search for the QCD critical point via fluctuations is discussed. |
| title | Non-Gaussian hydrodynamic fluctuations in an expanding relativistic fluid |
| topic | High Energy Physics - Theory Nuclear Theory |
| url | https://arxiv.org/abs/2604.27730 |