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| Format: | Preprint |
| Published: |
2026
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| Online Access: | https://arxiv.org/abs/2605.21377 |
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| _version_ | 1866913149999906816 |
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| author | Brants, Robbe |
| author_facet | Brants, Robbe |
| contents | Relativistic hydrodynamics successfully provides an effective field theory description for the low energy regime of many out-of-equilibrium systems. On the other hand, in this paper we proof that any stand-alone hydrodynamic EFT is inherently acausal and therefore requires the addition of transient UV modes in order to restore causality. This is made possible by the exponential decay of dissipative hydrodynamics in a majority of the lightcone, allowing the possibility of a causal description that still reduces to the hydrodynamic one at late timescales. We then investigate the emergence and possible restrictions of the non-hydrodynamic modes in these causal UV completions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_21377 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Causal UV completions of relativistic hydrodynamics Brants, Robbe High Energy Physics - Theory High Energy Physics - Phenomenology Mathematical Physics Nuclear Theory Relativistic hydrodynamics successfully provides an effective field theory description for the low energy regime of many out-of-equilibrium systems. On the other hand, in this paper we proof that any stand-alone hydrodynamic EFT is inherently acausal and therefore requires the addition of transient UV modes in order to restore causality. This is made possible by the exponential decay of dissipative hydrodynamics in a majority of the lightcone, allowing the possibility of a causal description that still reduces to the hydrodynamic one at late timescales. We then investigate the emergence and possible restrictions of the non-hydrodynamic modes in these causal UV completions. |
| title | Causal UV completions of relativistic hydrodynamics |
| topic | High Energy Physics - Theory High Energy Physics - Phenomenology Mathematical Physics Nuclear Theory |
| url | https://arxiv.org/abs/2605.21377 |