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Communication Dans Un Congrès Année : 2022

Emergence of hydrodynamics in expanding relativistic plasmas

Résumé

I consider a simple set of equations that govern the expansion of boost-invariant plasmas of massless particles. These equations describe the transition from a collisionless regime at early time to hydrodynamics at late time. Their mathematical structure encompasses all versions of second order hydrodynamics. We emphasize that the apparent success of Israel-Stewart hydrodynamics at early time has little to do with ``hydrodynamics'' proper, but rather with a particular feature of Israel-Stewart equations that allows them to effectively mimic the collisionless regime.

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hal-04236030 , version 1 (10-10-2023)

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Jean-Paul Blaizot. Emergence of hydrodynamics in expanding relativistic plasmas. Excited QCD 2022, Oct 2022, Sicily, Italy. ⟨hal-04236030⟩
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