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Hydrodynamic flow in small systems, or: "How the heck is it possible that a system emitting only a dozen particles can be described by fluid dynamics?"

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arxiv 1904.06592 v1 pith:AVNOYVUT submitted 2019-04-13 nucl-th hep-phnucl-ex

Hydrodynamic flow in small systems, or: "How the heck is it possible that a system emitting only a dozen particles can be described by fluid dynamics?"

classification nucl-th hep-phnucl-ex
keywords dynamicsfluidwillcollisionsrelativisticaddressbetterbreaks
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The "unreasonable effectiveness" of relativistic fluid dynamics in describing high energy heavy-ion and even proton-proton collisions are demonstrated and discussed. Several recent ideas of optimizing relativistic fluid dynamics for the specific challenges posed by such collisions will be presented, and some thoughts will be offered why the framework works better than originally expected. I will also address the unresolved question where exactly hydrodynamics breaks down, and why.

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Cited by 1 Pith paper

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    nucl-ex 2026-01 conditional novelty 6.0

    A 3D Bayesian calibration of RHIC Au-Au and d-Au data constrains the longitudinal initial state and QGP viscosity, and its posterior predicts p-Au and 3He-Au flow measurements.