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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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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 3 Pith papers
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Longitudinal Dynamics of Large and Small Systems from a 3D Bayesian Calibration of RHIC Top-energy Collision Data
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.
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Kinetic Theory of Quasiparticles, Retarded Correlators and Hydrodynamics
For a massive Maxwell-Boltzmann gas in the relaxation-time approximation, finite mass removes the propagating sound mode, leaving purely imaginary modes, while shear and diffusion modes stay close to the massless results.
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Entropy production in pp and Pb-Pb collisions at energies available at the CERN Large Hadron Collider
From LHC data on particle spectra and femtoscopic radii, the entropy per unit rapidity is determined for pp and Pb-Pb collisions, and simulations trace about 95% of that entropy to the first fm/c.
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