Thermalization & hydrodynamics in Bjorken & Gubser flows

Abstract The dynamical scaling behavior of hydrodynamic and non-hydrodynamic moments of the distribution function is stud- ied using third-order Chapman-Enskog hydrodynamics and anisotropic hydrodynamics for systems undergoing Bjorken and Gubser expansions, where exact solutions of the Boltzmann equation in Relaxation Time Approximation (RTA) are available for comparison. While dimensionless quantities like normalized shear, pressure anisotropy and normalized entropy show at late times universal scaling relations with small (large) Knudsen number for Bjorken (Gubser) flows, di- mensionful quantities like the entropy per unit rapidity do not. Although the two hydrodynamic approximation schemes describe the exact attractors for normalized shear with high accuracy, their description for the normalized entropy is less precise. We attribute this to non-negligible couplings to non-hydrodynamic modes in the entropy evolution.

• Publication year

  2018

• Venue

  Nuclear Physics

• Publication date

  2018-07-14

• Fields of study

  Physics

• Identifiers
  DOI 10.1016/j.nuclphysa.2018.11.005arXiv 1807.05462
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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