Thermalization & hydrodynamics in Bjorken & Gubser flows
The dynamical scaling behavior of hydrodynamic and non-hydrodynamic moments of the distribution function is studied 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, dimensionful 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.
- Research Organization:
- The Ohio State Univ., Columbus, OH (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); ExtreMe Matter Institute (EMMI); Fonds de Recherche du Quebec— Nature et Technologies (FRQNT)
- Contributing Organization:
- BEST Collaboration; JETSCAPE Collaboration
- Grant/Contract Number:
- SC0004286; ACI-1550223
- OSTI ID:
- 1547837
- Alternate ID(s):
- OSTI ID: 1604311
- Report Number(s):
- arXiv:1807.05462v1; S0375947418303919; PII: S0375947418303919
- Journal Information:
- Nuclear Physics. A, Journal Name: Nuclear Physics. A Vol. 982 Journal Issue: C Conference: 27.International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2018), Venice (Italy), 13-19 May 2018; ISSN 0375-9474
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- Netherlands
- Language:
- English
Web of Science
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