Nonconformal kinetic theory and hydrodynamics for Bjorken flow
Abstract
Using and comparing kinetic theory and second-order Chapman-Enskog hydrodynamics, we study the nonconformal dynamics of a system undergoing Bjorken expansion. We use the concept of “free-streaming fixed lines” for scaled shear and bulk stresses in nonconformal kinetic theory and hydrodynamics, and show that these fixed lines behave as early-time attractors and repellors of the evolution. In the conformal limit, the free-streaming fixed lines reduce to the well-known fixed points of conformal Bjorken dynamics. A new fixed point in the free streaming regime is identified which lies at the intersection of these fixed lines. Contrary to the conformal scenario, both kinetic theory and hydrodynamics predict the absence of attractor behavior in the normalized shear stress channel. In kinetic theory a far-off-equilibrium attractor is found for the normalized effective longitudinal pressure, driven by rapid longitudinal expansion. Second-order viscous hydrodynamics fails to accurately describe this attractor. From a thorough analysis of the free-streaming dynamics in Chapman-Enskog hydrodynamics we conclude that this failure results from an inaccurate approximation of the fixed lines and a related incorrect description of the nature of the fixed point. A modified anisotropic hydrodynamic description is presented that provides excellent agreement with kinetic theory results and reproduces the far-from-equilibrium attractormore »
- Publication Date:
- Research Org.:
- The Ohio State Univ., Columbus, OH (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1846333
- Alternate Identifier(s):
- OSTI ID: 1979863
- Grant/Contract Number:
- SC0004286
- Resource Type:
- Published Article
- Journal Name:
- Physical Review C
- Additional Journal Information:
- Journal Name: Physical Review C Journal Volume: 105 Journal Issue: 2; Journal ID: ISSN 2469-9985
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Physics; hydrodynamic models; relativistic heavy-ion collisions; relativistic kinetic theory
Citation Formats
Jaiswal, Sunil, Chattopadhyay, Chandrodoy, Du, Lipei, Heinz, Ulrich, and Pal, Subrata. Nonconformal kinetic theory and hydrodynamics for Bjorken flow. United States: N. p., 2022.
Web. doi:10.1103/PhysRevC.105.024911.
Jaiswal, Sunil, Chattopadhyay, Chandrodoy, Du, Lipei, Heinz, Ulrich, & Pal, Subrata. Nonconformal kinetic theory and hydrodynamics for Bjorken flow. United States. https://doi.org/10.1103/PhysRevC.105.024911
Jaiswal, Sunil, Chattopadhyay, Chandrodoy, Du, Lipei, Heinz, Ulrich, and Pal, Subrata. Wed .
"Nonconformal kinetic theory and hydrodynamics for Bjorken flow". United States. https://doi.org/10.1103/PhysRevC.105.024911.
@article{osti_1846333,
title = {Nonconformal kinetic theory and hydrodynamics for Bjorken flow},
author = {Jaiswal, Sunil and Chattopadhyay, Chandrodoy and Du, Lipei and Heinz, Ulrich and Pal, Subrata},
abstractNote = {Using and comparing kinetic theory and second-order Chapman-Enskog hydrodynamics, we study the nonconformal dynamics of a system undergoing Bjorken expansion. We use the concept of “free-streaming fixed lines” for scaled shear and bulk stresses in nonconformal kinetic theory and hydrodynamics, and show that these fixed lines behave as early-time attractors and repellors of the evolution. In the conformal limit, the free-streaming fixed lines reduce to the well-known fixed points of conformal Bjorken dynamics. A new fixed point in the free streaming regime is identified which lies at the intersection of these fixed lines. Contrary to the conformal scenario, both kinetic theory and hydrodynamics predict the absence of attractor behavior in the normalized shear stress channel. In kinetic theory a far-off-equilibrium attractor is found for the normalized effective longitudinal pressure, driven by rapid longitudinal expansion. Second-order viscous hydrodynamics fails to accurately describe this attractor. From a thorough analysis of the free-streaming dynamics in Chapman-Enskog hydrodynamics we conclude that this failure results from an inaccurate approximation of the fixed lines and a related incorrect description of the nature of the fixed point. A modified anisotropic hydrodynamic description is presented that provides excellent agreement with kinetic theory results and reproduces the far-from-equilibrium attractor for the scaled longitudinal pressure.},
doi = {10.1103/PhysRevC.105.024911},
journal = {Physical Review C},
number = 2,
volume = 105,
place = {United States},
year = {Wed Feb 23 00:00:00 EST 2022},
month = {Wed Feb 23 00:00:00 EST 2022}
}
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