Matching the Nonequilibrium Initial Stage of Heavy Ion Collisions to Hydrodynamics with QCD Kinetic Theory

被引：133

作者：

Kurkela, Aleksi ^{[1
,2
]}

Mazeliauskas, Aleksas ^{[3
,4
]}

Paquet, Jean-Francois ^{[4
,5
]}

Schlichting, Soeren ^{[6
,7
]}

Teaney, Derek ^{[4
]}

机构：

[1] CERN, Theoret Phys Dept, Geneva, Switzerland

[2] Univ Stavanger, Fac Sci & Technol, N-4036 Stavanger, Norway

[3] Heidelberg Univ, Inst Theoret Phys, D-69120 Heidelberg, Germany

[4] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

[5] Duke Univ, Dept Phys, Durham, NC 27708 USA

[6] Univ Bielefeld, Fak Phys, D-33615 Bielefeld, Germany

[7] Univ Washington, Dept Phys, Seattle, WA 98195 USA

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 122卷 / 12期

关键词：

COLOR GLASS CONDENSATE; QUARK-GLUON PLASMA; THERMALIZATION; PERSPECTIVE;

D O I：

10.1103/PhysRevLett.122.122302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

High-energy nuclear collisions produce a nonequilibrium plasma of quarks and gluons which thermalizes and exhibits hydrodynamic flow. There are currently no practical frameworks to connect the early particle production in classical field simulations to the subsequent hydrodynamic evolution. We build such a framework using nonequilibrium Green's functions, calculated in QCD kinetic theory, to propagate the initial energy-momentum tensor to the hydrodynamic phase. We demonstrate that this approach can be easily incorporated into existing hydrodynamic simulations, leading to stronger constraints on the energy density at early times and the transport properties of the QCD medium. Based on (conformal) scaling properties of the Green's functions, we further obtain pragmatic bounds for the applicability of hydrodynamics in nuclear collisions.

引用

页数：7

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