TY  - INPR
A1  - Kaminski, Matthias
A1  - Cartwright, Casey
A1  - Knipfer, Marco
A1  - Wondrak, Michael Florian
A1  - Schenke, Björn Peter
A1  - Bleicher, Marcus
T1  - Early time dynamics far from equilibrium via holography
T2  - arXiv
N2  - We investigate the early time dynamics of heavy ion collisions studying the time evolution of the energy-momentum tensor as well as energy-momentum correlations within a uniformly thermalizing holographic QGP. From these quantities, we suggest a far-from equilibrium definition of shear viscosity, which is a crucial property of QCD matter as it significantly determines the generation of elliptic flow already at early times. During an exemplary initial heating phase of the holographic QGP the shear viscosity of entropy density ratio decreases down to 60%, followed by an overshoot to 110% of the near-equilibrium value, η/s=1/(4π). Implications for the QCD QGP are discussed. Subsequently, we consider a holographic QGP which is Bjorken-expanding. Its energy-momentum tensor components have a known hydrodynamic attractor to which all time evolutions collapse independent of the initial conditions. Based on this, we propose a definition for a far from equilibrium speed of sound, and analytically compute its hydrodynamic attractor. Subjecting this Bjorken-expanding plasma to an external magnetic field and an axial chemical potential, we study the chiral magnetic effect far from equilibrium.
Y1  - 2023
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/86323
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-863235
UR  - https://arxiv.org/abs/2309.06435v1
IS  - 2309.06435v1
PB  - arXiv
ER  -