Hydrodynamic attractors for the speed of sound in holographic Bjorken flow

Cartwright, Casey; Kaminski, Matthias; Knipfer, Marco

doi:10.1103/physrevd.107.106016

Cited by 6 publications

(4 citation statements)

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“…with the pseudorapidity ξ = 1 2 ln[(t + x 3 )/(t − x 3 )], the spatial coordinates x 1 , x 2 , x 3 and the proper time τ = t 2 − x 2 3 with the Stefan-Boltzmann constant σ SB [10]. Similar to the previous section, a time-dependent metric provides the thermalizing plasma state.…”

Section: Speed Of Sound Far From Equilibriummentioning

confidence: 89%

“…We use the temperature definition T = ( /σ SB ) 1/4 , which is sometimes called pseudo temperature [1]. We holographically compute the speed of sound far from equilibrium according to the proposed definition [10]…”

Section: Speed Of Sound Far From Equilibriummentioning

confidence: 99%

“…This complication now only allows numerical solutions for the background metric describing the time-dependent state, using [2]. It can be analytically shown [10] that the pressure anisotropy attractor [11] implies an attractor for the time-dependent speed of sound…”

Section: Speed Of Sound Far From Equilibriummentioning

confidence: 99%

“…All initial states evolve towards the sound attractor very quickly, around τT < 1. The perpendicular speed of sound has an analogous attractor [10].…”

Section: Speed Of Sound Far From Equilibriummentioning

confidence: 99%

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Early time dynamics far from equilibrium via holography

Kaminski,

Cartwright,

Knipfer

et al. 2024

Proceedings of 11th International Conference on Hard and Elecctromagnetic Probes of High-Energy Nuclear Collisions — PoS(HardPr

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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.

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Section: Speed Of Sound Far From Equilibriummentioning

confidence: 89%

Section: Speed Of Sound Far From Equilibriummentioning

confidence: 99%

Section: Speed Of Sound Far From Equilibriummentioning

confidence: 99%

“…All initial states evolve towards the sound attractor very quickly, around τT < 1. The perpendicular speed of sound has an analogous attractor [10].…”

Section: Speed Of Sound Far From Equilibriummentioning

confidence: 99%

See 2 more Smart Citations