Energy dependence of the chiral magnetic effect in expanding holographic plasma

Cartwright, Casey; Kaminski, Matthias; Schenke, Björn

doi:10.1103/physrevc.105.034903

Cited by 14 publications

(9 citation statements)

References 69 publications

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“…Remarkably, much less symmetric examples of non-conformal systems (introducing massive particles) still show early-time attractor behavior in the longitudinal pressure. This behavior is not matched by hydrodynamics around an isotropic equilibrium state, however, it can be matched by an anisotropic hydrodynamics description [70], underlining the importance of developing anisotropic descriptions of heavy ion collisions [83,93,[122][123][124][125][126][127][128].…”

Section: Discussionmentioning

confidence: 99%

“…Then, given an initial Φ(v 0 ), the data can be propagated to the next time slice using one's favorite time stepping algorithm. This procedure is not new, it has been used in a large number of publications (see for example [87][88][89][90][91][92][93]). For this reason we relegate a large portion of the details associated with our numerical solutions to appendix A.…”

Section: Holographic Setup and Numericsmentioning

confidence: 99%

“…The initial data required to begin the evolution consists an initial time v 0 , an initial value of the asymptotic coefficient a 4 (dual to the energy density), an initial value for the radial shift diffeomorphism λ as well as a profile for B(z, v 0 ) on the initial time slice (where we have already changed variables, r = 1/z, placing the boundary at the finite location z = 0). For the initial profile we follow previous authors [56,60,93] and choose to parameterize our solutions as deviations away from a vacuum AdS solution to the Einstein equations.…”

Section: Initial Conditionsmentioning

confidence: 99%

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Hydrodynamic attractors for the speed of sound in holographic Bjorken flow

Cartwright¹,

Kaminski²,

Knipfer³

2022

Preprint

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The speed of sound is a central quantity in the exploration of the phase diagram of quantum chromodynamics, specifically through heavy ion collisions analyzed in the Beam Energy Scan at the Relativistic Heavy Ion Collider. Such collisions push the system generically far away from equilibrium, where thermodynamic quantities are not well-defined and the thermodynamic definition for the speed of sound becomes unreliable. In addition, the plasma is approximately boost invariant along the beamline, leading to initially large anisotropy between that direction and the transverse plane. Here, we extend the standard thermodynamic definition to calculate the speed of sound when the system is out of equilibrium, in particular, undergoing Bjorken flow. Then, we compute this out-ofequilibrium speed of sound in a holographic plasma, and demonstrate remarkable agreement with the hydrodynamic prediction. We show by Borel resummation that the holographic system has one attractor for this speed of sound longitudinal, and another transverse, to the direction of Bjorken expansion. Attractor times for various initial flow conditions show that reaching an attractor does not imply or require local thermal equilibrium. In the cases studied, reaching an attractor implies hydrodynamization (quantities evolve approximately according to hydrodynamics), justifying the name hydrodynamic attractor.

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Section: Discussionmentioning

confidence: 99%

Section: Holographic Setup and Numericsmentioning

confidence: 99%

Section: Initial Conditionsmentioning

confidence: 99%

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Hydrodynamic attractors for the speed of sound in holographic Bjorken flow

Cartwright¹,

Kaminski²,

Knipfer³

2022

Preprint

Self Cite

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“…For good introductions to the gauge/gravity duality see [26,27]. The application of the gauge/gravity duality to out-of-equilibrium physics has lead to an improved understanding of relativistic hydrodynamics and might even be relevant to real world experimental observations since it allows to model the time evolution of the quark gluon plasma in heavy ion collisions [21,[28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Non-Hermitian Quantum Quenches in Holography

Morales-Tejera¹,

Landsteiner²

2022

Preprint

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The notion of non-Hermitian PT symmetric quantum theory has recently been generalized to the gauge/gravity duality. We study the evolution of such non-Hermitian holographic field theories when the couplings are varied with time with particular emphasis on the question non-unitary time vs. unitary time evolution. We show that a non-unitary time evolution in the dual quantum theory corresponds to a violation of the Null Energy Condition (NEC) in the bulk of the asymptotically AdS spacetime. We find that upon varying the non-Hermitian coupling the horizon of a bulk AdS black hole shrinks. On the other hand varying the Hermitian coupling in the presence of a constant non-Hermitian coupling still violates the NEC but results in a growing horizon. We also show that by introducing a non-Hermitian gauge field the time evolution can be made unitary, e.g. the NEC in the bulk is obeyed, and an exactly equivalent purely Hermitian description can be given.

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“…Another application could be (de-)confined topological phases and transitions between them, potentially occurring in heavy ion collisions. In that particle physics context, topological field configurations are believed to play a key role in the generation of axial charge asymmetry in heavy ion collisions, and potentially to the matter/anti-matter asymmetry of the universe [7][8][9].…”

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confidence: 99%

Topological confinement in Skyrme holography

Cartwright,

Harms,

Kaminski

et al. 2022

Preprint

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We study phase transitions in five-dimensional Einstein Gravity with a negative cosmological constant, coupled to a Skyrme matter field. These transitions are topological generalizations of the Hawking-Page transition between thermal Anti de Sitter (AdS) spacetime and an AdS black hole. Phases are characterized by a topological number associated with the Skyrme field configuration. Depending on that topological number and on the Skyrme coupling strength, there occur transitions between those phases at two, one, or no value(s) of the temperature. Through the holographic (AdS/CFT) correspondence, these solutions are dual to topologically non-trivial states in a conformal field theory (CFT) with an SU(2)-symmetry, which support either confined or deconfined (quasi-)particles at strong coupling. We compare to similar known phase transitions, and discuss potential applications to confinement in topological phases of condensed matter and the quark-gluon plasma.

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Energy dependence of the chiral magnetic effect in expanding holographic plasma

Cited by 14 publications

References 69 publications

Hydrodynamic attractors for the speed of sound in holographic Bjorken flow

Hydrodynamic attractors for the speed of sound in holographic Bjorken flow

Non-Hermitian Quantum Quenches in Holography

Topological confinement in Skyrme holography

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