Rapidity dependence in holographic heavy ion collisions

Schee, Wilke van der; Schenke, Bjoern

doi:10.1103/physrevc.92.064907

Cited by 24 publications

(33 citation statements)

References 49 publications

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“…Despite the fact that QCD is not conformal, supersymmetric, or infinitely strongly coupled, and has only a small number (N = 3) of colors, the comparison of heavy ion phenomenology with predictions based on AdS/CFT duality (of "holography") has turned out to be quite fruitful [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. At temperatures above the QCD phase transition the lack of supersymmetry is of minor importance and effects caused by the other differences can be described perturbatively, either on the QCD or gravity side of the duality.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric shockwave collisions in AdS5

Waeber

Rabenstein

Schäfer

et al. 2019

J. High Energ. Phys.

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Collisions of asymmetric planar shocks in maximally supersymmetric Yang-Mills theory are studied via their dual gravitational formulation in asymptotically antide Sitter spacetime. The post-collision hydrodynamic flow is found to be very well described by appropriate means of the results of symmetric shock collisions. This study extends, to asymmetric collisions, previous work of Chesler, Kilbertus, and van der Schee examining the special case of symmetric collisions [1]. Given the universal description of hydrodynamic flow produced by asymmetric planar collisions one can model, quantitatively, non-planar, non-central collisions of highly Lorentz contracted projectiles without the need for computing, holographically, collisions of finite size projectiles with very large aspect ratios. This paper also contains a pedagogical description of the computational methods and software used to compute shockwave collisions using pseudo-spectral methods, supplementing the earlier overview of Chesler and Yaffe [2].

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Section: Introductionmentioning

confidence: 99%

Asymmetric shockwave collisions in AdS5

Waeber

Rabenstein

Schäfer

et al. 2019

J. High Energ. Phys.

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“…This was later extended to studies of a gauge theory in flat space-time, prepared with a wide variety of initial states [38][39][40][41], which always led to hydrodynamics within t < 1.2/T . Lastly, many studies have been performed in colliding settings, mimicking heavy-ion collisions more closely both in the longitudinal and transverse directions [40,[42][43][44][45][46], even allowing for direct comparison with experimental data [47,48].…”

Section: Jhep04(2016)031mentioning

confidence: 99%

Weak and strong coupling equilibration in nonabelian gauge theories

Keegan

Kurkela

Romatschke

et al. 2016

J. High Energ. Phys.

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112

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We present a direct comparison studying equilibration through kinetic theory at weak coupling and through holography at strong coupling in the same set-up. The set-up starts with a homogeneous thermal state, which then smoothly transitions through an outof-equilibrium phase to an expanding system undergoing boost-invariant flow. This first apples-to-apples comparison of equilibration provides a benchmark for similar equilibration processes in heavy-ion collisions, where the equilibration mechanism is still under debate. We find that results at weak and strong coupling can be smoothly connected by simple, empirical power-laws for the viscosity, equilibration time and entropy production of the system.

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“…We would also like to point out that this evidence is not conclusive for the existence of quark-gluon plasma and in fact there is the observation that the 4-particle cumulant, called c 2 (4) , can have a positive sign for systems with low multiplicity, although this depends somewhat on the method used [32]. This is thought to be incompatible with a standard hydrodynamic + freeze-out prescription.…”

Section: Small Systemsmentioning

confidence: 83%

“…The work in this section was done in collaboration with Jorge Casalderrey-Solana, Paul Chesler, Michal Heller, Niki Kilbertus, David Mateos, Bjorn Schenke and Miqual Triana, as presented in [2][3][4][5].…”

Section: Fast Hydrodynamisation and A Gaussian Rapidity Profilementioning

confidence: 99%

Early hydrodynamisation, energy loss and small systems in holographic heavy ion collisions

Schee

2017

EPJ Web Conf.

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Abstract. There has been much recent progress in describing heavy ion collisions using strongly coupled methods. We start by introducing a few caveats in applying holography to QCD, after which we will highlight recent progress on the initial stage, by simulating shock collisions in the dual gravitational theory. Secondly, we describe an attempt at describing jet evolution through strongly coupled plasma, where we specifically also included the width of the jet, and the interplay of this width with the energy lost as the jet propagates through the plasma. Lastly, there has been much recent discussion about the formation of quark-gluon plasma in small systems at low multiplicies, such as produced in proton-nucleus or even proton-proton collisions. At infinitely strong coupling it is possible to estimate that this may be possible, provided that the particle multiplicity satisfies dN tot /dy 4. OutlineCare must always be taken when interpreting results from holography in relation to heavy ion collisions. Especially around the QCD confinement/deconfinement transition pure N = 4 SYM is different from QCD, although much progress can be made by considering more realistic holographic models including a running of the coupling constant and a confinement/deconfinement transition [1] . At high energy scales a direct comparison is also complicated, since asymptotic freedom implies that the coupling becomes weak at (very) high energies. The coupling, however, runs only logarithmically with energy, and hence at LHC energy scales there is always a need of including some strongly coupled physics.It is hence a sensible approach to model heavy ion collisions at weak coupling, using perturbative QCD, as well as to model the collisions at strong coupling, using holography. Combining insights from both approaches can then lead to a realistic understanding of heavy ion collisions. Here, we will give a recent overview of holographic attempts to describe the initial stage as well as the propagation of jets. Lastly, we comment on recent excitement where flow-like signals were observed in small systems at relatively low multiplicities. a

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Rapidity dependence in holographic heavy ion collisions

Cited by 24 publications

References 49 publications

Asymmetric shockwave collisions in AdS5

Asymmetric shockwave collisions in AdS5

Weak and strong coupling equilibration in nonabelian gauge theories

Early hydrodynamisation, energy loss and small systems in holographic heavy ion collisions

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