Multiplicities from black-hole formation in heavy-ion collisions

Kiritsis, Elias; Taliotis, Anastasios

doi:10.1007/jhep04(2012)065

Cited by 47 publications

(59 citation statements)

References 64 publications

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“…Thermalization in the improved holographic background has been studied in [32] and it has been shown that without additional assumptions, such as an energy dependent cut-off at the high energy [28], one cannot reproduce the multiplicity dependence on energy observed at RHIC and LHC in this background. In [33] it has been noticed that the holographic realization of the experimental dependence of multiplicity on the energy [35] requires an unstable background.…”

Section: Introductionmentioning

confidence: 99%

Formation time of quark–gluon plasma in heavy-ion collisions in the holographic shock wave model

Aref’eva

2015

Theor Math Phys

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Abstract:We estimate the thermalization time in two colliding shock waves holographic model of heavy-ion collisions. For this purpose we model the process by the Vaidya metric with a horizon defined by the trapped surface location. We consider two bottom-up AdS/QCD models that give, within the colliding shock waves approach, the dependence of multiplicity on the energy compatible with RHIC and LHC results. One model is a bottom-up AdS/QCD confining model and the other is related to an anisotropic thermalization. We estimate the thermalization time and show that increasing the confining potential decreases the thermalization time as well as an anisotropy accelerates the thermalization.

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Section: Introductionmentioning

confidence: 99%

Formation time of quark–gluon plasma in heavy-ion collisions in the holographic shock wave model

Aref’eva

2015

Theor Math Phys

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“…This critical value depends on the energy of colliding particles and the value of a cosmological constant. The formation of TSs in head-on collisions of shock waves in gravitational theories with more complicated bulk dynamics, in particular, with the Einstein-dilaton dynamics, claimed to describe a holographic physics that is closer to QCD than the purely AdS theory [33,36,37], was recently considered by Kiritsis and Taliotis [38], 1 who found that the multiplicity increases as…”

Section: Jhep05(2012)117mentioning

confidence: 99%

“…It was proposed in [28] to solve this problem by removing a UV part of the AdS bulk. Shock waves corresponding to the BH with a nonzero dilaton field [36,37] were considered in [38], where it was shown that the lower bound on N ch scales is closer to s 1/4 N N .…”

Section: Jhep05(2012)117mentioning

confidence: 99%

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Holographic phase diagram of quark-gluon plasma formed in heavy-ion collisions

Aref’eva

Bagrov

Pozdeeva

2012

J. High Energ. Phys.

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We use a holographic dual model for the heavy-ion collision to obtain the phase diagram of the quark-gluon plasma (QGP) formed at a very early stage just after the collision. In this dual model, colliding ions are described by the charged gravitational shock waves. Points on the phase diagram correspond to the QGP or hadronic matter with given temperatures and chemical potentials. The phase of the QGP in dual terms is related to the case where the collision of shock waves leads to the formation of a trapped surface. Hadronic matter and other confined states correspond to the absence of a trapped surface after collision. In the dual language, the multiplicity of the ion collision process is estimated as the area of the trapped surface. We show that a nonzero chemical potential reduces the multiplicity. To plot the phase diagram, we use two different dual models of colliding ions, the pointlike and the wall shock waves, and find that the results agree qualitatively.

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“…The issue was studied by implementing various approaches in the literature. In [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] the collisions of gravitational shock waves are introduced to mimic the colliding nuclei in the relativistic collisions. In [24,25] time-dependent and boost-invariant metrics, associated with the plasma undergoing Bjorken expansion, were investigated and further generalized in [26] with a chemical potential.…”

Section: Introductionmentioning

confidence: 99%

Jet quenching and holographic thermalization with a chemical potential

Cáceres

Kundu

Yang

2014

J. High Energ. Phys.

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Abstract:We investigate jet quenching of virtual gluons and thermalization of a stronglycoupled plasma with a non-zero chemical potential via the gauge/gravity duality. By tracking a charged shell falling in an asymptotic AdS d+1 background for d = 3 and d = 4, which is characterized by the AdS-Reissner-Nordström-Vaidya (AdS-RN-Vaidya) geometry, we extract a thermalization time of the medium with a non-zero chemical potential. In addition, we study the falling string as the holographic dual of a virtual gluon in the AdS-RN-Vaidya spacetime. The stopping distance of the massless particle representing the tip of the falling string in such a spacetime could reveal the jet quenching of an energetic light probe traversing the medium in the presence of a chemical potential. We find that the stopping distance decreases when the chemical potential is increased in both AdS-RN and AdS-RN-Vaidya spacetimes, which correspond to the thermalized and thermalizing media respectively. Moreover, we find that the soft gluon with an energy comparable to the thermalization temperature and chemical potential in the medium travels further in the non-equilibrium plasma. The thermalization time obtained here by tracking a falling charged shell does not exhibit, generically, the same qualitative features as the one obtained studying non-local observables. This indicates that -holographically -the definition of thermalization time is observer dependent and there is no unambiguos definition.

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Multiplicities from black-hole formation in heavy-ion collisions

Cited by 47 publications

References 64 publications

Formation time of quark–gluon plasma in heavy-ion collisions in the holographic shock wave model

Formation time of quark–gluon plasma in heavy-ion collisions in the holographic shock wave model

Holographic phase diagram of quark-gluon plasma formed in heavy-ion collisions

Jet quenching and holographic thermalization with a chemical potential

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