HBT and initial conditions for hydrodynamic expansion in A+A collisions

Gyulassy, Miklós; Karpenko, Iu.; Nazarenko, A. V.; Sinyukov, Yu. M.

doi:10.1590/s0103-97332007000600021

Cited by 42 publications

(49 citation statements)

References 13 publications

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“…The reason is that there are two oppositely directed factors which act simultaneously to the transverse gradient of the hydrodynamic pressure that contributes to formation of are larger during the relaxation process when λ is larger. In its turn the transverse gradient of particle or/and energy densities define the transverse flow at free streaming process [21,25]: It grows when the gradient increases.…”

Section: Resultsmentioning

confidence: 99%

Initialization of hydrodynamics in relativistic heavy ion collisions with an energy-momentum transport model

et al. 2015

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A key ingredient of hydrodynamical modeling of relativistic heavy ion collisions is thermal initial conditions, an input that is the consequence of a prethermal dynamics which is not completely understood yet. In the paper we employ a recently developed energy-momentum transport model of the prethermal stage to study influence of the alternative initial states in nucleus-nucleus collisions on flow and energy density distributions of the matter at the starting time of hydrodynamics. In particular, the dependence of the results on isotropic and anisotropic initial states is analyzed. It is found that at the thermalization time the transverse flow is larger and the maximal energy density is higher for the longitudinally squeezed initial momentum distributions. The results are also sensitive to the relaxation time parameter, equation of state at the thermalization time, and transverse profile of initial energy density distribution: Gaussian approximation, Glauber Monte Carlo profiles, etc. Also, test results ensure that the numerical code based on the energy-momentum transport model is capable of providing both averaged and fluctuating initial conditions for the hydrodynamic simulations of relativistic nuclear collisions.

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Section: Resultsmentioning

confidence: 99%

Initialization of hydrodynamics in relativistic heavy ion collisions with an energy-momentum transport model

et al. 2015

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“…[26] we have argued that the ignition of hydrodynamics may be delayed to comfortably later times of about 1 fm, if it is preceded with particle free-streaming starting at 0.25 fm followed by a sudden equilibration. This approximation has been proposed by Kolb, Sollfrank, and Heinz [55] and elaborated further in the context of the early development of flow by Sinyukov, Gyulassy, Karpenko, and Nazarenko [56,57]. The approach assumes that after the formation the partons are first free streaming and later, around the proper time of 1 fm, undergo a sudden equilibration described in terms of the Landau matching condition.…”

Section: B Hydrodynamicsmentioning

confidence: 99%

Azimuthally sensitive femtoscopy in hydrodynamics with statistical hadronization from the BNL Relativistic Heavy Ion Collider to the CERN Large Hadron Collider

et al. 2009

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Azimuthally sensitive femtoscopy for heavy-ion collisions at the Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC) is explored within the approach consisting of the hydrodynamics of perfect fluid followed by statistical hadronization. It is found that for the RHIC initial conditions, employing the Gaussian shape of the initial energy density, the very same framework that reproduces the standard soft observables [including the transverse-momentum spectra, the elliptic flow, and the azimuthally averaged Hanbury-Brown-Twiss (HBT) radii] leads to a proper description of the azimuthally sensitive femtoscopic observables; we find that the azimuthal variation of the side and out HBT radii as well as out-side cross term are very well reproduced for all centralities. Concerning the dependence of the femtoscopic parameters on k T we find that it is very well reproduced. The model is then extrapolated to the LHC energy. We predict the overall moderate growth of the HBT radii and the decrease of their azimuthal oscillations. Such effects are naturally caused by longer evolution times. In addition, we discuss in detail the space-time patterns of particle emission. We show that they are quite complex and argue that the overall shape seen by the femtoscopic methods cannot be easily disentangled on the basis of simple-minded arguments.

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“…The results obtained in this model do not agree with the data, but might be used as an initial condition for hydrodynamic calculations. Another interesting attempt [44] (see also similar ideas in an earlier paper [45]) to obtain the initial flow field is via the so called "Landau matching condition" for the energy momentum tensor, assuming initial free streaming of partons with rapid thermalization at times of about one fermi. The possibility for such initial flow in particular allows one to start the hydrodynamic evolution at realistic times of about one fermi, and not loose the ability to reproduce large elliptic flow.…”

Section: Generalmentioning

confidence: 99%

Collective Phenomena in Non-Central Nuclear Collisions

Voloshin¹,

Poskanzer²,

Snellings³

2010

Relativistic Heavy Ion Physics

289

408

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HBT and initial conditions for hydrodynamic expansion in A+A collisions

Abstract: The behavior of interferometry radii in central A+A collisions at different energies and also for different nuclei or impact parameters indicates initial transverse flow at a very early stage of the matter evolution. Development of such flow at the pre-thermal partonic stage is considered.

Cited by 42 publications

References 13 publications

Initialization of hydrodynamics in relativistic heavy ion collisions with an energy-momentum transport model

Initialization of hydrodynamics in relativistic heavy ion collisions with an energy-momentum transport model

Azimuthally sensitive femtoscopy in hydrodynamics with statistical hadronization from the BNL Relativistic Heavy Ion Collider to the CERN Large Hadron Collider

Collective Phenomena in Non-Central Nuclear Collisions

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