Statistical analysis of initial-state and final-state response in heavy-ion collisions

Borghini, Nicolas; Borrell, Marc; Feld, Steffen; Roch, Hendrik; Schlichting, Sören; Werthmann, Clemens

doi:10.1103/physrevc.107.034905

Cited by 15 publications

(7 citation statements)

References 81 publications

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“…Further investigation into the exact character of the strangeness geometry is needed, particularly as to its connection to the hot spots of the medium. Recent advancements have been made in describing the initial state through a decomposition of the initial density into an average state and a basis of modes [328]. Applying this method to the new conserved charge densities produced by iccing could provide useful information as to the source of the difference between the strange and other event geometries.…”

Section: Discussionmentioning

confidence: 99%

“…This approach offers a powerful method for computing T µν (x) as numerical simulations only need to be performed once to obtain the background evolution and the Green's functions. Over the past few years, various groups have integrated KøMPøST into their fluid dynamics simulations, establishing direct connections with experimental data [235], [327], [328].…”

Section: Chargesmentioning

confidence: 99%

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Monte Carlo event generator for initial conditions of conserved charges in nuclear geometry

et al. 2022

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At top collider energies where baryon stopping is negligible, the initial state of heavy ion collisions is overall charge neutral and predominantly composed of gluons. Nevertheless, there can also be significant local fluctuations of the baryon number, strangeness, and electric charge densities about zero, perturbatively corresponding to the production of quark/antiquark pairs. These previously ignored local charge fluctuations can permit the study of charge diffusion in the quark-gluon plasma (QGP), even at top collider energies. In this paper we present a new model denoted iccing (Initial Conserved Charges in Nuclear Geometry) which can reconstruct the initial conditions of conserved charges in the QGP by sampling a (g → q q) splitting probability over the initial energy density. We find that the new charge distributions generally differ from the bulk energy density; in particular, the strangeness distribution is significantly more eccentric than standard bulk observables and appears to be associated with the geometry of hot spots in the initial state. The new information provided by these conserved charges opens the door to studying a wealth of new charge-and flavor-dependent correlations in the initial state and ultimately the charge transport parameters of the QGP.

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Section: Discussionmentioning

confidence: 99%

Section: Chargesmentioning

confidence: 99%

Monte Carlo event generator for initial conditions of conserved charges in nuclear geometry

et al. 2022

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“…For the pionic medium considered at T 50 MeV with µ Q = 0 − 100 MeV and for typical values of relaxation time τ c 15 fm [67,68], [6] For various modes of energy density fluctuations in the transverse plane of the colliding system, see also Ref. [65]. [7] At a non-zero µ Q , the effects of magnetic field on the evolution of fluctuations become explicit.…”

Section: Simulation Detailsmentioning

confidence: 99%

Effects of magnetic field on the evolution of energy density fluctuations

Dave¹,

Pal²

2023

Preprint

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We study the effects of a static and uniform magnetic field on the evolution of energy density fluctuations present in a medium. By numerically solving the relativistic Boltzmann-Vlasov equation within the relaxation time approximation, we explicitly show that magnetic field can affect the characteristics of energy density fluctuations at the timescale the system achieves local thermodynamic equilibrium. A detailed momentum mode analysis of fluctuations reveals that magnetic field increases the damping of mode oscillations, especially for the low momentum modes. This leads to a reduction in the ultraviolet (high momentum) cutoff of fluctuations and also slows down the dissipation of relatively low momentum fluctuation modes. We discuss the phenomenological implications of our study on various sources of fluctuations in relativistic heavy-ion collisions.

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“…Our initial condition was obtained as an average over events from the 30 − 40% centrality class of Pb+Pb collisions at 5.02 TeV (see [5] for details). This fixes 𝑅 and d𝐸 (0) ⊥ d𝜂 , so we vary the opacity via 𝜂 𝑠 .…”

Section: Kinetic Theorymentioning

confidence: 99%

Opacity dependence of transverse flow, preequilibrium, and applicability of hydrodynamics in heavy-ion collisions

2023

Self Cite

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We simulate the space-time dynamics of high-energy collisions based on a microscopic kinetic description, in order to determine the range of applicability of an effective description in relativistic viscous hydrodynamics. We find that hydrodynamics provides a quantitatively accurate description of collective flow when the average inverse Reynolds number Re −1 is sufficiently small and the early pre-equilibrium stage is properly accounted for. By determining the breakdown of hydrodynamics as a function of system size and energy, we find that it is quantitatively accurate in central lead-lead collisions at LHC energies, but should not be used in typical proton-lead or protonproton collisions, where the development of collective flow can not accurately be described within hydrodynamics.

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Statistical analysis of initial-state and final-state response in heavy-ion collisions

Cited by 15 publications

References 81 publications

Monte Carlo event generator for initial conditions of conserved charges in nuclear geometry

Monte Carlo event generator for initial conditions of conserved charges in nuclear geometry

Effects of magnetic field on the evolution of energy density fluctuations

Opacity dependence of transverse flow, preequilibrium, and applicability of hydrodynamics in heavy-ion collisions

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