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Prehydrodynamic evolution and its signatures in final-state heavy-ion observables

Journal Article · · Physical Review. C
 [1];  [2];  [3];  [4];  [5];  [6];  [2];  [2]
  1. Universidade Federal de Santa Catarina, Florianópolis (Brazil); University of Illinois at Urbana-Champaign
  2. Universidade Estadual de Campinas, Campinas (Brazil). Instituto de Física Gleb Wataghin
  3. Universidade Federal Fluminense, Niterói (Brazil). Instituto de Física
  4. Universidade Estadual de Campinas, Campinas (Brazil). Instituto de Física Gleb Wataghin; Univ. of Illinois at Urbana-Champaign, IL (United States). Illinois Center for Advanced Studies of the Universe
  5. Universidade de São Paulo, São Paulo (Brazil). Instituto de Física
  6. Univ. of Illinois at Urbana-Champaign, IL (United States). Illinois Center for Advanced Studies of the Universe
We investigate the effects of prehydrodynamic evolution on final-state observables in heavy-ion collisions using state-of-the art event simulations coupled to different prehydrodynamic scenarios, which include the recently developed effective kinetic transport theory evolution model KøMPøST. Differential flow observables are found to be mostly insensitive to the details of prehydrodynamic evolution. The main effect we observe is in the pT spectra, particularly the mean transverse momentum. However, at least part of this effect is a consequence of the underlying conformal invariance assumption currently present in such approaches, which is known to be violated in the temperature regime probed in heavy-ion collisions. This assumption of early time conformal invariance leads to an artificially large out-of-equilibrium bulk pressure when switching from (conformal) prehydrodynamic evolution to hydrodynamics (using the nonconformal QCD equation of state), which in turn increases the transverse momentum. Our study indicates that a consistent treatment of prehydrodynamic evolution in heavy-ion collisions requires the use of nonconformal models of early time dynamics.
Research Organization:
University of Illinois at Urbana-Champaign, Urbana, IL (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
ExTrEMe Collaboration
Grant/Contract Number:
SC0021301
OSTI ID:
1785325
Alternate ID(s):
OSTI ID: 2283568
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 5 Vol. 103; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (87)

Subleading harmonic flows in hydrodynamic simulations of heavy ion collisions journal April 2015
Flow analysis with cumulants: direct calculations text January 2010
Fluctuating Glasma initial conditions and flow in heavy ion collisions text January 2012
Quasiparticle equation of state for anisotropic hydrodynamics text January 2015
Hydrodynamization and non-equilibrium Green's functions in kinetic theory text January 2020
Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at s N N = 5.02 $$ \sqrt{s_{\mathrm{NN}}}=5.02 $$ and 2.76 TeV journal July 2018
Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC journal September 2010
Nonstationary irreversible thermodynamics: A causal relativistic theory journal September 1976
Transient relativistic thermodynamics and kinetic theory journal April 1979
Quark-gluon plasma and hadronic production of leptons, photons and psions journal September 1978
Microscopic models for ultrarelativistic heavy ion collisions journal January 1998
THERMINATOR 2: THERMal heavy IoN generATOR 2 journal March 2012
The iEBE-VISHNU code package for relativistic heavy-ion collisions journal February 2016
Quark–gluon plasma and color glass condensate at RHIC? The perspective from the BRAHMS experiment journal August 2005
The PHOBOS perspective on discoveries at RHIC journal August 2005
Experimental and theoretical challenges in the search for the quark–gluon plasma: The STAR Collaboration's critical assessment of the evidence from RHIC collisions journal August 2005
Formation of dense partonic matter in relativistic nucleus–nucleus collisions at RHIC: Experimental evaluation by the PHENIX Collaboration journal August 2005
Parton–hadron–string dynamics: An off-shell transport approach for relativistic energies journal December 2009
QCD equation of state and hadron resonance gas journal June 2010
SMASH – A new hadronic transport approach journal February 2019
Probing Early-Time Dynamics and Quark-Gluon Plasma Transport Properties with Photons and Hadrons journal January 2021
Long-range angular correlations on the near and away side in p–Pb collisions at sNN=5.02 TeV journal February 2013
One fluid to rule them all: Viscous hydrodynamic description of event-by-event central p+p, p+Pb and Pb+Pb collisions at s = 5.02 TeV journal November 2017
The QCD equation of state from the lattice journal May 2013
An overview of experimental results from ultra-relativistic heavy-ion collisions at the CERN LHC: Bulk properties and dynamical evolution journal November 2016
Relativistic Fluid Dynamics in and out of Equilibrium book January 2019
Bayesian estimation of the specific shear and bulk viscosity of quark–gluon plasma journal August 2019
Evidence for quark-matter cores in massive neutron stars journal June 2020
Relativistic hadron-hadron collisions in the ultra-relativistic quantum molecular dynamics model journal September 1999
Effective kinetic theory for high temperature gauge theories journal January 2003
New theories of relativistic hydrodynamics in the LHC era journal February 2018
Measuring momentum-dependent flow fluctuations in heavy-ion collisions journal March 2020
Multiphase transport model for relativistic nuclear collisions journal May 2000
Flow analysis from multiparticle azimuthal correlations journal September 2001
Initial condition for quark-gluon plasma evolution journal April 2002
Thermalization of gluons in ultrarelativistic heavy ion collisions by including three-body interactions in a parton cascade journal June 2005
Multiphase transport model for relativistic heavy ion collisions journal December 2005
Parton ladder splitting and the rapidity dependence of transverse momentum spectra in deuteron-gold collisions at the BNL Relativistic Heavy Ion Collider journal October 2006
Transport rates and momentum isotropization of gluon matter in ultrarelativistic heavy-ion collisions journal August 2007
Causal viscous hydrodynamics in 2 + 1 dimensions for relativistic heavy-ion collisions journal June 2008
Parton transport and hadronization from the dynamical quasiparticle point of view journal September 2008
Fully integrated transport approach to heavy ion reactions with an intermediate hydrodynamic stage journal October 2008
Free-streaming approximation in early dynamics of relativistic heavy-ion collisions journal September 2009
(3+1)D hydrodynamic simulation of relativistic heavy-ion collisions journal July 2010
Coupling relativistic viscous hydrodynamics to Boltzmann descriptions journal October 2010
Flow analysis with cumulants: Direct calculations journal April 2011
Higher flow harmonics from ( 3 + 1 ) D event-by-event viscous hydrodynamics journal February 2012
Event-by-event gluon multiplicity, energy density, and eccentricities in ultrarelativistic heavy-ion collisions journal September 2012
Bulk viscosity effects in event-by-event relativistic hydrodynamics journal October 2013
Accounting for backflow in hydrodynamic-Boltzmann interfaces journal February 2014
Bulk viscosity-driven suppression of shear viscosity effects on the flow harmonics at energies available at the BNL Relativistic Heavy Ion Collider journal September 2014
Subleading harmonic flows in hydrodynamic simulations of heavy ion collisions journal April 2015
Pre-equilibrium evolution effects on heavy-ion collision observables journal June 2015
Alternative ansatz to wounded nucleon and binary collision scaling in high-energy nuclear collisions journal July 2015
Quasiparticle equation of state for anisotropic hydrodynamics journal November 2015
Fluctuations of harmonic and radial flow in heavy ion collisions with principal components journal February 2016
Production of photons in relativistic heavy-ion collisions journal April 2016
Applying Bayesian parameter estimation to relativistic heavy-ion collisions: Simultaneous characterization of the initial state and quark-gluon plasma medium journal August 2016
Particle production and equilibrium properties within a new hadron transport approach for heavy-ion collisions journal November 2016
Effect of the QCD equation of state and strange hadronic resonances on multiparticle correlations in heavy ion collisions journal September 2018
Effective kinetic description of event-by-event pre-equilibrium dynamics in high-energy heavy-ion collisions journal March 2019
Single-particle distribution in the hydrodynamic and statistical thermodynamic models of multiparticle production journal July 1974
Hydrodynamization and nonequilibrium Green’s functions in kinetic theory journal September 2020
Highly relativistic nucleus-nucleus collisions: The central rapidity region journal January 1983
Computing quark and gluon distribution functions for very large nuclei journal March 1994
Equation of state and QCD transition at finite temperature journal July 2009
Constraining the hadronic spectrum through QCD thermodynamics on the lattice journal August 2017
Centrality Dependence of the Charged-Particle Multiplicity Density at Midrapidity in Pb-Pb Collisions at s NN = 2.76     TeV journal January 2011
Fluctuating Glasma Initial Conditions and Flow in Heavy Ion Collisions journal June 2012
Principal Component Analysis of Event-by-Event Fluctuations journal April 2015
Importance of the Bulk Viscosity of QCD in Ultrarelativistic Heavy-Ion Collisions journal September 2015
Matching the Nonequilibrium Initial Stage of Heavy Ion Collisions to Hydrodynamics with QCD Kinetic Theory journal March 2019
Hydrodynamic Attractors, Initial State Energy, and Particle Production in Relativistic Nuclear Collisions journal December 2019
Ultraviolet Behavior of Non-Abelian Gauge Theories journal June 1973
Reliable Perturbative Results for Strong Interactions? journal June 1973
Superdense Matter: Neutrons or Asymptotically Free Quarks? journal May 1975
Erratum: Pre-equilibrium evolution effects on heavy-ion collision observables [Phys. Rev. C 91 , 064906 (2015)] journal October 2015
Particlization in hybrid models journal November 2012
Causal viscous hydrodynamics for central heavy-ion collisions journal May 2007
Light-heavy-ion collisions: a window into pre-equilibrium QCD dynamics? journal July 2015
Fast resonance decays in nuclear collisions journal March 2019
Collective Flow and Viscosity in Relativistic Heavy-Ion Collisions journal October 2013
First Results from Pb+Pb Collisions at the LHC journal November 2012
Glauber Modeling in High-Energy Nuclear Collisions journal November 2007
The iEBE-VISHNU code package for relativistic heavy-ion collisions dataset January 2019
The iEBE-VISHNU code package for relativistic heavy-ion collisions dataset January 2019
Testing a Best-Fit Hydrodynamical Model Using PCA journal January 2019

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