Review

The European Physical Journal A

, 48:165

Coarse-graining scale and effectiveness of hydrodynamic modeling

  • Ph. MotaAffiliated withInstituto de Física, Universidade Federal do Rio de JaneiroFrankfurt Institute for Advanced Studies FIAS, Goethe-Universität Frankfurt
  • , T. KodamaAffiliated withInstituto de Física, Universidade Federal do Rio de JaneiroFrankfurt Institute for Advanced Studies FIAS, Goethe-Universität FrankfurtExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung
  • , R. Derradi de SouzaAffiliated withInstituto de Física Gleb Wataghin, Universidade Estadual de Campinas
  • , J. TakahashiAffiliated withInstituto de Física Gleb Wataghin, Universidade Estadual de Campinas

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Abstract

Some basic questions about the hydrodynamical approach to relativistic heavy-ion collisions are discussed aiming to clarify how far we can go with such an approach to extract useful information on the properties and dynamics of the QCD matter created. We emphasize the importance of the coarse-graining scale required for the hydrodynamic modeling which determines the space-time resolution and the associated limitations of collective flow observables. We show that certain kinds of observables can indicate the degree of inhomogeneity of the initial condition under less stringent condition than the local thermal equilibrium subjected to the coarse-graining scale compatible to the scenario.