Hydrodynamics from Landau initial conditions

37th Brazilian Meeting on Nuclear Physics

Sen, Abhisek^1 ; Gerhard, Jochen^2 ; Torrieri, Giorgio^3 ; Read, Kenneth^1,4 ; Wong, Cheuk-Yin^4

University of Tennessee, Knoxville

TN

37996, United States^1

Frankfurt Institute for Advanced Studies (FIAS), Frankfurt am Main, Germany^2

IFGW, Universidade Estadual de Campinas, São Paulo, Campinas, Brazil^3

Oak Ridge National Laboratory, Oak Ridge

TN

37831, United States^4

关键词: Heavy ion collision;    Inhomogeneities;    Initial conditions;    Quark-gluon plasma;    Semi-analytical;    Transport coefficient;    Transverse density;    Transverse flow;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/630/1/012042/pdf
DOI  :  10.1088/1742-6596/630/1/012042

来源: IOP

【 摘 要 】

We investigate ideal hydrodynamic evolution, with Landau initial conditions, both in a semi-analytical 1+1D approach and in a numerical code incorporating event-by event variation with many events and transverse density inhomogeneities. The object of the calculation is to test how fast would a Landau initial condition transition to a commonly used boost-invariant expansion. We show that the transition to boost-invariant flow occurs too late for realistic setups, with corrections of O (20 - 30%) expected at freeze out for most scenarios. Moreover, the deviation from boost-invariance is correlated with both transverse flow and elliptic flow, with the more highly transversely flowing regions also showing the most violation of boost invariance. Therefore, if longitudinal flow is not fully developed at the early stages of heavy ion collisions, 2+1 dimensional hydrodynamics is inadequate to extract transport coefficients of the quark-gluon plasma. Based on [1, 2]