v-USPhydro: Bulk Viscosity Effects on Event-by-Event Relativistic Hydrodynamics

29th Winter Workshop on Nuclear Dynamics

Noronha-Hostler, Jacquelyn^1 ; Denicol, Gabriel S.^2 ; Noronha, Jorge^1 ; Andrade, Rone P. G.^1 ; Grassi, Frédérique^1

Instituto de Física, Universidade de São Paulo, C.P. 66318, 05315-970 São Paulo, SP, Brazil^1

Department of Physics, McGill University, 3600 University Street, Montreal, QC H3A 2T8, Canada^2

关键词: Bulk viscosity;    Collective flow;    Entropy density;    Fourier harmonics;    Heavy ion collision;    Lagrangian hydrodynamics;    Relativistic hydrodynamics;    Smoothed particle hydrodynamics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/458/1/012018/pdf
DOI  :  10.1088/1742-6596/458/1/012018

来源: IOP

【 摘 要 】

v-USPhydro is a new relativistic 2+1 Lagrangian hydrodynamic code that incorporates the effects of bulk viscous hydrodynamics using Smoothed Particle Hydrodynamics (SPH) and is applicable to heavy ion collisions. Within this framework the bulk viscosity effects on collective flow harmonics i.e. v2-v5 are studied on an event-by-event basis. We discuss which corrections to the Cooper Frye model are most appropriate when bulk viscosity is considered. An enhancement of all the Fourier harmonics is seen when bulk viscosity correction to the Cooper Frye is considered even when the bulk viscosity to entropy density ratio, ζ/s, is significantly smaller than 1/(4π).