Coarse Graining in Hydrodynamics and Effects of Fluctuations

14th International Conference on Strangeness in Quark Matter

Kodama, T.^1 ; Koide, T.^1

Instituto de Fisica, Universidade Federal Do Rio de Janeiro, C.P. 68528, 21941-972 Rio de Janeiro, Brazil^1

关键词: Coarse Graining;    Collective flow;    Heavy ion collision;    Local thermal equilibrium;    Physical meanings;    Statistical ensembles;    Variational formulation;    Variational methods;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/509/1/012016/pdf
DOI  :  10.1088/1742-6596/509/1/012016

来源: IOP

【 摘 要 】

We address the physical meaning of coarse graining scale and the hidden statistical ensemble in event by event analysis in hydrodynamic approach to heavy-ion collisions. It is shown that these features are appropriately understood in the frame work of variational formulation and pointed out that the local thermal equilibrium does not necessarily play a critical role in the description of the collective flow patterns. We further discuss that the effect of viscosity is also formlated in the form of the variational method including fluctuations.