Speaker
Koichi Murase
(The University of Tokyo)
Description
Thermal fluctuations arising during hydrodynamic evolution of
the system (a.k.a., *hydrodynamic fluctuations*) [1] play an important role
in event-by-event hydrodynamic simulations. For example, entropy
production fluctuates during the expansion even if we start from a common
initial condition in a macroscopic sense [2]. On the other hand, the
effect of the fluctuations must be significant in small colliding systems
such as p-p, p-A and peripheral A-A collisions [2]. Stability of thermal
equilibrium systems is a consequence of an interplay between thermal
fluctuations and dissipation. Thus it is indispensable to take the
hydrodynamic fluctuations into account in causal dissipative hydrodynamic
simulations.
In this study, we develop a new (next-generation) integrated dynamical
model to investigate the effects of the hydrodynamic fluctuations on
observables in high-energy nuclear collisions. We implement the
hydrodynamic fluctuations in a fully 3-D dynamical model consisting of
the hydrodynamic initialization models such as Monte-Carlo
Kharzeev-Levin-Nardi model and Monte-Carlo Glauber model, causal
dissipative hydrodynamics, and the subsequent hadronic cascades. By
analyzing the hadron distributions obtained by massive event-by-event
simulations with both of the hydrodynamic fluctuations and the
initial-state fluctuations, we discuss the effects of the hydrodynamic
fluctuations on the flow harmonics, $v_n$, and their fluctuations. This
sheds a new light on extracting transport coefficients from observables.
* [1] K. Murase and T. Hirano, arXiv:1304.3243 [nucl-th].
* [2] T. Hirano, R. Kurita, K. Murase and K. Nagai, Nucl. Phys. A **931**
(2014) 831.
| On behalf of collaboration: | NONE |
|---|
Primary authors
Koichi Murase
(The University of Tokyo)
Tetsufumi Hirano
(Sophia Univ)
