Speaker
Salvatore Plumari
(University of Catania (Italy))
Description
We discuss the generation of anisotropic flows $v_n$ for a fluid at fixed $\eta/s(T)$ by means of an
event-by-event transport approach. Such an approach, as shown in [1], recovers the universal features
of the ideal hydrodynamics showing an agreement with the recent analitical solutions.
We discuss the effect of the $\eta/s$ and its temperature dependence on the
build up of the $v_n(p_T)$ revealing that only in ultra-central collisions ($0-0.2\%$) the $v_n(p_T)$ have a stronger sensitivity to the T dependence of $\eta/s$ in the QGP phase and this sensitivity increases with
the order of the harmonic n.
Moreover, the study of the correlations between the initial spatial anisotropies $\epsilon_n$ and the final
flow coefficients $v_n$ shows that at LHC energies there is more correlation than at RHIC energies.
The degree of correlation increases from peripheral to central collisions, but only in ultra-central
collisions at LHC, we find that the linear correlation coefficent $C(n,n) \approx 1$ for $n=2,3,4$ and $5$. This suggests that
the final correlations in the ($v_n$,$v_m$) space reflect the initial correlations in the ($\epsilon_n$,$\epsilon_m$) space.
Moreover the recent event shape engineering (ESE) [4] tecnique allows to have a new insight into the initial state fluctuations and $\epsilon_n$ correlations [5].
Finally, we discuss in ultra-central collisions the structure of the integrated ($v_n,n$) plot and its relation with the
kinetic freeze out dynamics.
[1] S. Plumari, G. L. Guardo, V. Greco and J.-Y. Ollitrault, Nucl.Phys. A 941 (2015) 87.
[2] S. Plumari, G. L. Guardo, A. Puglisi, F. Scardina and V. Greco, J.Phys.Conf.Ser. 535 (2014) 012013.
[3] S. Plumari, A. Puglisi, F. Scardina and V. Greco, Phys.Rev. C86 (2012) 054902.
[4] J. Schukraft, A. Timmins and S. A. Voloshin,
Phys. Lett. B 719 (2013) 394.
[5] S. Plumari, F. Scardina and V. Greco, to be submitted.
| On behalf of collaboration: | NONE |
|---|
Author
Vincenzo Greco
(University of Catania)
Co-authors
Salvatore Plumari
(University of Catania (Italy))
francesco scardina
(INFN Catania)
