报告题目：A hydrodynamic approach to the connection between initial eccentricity fluctuations and flow harmonics
报 告 人：钱卫良（University of São Paulo, Brazil, 教授）
报告时间：2014年7月10日（星期四）上午9：30-10：30
报告地点：嘉定园区学术活动中心307

报告简介：
Event by event fluctuations in the initial conditions play an important role in evolution of the system created in heavy ion collisions. In fact, the collective flow observed in heavy ion collisions is largely attributed to those initial geometrical fluctuations, while the hydrodynamic evolution transforms those initial spatial irregularities into final state momentum anisotropies. Cumulant analysis provides a mathematical tool to decompose those initial fluctuations in terms of radial and azimuthal components. It is usually thought that a specified order of azimuthal cumulant, for the most part, linearly produces flow harmonic of the same order. By using a hydrodynamic code called NeXSPheRIO, we carry out a systematic study on the connection between cumulants and flow harmonics. In particular, we try to quantitatively calculate the deviation from the linearity between cumulants and flow harmonics by focusing on each cumulant order. We show that the non-linearity is actually big enough, as a natural consequence of the non-linear nature of hydrodynamics. It is argued that the results obtained can be understood intuitively in terms of a peripheral-tube model.

报告人简介：

EDUCATION:
Sept. 1998 – Jul. 2003 Ph.D. in Theoretical Physics, Fudan University, China Supervisor: Prof. Ru-Keng Su
Feb. 1995 - Jul. 1998 Bachelor in Theoretical Physics, Fudan University, China

PROFESSIONAL EXPERIENCE:
Jan. 2014 – present Professor Doutor, University of São Paulo, Brazil
Jun. 2010 – Dec. 2013 Professor Adjunto, Federal University of Ouro Preto, Brazil
Oct. 2005 – Jun. 2010 Postdoctoral Researcher, University of São Paulo, Brazil
Jul. 2003 – Sept. 2005 Lecturer, Fudan University, China

RESEARCH INTERESTS:
1. Hydrodynamic Model of Heavy Ion Nuclear Collisions
High energy heavy-ion collisions, space-time evolution, flow and anisotropic flow, hydrodynamic description, freeze-out, comparison and combination of hydrodynamics and transport models, hadronic equation of state
2. Nuclear Matter and its Phase Transition
Quantum hadronic dynamics, liquid-gas phase transition, lattice-gas model, non-topological soliton bag, strange matter, strange quark matter, hypernuclei, quasi-particle model

SELECTED PUBLICATIONS:
1. Topology studies of hydrodynamics using two particle correlation analysis, J. Takahashi, B. Tavares, W.L. Qian, R. Andrade, F. Grassi, Y. Hama, T. Kodama, and N. Xu, Phys. Rev.Lett. 103 (2009) 242301.
2. Importance of Granular Structure in the Initial Conditions for the Elliptic Flow. R. Andrade, F. Grassi, Y. Hama, T. Kodama, W.L. Qian, Phys. Rev. Lett.101 (2008) 112301.
3. Decomposition of fluctuating initial conditions and flow harmonics. W.-L. Qian, Ph. Mota, R. P. G. Andradea, F. Gardim, F. Grassia, Y. Hama and T. Kodama, J. Phys.G: Nucl. Part. Phys. 40 (2014) 015103
4. Isospin dependence of liquid-gas phase transition in hot asymmetric nuclear matter, W.L.Qian, R.K Su and P.Wang, Phys. Lett. B 491 (2000) 90.
5. Temporal evolution of tubular initial conditions and their influence on two-particle correlations in relativistic nuclear collisions. R. Andrade, F. Grassi, Y. Hama and W.-L. Qian. Phys.Lett. B712 (2012) 226-230