报告题目：Emergence of hydrodynamic behaviour in expanding quark-gluon plasma
报告人：Pro.Jean-Paul Blaizot，CEA-Saclay Institut de Physique Théorique
报告摘要：Ultra-relativistic heavy ion collisions allow us to study the densest and hottest forms of matter that can be created in the laboratory. Such states of matter, called quark-gluon plasmas, have existed in the early universe for only a brief instant, a few microseconds after the big bang. A striking feature that emerges from these heavy ion experiments is that the time evolution of the produced quark-gluon plasma is well described by viscous hydrodynamics, with a low value of the viscosity (relative to the entropy density). This observation, added to the recent discovery that the same description works well also for high energy proton-nucleus or high multiplicity proton-proton collisions, is raising a number of interesting theoretical questions. Among those is that of how the system of gluons freed in the early stage of a collision evolve towards local thermal equilibrium, in particular how the momentum distribution of the produced particles evolves towards an isotropic distribution — a prerequisite of local equilibrium— in spite of the strong longitudinal expansion of the produced matter. Much of the material covered in the last part of the talk will be taken from my recent paper with Li Yan from Fudan university [arXiv: 1904.08677].
报告人简介：Blaizot studied mathematics and physics at the École normale supérieure (Paris) with a degree in 1969. From 1975, he conducted research for the CNRS , where he was director of research in 1994 (from 2007 classe exceptionelle ). In 1977 he received his doctorate at the University of Paris VII (Denis Diderot) (Dissertation: Theory of elementary suggestions of nuclei) and was a post-doctoral student until 1978 at the Niels Bohr Institute in Copenhagen. From 1980 to 1982 he was Visiting Assistant Professor at the University of Illinois at Urbana-Champaign and from 1989 to 1990 a visiting scholar at the Brookhaven National Laboratory, From 1995 to 1998 he was Deputy Director of the Department of Theoretical Physics at the Commissariat à l'énergie atomique et aux energies alternative (CEA) in Saclay . In 2009 he was guest professor in Tokyo.
From 2004 to 2008 he was director of the European Center for Theoretical Studies in Nuclear Physics and Related Areas (ECT) in Trento.
He works as a theorist with the nuclear many-body problem (including QCD -Freiheitsgrade), collective excitations in nuclei and nuclear matter , quark-gluon plasma and phenomenology of heavy ion collisions, Bose-Einstein condensation , nonperturbative methods in quantum field theory and quantum field theory at finite temperature and with the renormalization group .
In 1997 he received the Prix Jean Ricard and in 1994 the Langevin Prize of the Académie des sciences. In 2009 he received the J. Hans D. Jensen Prize from the University of Heidelberg and in 2010 he received an ERC Advanced Grant for the study of strongly coupled QCD matter.