物理系學術報告：From complex to stochastic potential: Heavy Quarkonia in the QGP



報告題目：	From complex to stochastic potential: Heavy Quarkonia in the QGP
報告人：	Alexander Rothkopf, Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, University of Bern, Switzerland
報告時間：	2013年4月24日 14:00
報告地點：	三樓報告廳C302
報告摘要:	The physics of a heavy quark bound state immersed in a thermal bath can be conveniently described by a non-relativistic two-body potential. Studies in perturbation theory already revealed that in the deconfined phase, scattering with the medium induces an imaginary part. Here we present recent results on how the determination of the potential can be extended to the non-perturbative regime. Based on Wilson loop spectral functions from lattice QCD both real- and imaginary part can be extracted at any temperature. The presence of an imaginary part reminds us that a static notion of heavy quarkonium suppression is inappropriate and we are lead to embrace an open quantum systems perspective instead. We show how in this framework the imaginary part is intimately linked to thermal fluctuations in the QGP.