报告人：华中科技大学 冯波 副教授

报告题目：QCD in a magnetic field

时间：2015年11月13日星期五上午10点

地点：物理馆323室

报告摘要：Extremely large magnetic fields up to $10^{17}-10^{18}$ Gauss could be generated in non-central heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC) or even higher in Large Hadron Collider (LHC)\@.  Such a strong magnetic field would have significant effects to the dynamics of QCD, the underlying theory of strong interaction, providing a host of interesting phenomena.  In this talk, I will focus on the effect of magnetic field on the chiral condensate.  It had been proved many years ago that the magnetic field plays a role as ``catalysis'' to the chiral symmetry breaking, for which the transition temperature would increase as an increasing magnetic field.  The recent lattice QCD calculations, however, show apparent conflicting results against the magnetic catalysis.  I will briefly review the chiral symmetry and its breaking in strong interaction as well as its response of to the magnetic field.  The attention will be focused on magnetic catalysis effect and the lattice results.  Finally, I will show our recent works on the Bose-Einstein condensation of bound pairs in a magnetic field.  We found that the condensation temperature exhibits magnetic catalysis or the inverse effect depending on the coupling strength.  The specific results and their explanations would be presented at the end.