报告题目：Hadrons, Superconductor Vortices and Cosmological Constant
报告人：Prof. Keh-Fei Liu （肯塔基大学）
报告时间：2023年10月17日 上午10:00
报告地点：理8栋118学术报告厅
报告内容：
We explore the roles of the trace anomaly in several hadron properties. We point out that the energy-equilibrium correspondence derived from the gravitational form factors (GFF) of hadrons infers an equation of state where the trace anomaly matrix element, emerging from the glue condensate in the vacuum, gives a negative constant pressure that leads to confinement, much like the confinement mechanism for the vortices in type II superconductors where the negative pressure is due to the cost of depleting the superconducting condensate. We also note that both the trace anomaly in the QCD energy-momentum tensor and the cosmological constant in Einstein's equation are associated with the metric term and they play similar roles. Their difference in terms of the role the pressure plays is also discussed. Finally, we note that a lattice calculation of the trace anomaly distribution in the pion has addressed a question about the trace anomaly contribution to the pion mass and suggests that the conformal symmetry breaking and chiral symmetry breaking in QCD are intertwined in this case.
报告人简介：
Keh-Fei Liu was born in Beijing and grew up in Taiwan. He obtained his Ph. D. from Stony Brook University and has been on the faculty of University of Kentucky until this year. He is now working at Lawrence Berkeley National Lab.His major research area is in lattice gauge theory, working mainly on nucleon structure, neutron electron dipole moment, neutrino scattering and finite density. He is a fellow of the American Physical Society. He is also interested in the design of an accelerator based fusion reactor.