题 目：Q-monopole-ball
报告人：白杨
时 间：2022年5月20日（星期五）下午 2:00
地 点：Zoom meeting ID: 831 831 2021 Passcode: 137137
邀请人：边立功
报告人简介：
白杨，教授， 1998-2002本科就读于中国科学技术大学，2002-2007博士就读于耶鲁大学，2007-2012先后在费米和SLAC国家实验室做博士后。2012至今在威斯康星大学麦迪逊分校工作。主要从事关于超标准模型新物理的理论研究。研究课题包括暗物质，碰撞机物理，黑洞以及早期宇宙学。最近对大尺度暗物质模型以及探测方法感兴趣。
报告摘要：
A soliton state with both topological and non-topological charges is shown to exist in a certain broken gauge theory with an additional global U(1) symmetry. This new soliton state, Q-monopole-ball, is shown to be stable from decaying into an isolated Q-ball and a magnetic monopole state. There exists a minimum global charge for a Q-monopole-ball being stable from decaying into free global U(1)-charged particles and an isolated monopole. Q-monopole-balls with a large magnetic charge can also be stable if the topological charge is smaller than the cubic root of the global charge. Q-monopole-balls could be produced from a phase transition in the early universe and account for all dark matter.
