报告一
报告题目：Geometry of vortices on the sphere in the dissolving limit
主 讲 人：Martin Speight 教授 英国利兹大学数学院
时 间：6月23日17:00
ZOOM ID：210-089-8623
密 码：123456
主办单位：数学与统计学院
欢迎光临！
报告摘要：We consider the dielectric Skyrme model proposed recently, with and without the addition of the standard pion mass term. Then we write down Bogomol’nyi-type energy bounds for both the massless and massive cases. We further show that, except for when taking the strict Bogomol’nyi-Prasad-Sommerfield (BPS) limit, the skyrmions are made of three orthogonal dipoles that can always be placedin their attractive channel and form bound states.
专家简介：Martin Speight is a professor of mathematics at Leeds University, UK. Martin received his Ph.D. from Durham University in 1995 and has been a postdoc at Texas University at Austin, USA, and at the Max Planck Institute in Leipzig, Germany. Martin's research interests lie in the field of mathematical physics and geometrical formulations of physical and solitonic systems.He is especially known for his work on intervortex forces, on near-BPS Skyrmions, and on the concept of restricted harmonicity. Martin has published more than 50 papers in Phys. Rev. Lett., Commun. Math. Phys., Phys. Rev. D, Phys. Rev. B, Phys. Lett. B, Nucl. Phys. B, Nonlinearity, Lett. Math. Phys., J. Math. Phys., J. Geom. Phys., J. Phys. A, Proc. Roy. Soc. Lond., etc.
报告二
报告题目：Domain wall strings
主 讲 人：Jose Queiruga 西班牙巴斯克大学
时 间：6月23日21:00
ZOOM ID：210-089-8623
密 码：123456
主办单位：数学与统计学院
欢迎光临！
报告摘要：In this talk I will discuss the spectrum of linearized excitations of global vortices in 2+1 dimensions. After identifying the existence of localized excitation modes, the decay time scale of the first two will be compared with the results given by the numerical evolution of the full non-linear equations. I will show numerically how the interaction of vortices with an external source of radiation or other vortices can excite these modes dynamically. I will also explore the evolution of a network of vortices in an expanding (2+1) dimensional background, in particular, in a radiation dominated universe and analyze the excitation of the internal modes.
专家简介：Dr. Jose Queiruga obtained his Ph.D from the University of Santiago de Compostela, Spain, in 2014, has been a postdoc at the University of Sao Paulo, Brazil, and at Karlsruher Institut für Technologie (KIT), Germany, and is now a postdoc at the University of the Basque Country, Bilbao, Spain. Jose's research is focused on solitons and supersymmetry. He has published more than 25 papers in Journal of High Energy Physics, Journal of Cosmology and Astroparticle Physics, Physical Review D,Classical Quantum Gravity, Journal of Physics A, and Nuclear Physics B, with over 350 citations in total.
