报告人：Pawel Nurowski
报告地点：人民大街校区数学与统计学院104教室
报告时间：2026年07月01日星期三10:10-11:10
邀请人：陈良云
报告摘要：
In this talk, I will review the role of de Sitter space in physics over the last century and show how it connects to Eugenio Beltrami’s classical version of the Lobachevsky model of non-Euclidean geometry. Combining these ideas leads to a "Beltrami–de Sitter" manifold, which serves as the central subject of this talk.
The exploration of this concept will take us from classical geometry, through Penrose’s Conformal Cyclic Cosmology (CCC) and the introduction of enigmatic "ghosts," to the split real form of the exceptional Lie group $G_2$. I will conclude by discussing what this Beltrami–de Sitter hybrid manifold might mean for our interpretations of the universe and its (dark) matter content.
主讲人简介：
Pawel Nurowski is a professor at the Center for Theoretical Physics of the Polish Academy of Sciences, where he heads the Differential Geometry group, and a professor of mathematics at Guangdong Technion–Israel Institute of Technology. He has published papers in journals such as Commun. Math. Phys., J. Differential Geom., J. Reine Angew. Math., Trans. Amer. Math. Soc., Phys. Rev. D, and Adv. Math.
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