【01.26】Tetrahedron instantons
Webinar
报告题目:Tetrahedron instantons
报告人:张欣宇 博士(德国电子同步加速器研究所)
主持人:张 昊 副研究员(中科院高能所)
时间:2022年1月26日(周三) 下午15点
Zoom:4456457666 / 123456
链接:https://ihep-ac-cn.zoom.us/j/4456457666?pwd
报告摘要:
We introduce and analyze tetrahedron instantons, which can be realized in string theory by D0-branes probing a configuration of intersecting D6-branes with a nonzero constant background B-field. Physically they capture instantons in six-dimensional gauge theories with the most general intersecting codimention-two supersymmetric defects. We study the properties of the moduli space of tetrahedron instantons. We compute the instanton partition function, which lies between the higher-rank Donaldson-Thomas invariants and the partition function of the magnificent four model. Remarkably the instanton partition function has a closed-form expression in terms of the plethystic exponential, and matches the index of M-theory on a Calabi-Yau fivefold. Our computations provide an equivariant test of the duality between M-theory and type IIA string theory.
报告人简介:
张欣宇,德国电子同步加速器研究所(DESY)博士后。2007-2011年就读于北京大学物理学院,2017年在美国纽约州立大学石溪分校获得物理学博士学位,从2017至2020年在美国罗格斯大学从事博士后研究工作。现主要从事理论物理和数学物理方面的研究。
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