报告题目：Universality in String Theory

主 讲 人：Ehsan Hatefi

单 位：意大利比萨高等师范学院

时 间：7月16日16:00

ZOOM ID：958 9012 3664

密 码：123456

摘 要：

We would like to introduce you to the fundamental objects,"D-branes", in String Theory. The main goal of our talk is to convey the importance of these objects not only in String Theory and fundamental physics but also in other fields such as Mathematical Physics and Geometry. We also highlight their roles in exploring further symmetries and unification. We try to talk about all kinds of effective actions in String Theory, involving DBI, Chern-Simons, and more importantly new Wess-Zumino actions. We would also like to provide a comprehensive explanation, not only for BPS branes, but also for D-brane-anti D-brane systems. Along with those actions, we also introduce various new techniques for mathematicians/string theorists to obtain exact and final forms of world-sheet integrals to all orders will be presented. Finally,we make various remarks on how to derive, without any ambiguity, all order α' corrections to some of the effective actions. We then mention several applications related to those effective actions for black holes and cosmology as well as other related areas.

简 介：

Ehsan Hatefi did his Ph.D. at CERN, Switzerland, and has been a postdoc at ICTP, Trieste, Italy, Queen Mary University, UK, Vienna Tech., Austria, Wasaw University, Poland and a Scuola Normale Superiore,Pisa, Italy. Soon he will move to Jilin University, China, to become a professor. Ehsan is an expert in String Theory and one of the few people able to perform all-order α' corrections, which has long been a hope for discovering deviations from nonstringy physics. On the other hand, these remarkable techniques have attracted interest mostly among mathematician due to the mathematical structure and advanced techniques, that eventually gave rise to string-math a new field of mathematics. Ehsan has published over 35 papers in JHEP, JCAP, Phys. Rev. D, Nucl. Phys. B,Phys. Lett. B, Class. Quant. Grav., etc.