| Friday 19 April 2024 | |
| Events for day: Thursday 20 August 2020 |
| 11:00 - 12:00 Theory Weekly Seminar (TWS)-skyroom Gauges and Symmetries School PARTICLES AND ACCELERATORS Abstract: In this talk, I will review the notion of gauge symmetries and gauge redundancies in the gauge systems with boundaries. I start with some toy models and some intuitions. Then I review the first and second and the new generalized Noether theorems. Then I go over the covariant phase space method as a formalism for obtaining charges (and their algebra) of global and gauge symmetries as the generators on associated phase space. https://www.skyroom.online/ch/ipm-particles/hep-th ... 18:00 - 19:00 Commutative Algebra Webinars Laurent Series and Asymptotic Behavior of Ext over Graded Complete Intersections School MATHEMATICS Let R be a graded commutative ring generated over a field by finitely many homogeneous elements of positive degree. Work of Avramov, Buchweitz and Sally shows that, under certain assumptions, the Laurent series expansions around 1 of the Hilbert series of two graded R-modules and those of some of their Ext modules are related. When R is a complete intersection, we show that such relations are connected to the asymptotic behavior of the Ext modules. (This is joint work with David A. Jorgensen and Peder Thompson.) School (Access link will be announced by email a day before the webinar dat ... |