Geometry and Topology Seminar

Given a commutative ring or ring spectrum, there is a functor from finite sets to commutative rings sending a set to the tensor product of copies of the ring (or ring spectrum) indexed by that set.  The Loday construction extends…
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Time: 11:00 AM Recording:https://us02web.zoom.us/rec/share/9f42mPT6f_DrAb7PSelgFJxj4VF5XyBFR_w9Q_1pmd0l7N8vBrZA5s9tHsXNyc-I.WUIy_fbLn_vZCL1l Abstract: In the first part of this talk I will discuss a result about the existence of compactly supported versions of cohomology theories of varieties. In the second part of the talk I will discuss a…
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Time:         17:00 (Israel Time) Location:  Room 614 of the Science & Education Building, University of Haifa and on Zoom Recording link:https://us02web.zoom.us/rec/share/sYN7G8VN3MXfRuwaUOnvzT9ecrjTecjGgJs2YZu0AJXNFDkYdbidmfWzmtabE42N.WKmhxQ0j0aIqI9xl Abstract: Segal-type models of weak 2-categories are simplicial models of bicategories, and they comprise the Tamsamani model and the…
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Time:         17:00 (Israel Time) Location:  In Room 614 of the Science & Education Building, University of Haifa and on Zoom Recording: https://us02web.zoom.us/rec/share/11wbNQ9drctg3GJjEHL784aCI9iAczSpRsOuPha69BFsCmeQl6KXclBCWauaFMNF.mJ2eReCfMakLrdia Abstract. We place a light source inside a smooth convex billiard table (or mirror). The n-th caustic by…
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Time: 17:00 (Israel Time) Location: On Zoom Recording: https://us02web.zoom.us/rec/share/OCd0OzhQnH8AcW2AjbpVGS5hFi4vW11OkS6gE0sFu7oVeakAviNsc0RJMB0BeneB.nQls_DORtJQrjgt3 Abstract.   I will discuss work in progress that categorifies the analytic index of Atiyah-Singer in terms of a new construction using representation theory of Clifford algebras. My main theorem shows that…
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Time: 17:00 (Israel Time) Location: On Zoom Recording: https://us02web.zoom.us/rec/share/2p8IC8Cg-VEwNlgsDG_sQJRv-tPbLizEwXxI1DFuCzYujlmGkGa7ndhiUdxxLD9-.quz6ubBm7uCXOi-0 Abstract.  In this talk, I will survey the known relationships between stable homotopy groups of Bousfield localizations of finite spectra and special values of L-functions. Given a p-local finite spectrum X,…
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Time: 17:00 (Israel Time) Location: On Zoom Abstract. The goal of this talk is to report on the progress in the program of comparing the model of $(\infty,n)$-categories given by complicial sets with the more established models, in particular with…
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Time: 17:00 (Israel Time) Location: On Zoom Recording: https://us02web.zoom.us/rec/share/u3nIzULAEKHfZe3iCm0KZxftqdZ0Pzcjd0EGV3ipl6eZ_I_IOGMzzsCYk42k5sXJ.8zyeCrlu8P3ySdxb Abstract. In I987 Nigel Hitchin proved that the moduli space of Higgs bundles on a smooth projective curve (of genus greater than equal to 2) has a natural symplectic structure. In…
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Time: 17:00 (Israel Time) Location: On Zoom Abstract: The nerve functor from categories to simplicial sets allows to associate toany small category a homotopy type giving rise to a homotopy theory of smallcategories studied by Quillen, Thomason and Grothendieck. To…
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