Geometry and Topology Seminar

The Geometry and Topology Seminar at the University of Haifa meets every two weeks, with talks on a wide range of topics in algebraic, geometric, differential, and symplectic topology, and in differential and algebraic geometry, broadly understood.

The seminar takes place on Wednesday 12:10 in room 614 (tentative). For more information please contact the seminar organizer, Frol Zapolsky.

U. Haifa Topology & Geometry seminar: Tuesday, Jan. 23, 2024. Speaker: Damien Calaque (Montpellier). Title: “Shifted symplectic reduction”.

This talk will be on Zoom:https://us02web.zoom.us/j/83920631646?pwd=cWZRWjllZWEvdjVSNVhTdUxMMGlwUT09 I will start explaining that Hamiltonian reduction can be understood as a particular instance of Lagrangian intersections, within the framework of shifted symplectic geometry. One can see this first part of the talk as…
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U. Haifa Topology & Geometry seminar: Tuesday, Jan. 9, 2024. Speaker: Carles Casacuberta (Barcelona). Title: “Homotopy reflectivity is equivalent to the weak Vopenka principle”.

Homotopy localizations with respect to arbitrary (possibly proper) classes of maps are known to existin suitably structured model categories assuming the validity of Vopenka’s principle from set theory.Through recent progress in large cardinal theory, we prove that the existence of…
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U. Haifa Topology & Geometry seminar: Sunday, Nov. 21, 2023. Speaker: Josefien Kuijper (Stockholm University). Title: “Compactly supported cohomology theories of varieties and six-functor formalisms”.

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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U. Haifa Topology & Geometry seminar: Sunday, July 24, 2022. Speaker: Simona Paoli (Aberdeen). Title: “Weakly globular double categories and weak units”.

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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U. Haifa Topology & Geometry seminar: Sunday, June 12, 2022. Speaker: Gil Bor (CIMAT, Mexico). Title: “Cusps of caustics by reflection in a convex billiard table”.

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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U. Haifa Topology & Geometry seminar: Sunday, May 29, 2022. Speaker: Markus Upmeier (Aberdeen). Title: “Cobordism categories and Atiyah-Singer index theory”.

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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U. Haifa Topology & Geometry seminar: Sunday, May 22, 2022. Speaker: Andrew Salch (Wayne State). Title: “Stable homotopy groups and special values of L-functions”.

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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U. Haifa Topology & Geometry seminar: Sunday, May 8, 2022. Speaker: Sourav Das (Haifa). Title: “Title:  Higgs bundles on nodal curves”.

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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