{"id":18,"date":"2021-04-16T10:41:38","date_gmt":"2021-04-16T10:41:38","guid":{"rendered":"https:\/\/www.mi.uni-koeln.de\/RepTheory\/?page_id=18"},"modified":"2025-09-12T06:40:29","modified_gmt":"2025-09-12T06:40:29","slug":"forschungsseminar","status":"publish","type":"page","link":"https:\/\/www.mi.uni-koeln.de\/RepTheory\/forschungsseminar\/","title":{"rendered":"Research seminars"},"content":{"rendered":"\n<script src=\"https:\/\/polyfill.io\/v3\/polyfill.min.js?features=es6\"><\/script>\n\t<script id=\"MathJax-script\" async=\"\" src=\"https:\/\/cdn.jsdelivr.net\/npm\/mathjax@3\/es5\/tex-mml-chtml.js\"><\/script>\n\n\n\n<h3>Seminare und Vortr\u00e4ge im WS 2025\/2026<\/h3>\n\n\n\n<table id=\"tablepress-15\" class=\"tablepress tablepress-id-15\">\n<thead>\n<tr class=\"row-1 odd\">\n\t<th class=\"column-1\" style=\"width:13%;\">Date<\/th><th class=\"column-2\" style=\"width:25%;\">Lecturer<\/th><th class=\"column-3\" style=\"width:20%;\">Seminar<\/th><th class=\"column-4\" style=\"width:20%;\">Theme<\/th><th class=\"column-5\" style=\"width:20%;\">Time<\/th><th class=\"column-6\" style=\"width:7%;\">Location<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-hover\">\n<tr class=\"row-2 even\">\n\t<td class=\"column-1\">30 Sep 2026<\/td><td class=\"column-2\">Bernhard Keller   (Universit\u00e9 Paris Cit\u00e9, France)  <\/td><td class=\"column-3\"><\/td><td class=\"column-4\">Report on Kong\u2013Liu\u2013Shen's disproof of Han's conjecture<br \/>\n<br \/>\nAbstract. In 2006, Yang Han conjectured that a finite-dimensional algebra has finite global dimension if its Hochschild homology vanishes in all sufficiently high degrees. The analogous statement for finitely generated commutative algebras follows from work of BACH and of Avramov\u2013Vigu\u00e9-Poirier. The conjecture itself was shown to hold for many classes of algebras by several authors including Bergh, Cibils, Erdmann, Lanzilotta, Marcos, Redondo, Solotar, Su\u00e1rez-\u00c1lvarez, Vivas, Ren Wang, Xiaoxiao Xu, Yunge Xu, Jinbi Zhang, and Guodong Zhou. In late August 2026, Bochao Kong, Yeqin Liu and Yu Shen posted a preprint where they construct a counter-example starting from Krah's universal phantom on the blow-up of the projective plane in 10 general points. We will sketch their construction, focusing on the passage from a proper dg algebra to a finite-dimensional algebra concentrated in degree zero.<\/td><td class=\"column-5\">Wednesday 2-3pm<br \/>\nTime Zone Berlin, Rome, Paris<br \/>\n<br \/>\n<\/td><td class=\"column-6\">online<br \/>\nhttps:\/\/sites.google.com\/view\/lagoonwebinar\/home<br \/>\n<br \/>\n<\/td>\n<\/tr>\n<tr class=\"row-3 odd\">\n\t<td class=\"column-1\">13 Oct 2026<\/td><td class=\"column-2\">Johanne Haugland (NTNU)<\/td><td class=\"column-3\"><\/td><td class=\"column-4\">A geometric model for the module category of a special biserial algebra<br \/>\n<br \/>\nAbstract: In recent years, geometric models have emerged as an important tool in the study of the representation theory of algebras, and such models have highlighted important connections to other areas of mathematics. A geometric model for the module category of a gentle algebra, and more generally of a string algebra, has been developed by Baur and Coelho Sim\u00f5es. In this talk, we use this as a starting point for constructing a geometric model for the module category of a special biserial algebra. The talk is based on joint work in progress with Azzurra Ciliberti, Raquel Coelho Sim\u00f5es and Martin Herschend.<\/td><td class=\"column-5\">Tuesday, 2:30pm<br \/>\nTime Zone Berlin, Rome, Paris<\/td><td class=\"column-6\">in person<br \/>\nStefan-Cohn-Vossen<br \/>\nRaum 313, 3rd floor<\/td>\n<\/tr>\n<tr class=\"row-4 even\">\n\t<td class=\"column-1\">20 Oct 2026<\/td><td class=\"column-2\">Lior Silberberg<br \/>\n(IMJ-JRP)<\/td><td class=\"column-3\"><\/td><td class=\"column-4\">tba<\/td><td class=\"column-5\">Tuesday, 2:30pm<br \/>\nTime Zone Berlin, Rome, Paris<\/td><td class=\"column-6\">in person<br \/>\nStefan-Cohn-Vossen<br \/>\nRaum 313, 3rd floor<\/td>\n<\/tr>\n<tr class=\"row-5 odd\">\n\t<td class=\"column-1\">27 Oct 2026<\/td><td class=\"column-2\">Robert Szafarczyk (K\u00f8benhavns Universitet)<\/td><td class=\"column-3\"><\/td><td class=\"column-4\">tba<\/td><td class=\"column-5\"><\/td><td class=\"column-6\"><\/td>\n<\/tr>\n<tr class=\"row-6 even\">\n\t<td class=\"column-1\">28 Oct 2026<\/td><td class=\"column-2\">Zhengfang Wang   (University of Nanjing, China)<\/td><td class=\"column-3\"><\/td><td class=\"column-4\">tba<\/td><td class=\"column-5\"><\/td><td class=\"column-6\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-15 from cache -->\n\n\n","protected":false},"excerpt":{"rendered":"<p>Seminare und Vortr\u00e4ge im WS 2025\/2026<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/www.mi.uni-koeln.de\/RepTheory\/wp-json\/wp\/v2\/pages\/18"}],"collection":[{"href":"https:\/\/www.mi.uni-koeln.de\/RepTheory\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.mi.uni-koeln.de\/RepTheory\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.mi.uni-koeln.de\/RepTheory\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mi.uni-koeln.de\/RepTheory\/wp-json\/wp\/v2\/comments?post=18"}],"version-history":[{"count":25,"href":"https:\/\/www.mi.uni-koeln.de\/RepTheory\/wp-json\/wp\/v2\/pages\/18\/revisions"}],"predecessor-version":[{"id":1351,"href":"https:\/\/www.mi.uni-koeln.de\/RepTheory\/wp-json\/wp\/v2\/pages\/18\/revisions\/1351"}],"wp:attachment":[{"href":"https:\/\/www.mi.uni-koeln.de\/RepTheory\/wp-json\/wp\/v2\/media?parent=18"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}