BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Jonny Evans (University of Lancaster) DTSTART:20220208T163000Z DTEND:20220208T173000Z DTSTAMP:20260423T022625Z UID:Geolis/71 DESCRIPTION:Title: Symplectic cohomology of compound Du Val singularities\nby Jonny Evans (University of Lancaster) as part of Geometria em Lisboa (IST)\n\n\nAbstr act\n(Joint with Y. Lekili) If someone gives you a variety with a singular point\, you can try and get some understanding of what the singularity lo oks like by taking its “link”\, that is you take the boundary of a nei ghbourhood of the singular point. For example\, the link of the complex pl ane curve with a cusp y^2 = x^3 is a trefoil knot in the 3-sphere. I want to talk about the links of a class of 3-fold singularities which come up i n Mori theory: the compound Du Val (cDV) singularities. These links are 5- dimensional manifolds. It turns out that many cDV singularities have the s ame 5-manifold as their link\, and to tell them apart you need to keep tra ck of some extra structure (a contact structure). We use symplectic cohomo logy to distinguish the contact structures on many of these links.\n LOCATION:https://researchseminars.org/talk/Geolis/71/ END:VEVENT END:VCALENDAR