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SUMMARY:Lena Ji (University of Michigan)
DTSTART:20220922T223000Z
DTEND:20220922T233000Z
DTSTAMP:20260422T055611Z
UID:SFUQNTAG/69
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/SFUQNTAG/69/
 ">Rationality of conic bundle threefolds over non-closed fields</a>\nby Le
 na Ji (University of Michigan) as part of SFU NT-AG seminar\n\n\nAbstract\
 nClemens–Griffiths introduced the classical intermediate Jacobian obstru
 ction to rationality for complex threefolds\, and used it to show irration
 ality of the cubic threefold. Recently\, over non-closed fields\, Hassett
 –Tschinkel and Benoist–Wittenberg refined this obstruction using torso
 rs over the intermediate Jacobian. In this talk\, we identify these interm
 ediate Jacobian torsors for conic bundle threefolds\, and we give applicat
 ions to rationality over non-closed fields. This talk is based on joint wo
 rk with S. Frei\, S. Sankar\, B. Viray\, and I. Vogt\, and on joint work w
 ith M. Ji.\n
LOCATION:https://researchseminars.org/talk/SFUQNTAG/69/
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