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SUMMARY:Johannes Nicaise (Imperial College/KU Leuven)
DTSTART:20221202T140000Z
DTEND:20221202T150000Z
DTSTAMP:20260423T035539Z
UID:LAGARTOS/50
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/LAGARTOS/50/
 ">Tropical degenerations and irrationality of hypersurfaces in products of
  projective spaces</a>\nby Johannes Nicaise (Imperial College/KU Leuven) a
 s part of (LAGARTOS) Latin American Real and Tropical Geometry Seminar\n\n
 \nAbstract\nThe specialization map for stable birational types associates 
 with every strictly toroidal one-parameter degeneration an obstruction to 
 the stable rationality of a very general fiber. In many applications\, sui
 table degenerations can be constructed by hand\, but there are also cases 
 where the complexity gets too high to write down explicit equations\, and 
 one needs to rely on tropical geometry to give a combinatorial description
  in terms of regular subdivisions of Newton polytopes. I will illustrate t
 his technique for hypersurfaces in products of projective spaces. This is 
 based on joint work with John Christian Ottem.\n
LOCATION:https://researchseminars.org/talk/LAGARTOS/50/
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