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DTSTAMP:20261028T142109Z
UID:b0df8a61148269c1689241717b1a8d191c5b0638
DTSTART;TZID=Europe/Oslo:20261029T141500
DTEND;TZID=Europe/Oslo:20261029T151500
LOCATION:N.H. Abels hus 1120
DESCRIPTION:We prove that a very general quartic sixfold admits no decompo
 sition of the diagonal, and in particular is not stably rational. The pro
 of uses specialization to an explicit quartic sixfold birational to a qua
 dric bundle of the type considered by Colliot-Thélène and Ojanguren. We a
 lso prove stable irrationality for very general six-dimensional intersect
 ions of four quadrics.\n\nhttps://www.mn.uio.no/math/english/research/gro
 ups/algebra/events/seminars/2026/ottem.html
SUMMARY:John Christian Ottem (UiO) – Very general quartic sixfolds are not
  stably rational
URL:https://www.mn.uio.no/math/english/research/groups/algebra/events/semi
 nars/2026/ottem.html
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