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SUMMARY:Sachi Hashimoto (Boston University)
DTSTART:20200527T190000Z
DTEND:20200527T200000Z
DTSTAMP:20260423T022837Z
UID:etag2020/1
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/etag2020/1/"
 >An obstruction to weak approximation on a Calabi-Yau threefold</a>\nby Sa
 chi Hashimoto (Boston University) as part of Experimental Talks in Algebra
 ic Geometry\n\n\nAbstract\nIn this talk\, we investigate the arithmetic st
 ructure of a class of Calabi-Yau threefolds. These threefolds were constru
 cted over the complex numbers by Hosono and Takagi as a linear section of 
 a double quintic symmetroid\, and have a beautiful and simple story in the
  geometry of quadrics over the rational numbers. In forthcoming work with 
 Honigs\, Lamarche\, and Vogt\, we exhibit an obstruction to weak approxima
 tion on these threefolds. For the "experimental" nature of this seminar\, 
 we will conclude by working through a demonstration in cocalc. Attendees a
 re asked to make cocalc accounts to participate fully\; no prior coding ex
 perience necessary!\n
LOCATION:https://researchseminars.org/talk/etag2020/1/
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