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SUMMARY:Oana Padurariu (Boston University)
DTSTART;VALUE=DATE-TIME:20220923T143000Z
DTEND;VALUE=DATE-TIME:20220923T160000Z
DTSTAMP;VALUE=DATE-TIME:20220927T055308Z
UID:Columbia-NumberTheorySeminar/1
DESCRIPTION:Title: On Quadratic Analogues of Kenku’s Theorem\nby O
ana Padurariu (Boston University) as part of Columbia - Automorphic forms
and arithmetic seminar\n\n\nAbstract\nKenku determined in 1981 all possibl
e cyclic isogenies of elliptic curves\nover $\\mathbb{Q}$\, building on Ma
zur’s 1978 work on prime degree isogenies. Although more than\n40 years
have passed\, the determination of cyclic isogenies of elliptic curves ove
r a single\nother number field has until now not been realized. In this ta
lk I will present a procedure\nto assist in establishing such a determinat
ion for a given quadratic field. Running this\nprocedure on all quadratic
fields $\\mathbb{Q}(\\sqrt{d})$ with $|d| < 104$ we obtain\, conditional o
n the\nGRH\, the determination of cyclic isogenies of elliptic curves over
19 quadratic fields.\nThis is joint work with Barinder Banwait and Filip
Najman.\n
LOCATION:https://researchseminars.org/talk/Columbia-NumberTheorySeminar/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andrew Obus (CUNY-Baruch College)
DTSTART;VALUE=DATE-TIME:20221014T143000Z
DTEND;VALUE=DATE-TIME:20221014T160000Z
DTSTAMP;VALUE=DATE-TIME:20220927T055308Z
UID:Columbia-NumberTheorySeminar/2
DESCRIPTION:by Andrew Obus (CUNY-Baruch College) as part of Columbia - Aut
omorphic forms and arithmetic seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/Columbia-NumberTheorySeminar/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jacques Tilouine (Universite Paris 13)
DTSTART;VALUE=DATE-TIME:20221021T143000Z
DTEND;VALUE=DATE-TIME:20221021T160000Z
DTSTAMP;VALUE=DATE-TIME:20220927T055308Z
UID:Columbia-NumberTheorySeminar/3
DESCRIPTION:by Jacques Tilouine (Universite Paris 13) as part of Columbia
- Automorphic forms and arithmetic seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/Columbia-NumberTheorySeminar/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Siyan Daniel Li-Huerta (Harvard University)
DTSTART;VALUE=DATE-TIME:20220909T143000Z
DTEND;VALUE=DATE-TIME:20220909T160000Z
DTSTAMP;VALUE=DATE-TIME:20220927T055308Z
UID:Columbia-NumberTheorySeminar/4
DESCRIPTION:Title: The plectic conjecture over local fields\nby Siya
n Daniel Li-Huerta (Harvard University) as part of Columbia - Automorphic
forms and arithmetic seminar\n\n\nAbstract\nThe étale cohomology of varie
ties over Q enjoys a Galois action. In the case of Hilbert modular varieti
es\, Nekovář-Scholl observed that this Galois action on the level of coh
omology extends to a much larger profinite group: the plectic group. Motiv
ated by applications to higher-rank Euler systems\, they conjectured that
this extension holds even on the level of complexes\, as well as for more
general Shimura varieties.\n\nWe present a proof of the analog of this con
jecture for local Shimura varieties. Consequently\, we obtain results for
the basic locus of global Shimura varieties\, after restricting to a decom
position group. The proof crucially uses a mixed-characteristic version of
fusion due to Fargues–Scholze.\n
LOCATION:https://researchseminars.org/talk/Columbia-NumberTheorySeminar/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chandrashekhar Khare (UCLA)
DTSTART;VALUE=DATE-TIME:20220930T143000Z
DTEND;VALUE=DATE-TIME:20220930T160000Z
DTSTAMP;VALUE=DATE-TIME:20220927T055308Z
UID:Columbia-NumberTheorySeminar/5
DESCRIPTION:by Chandrashekhar Khare (UCLA) as part of Columbia - Automorph
ic forms and arithmetic seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/Columbia-NumberTheorySeminar/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Robert Pollack (Boston University)
DTSTART;VALUE=DATE-TIME:20221118T153000Z
DTEND;VALUE=DATE-TIME:20221118T170000Z
DTSTAMP;VALUE=DATE-TIME:20220927T055308Z
UID:Columbia-NumberTheorySeminar/6
DESCRIPTION:by Robert Pollack (Boston University) as part of Columbia - Au
tomorphic forms and arithmetic seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/Columbia-NumberTheorySeminar/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ari Shnidman (Hebrew University of Jerusalem)
DTSTART;VALUE=DATE-TIME:20221209T153000Z
DTEND;VALUE=DATE-TIME:20221209T170000Z
DTSTAMP;VALUE=DATE-TIME:20220927T055308Z
UID:Columbia-NumberTheorySeminar/7
DESCRIPTION:by Ari Shnidman (Hebrew University of Jerusalem) as part of Co
lumbia - Automorphic forms and arithmetic seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/Columbia-NumberTheorySeminar/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jinbo Ren (Xiamen University)
DTSTART;VALUE=DATE-TIME:20220916T143000Z
DTEND;VALUE=DATE-TIME:20220916T160000Z
DTSTAMP;VALUE=DATE-TIME:20220927T055308Z
UID:Columbia-NumberTheorySeminar/8
DESCRIPTION:by Jinbo Ren (Xiamen University) as part of Columbia - Automor
phic forms and arithmetic seminar\n\nAbstract: TBA\n\nZoom talk\n
LOCATION:https://researchseminars.org/talk/Columbia-NumberTheorySeminar/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hélène Esnault (Freie Universität Berlin)
DTSTART;VALUE=DATE-TIME:20221104T143000Z
DTEND;VALUE=DATE-TIME:20221104T160000Z
DTSTAMP;VALUE=DATE-TIME:20220927T055308Z
UID:Columbia-NumberTheorySeminar/9
DESCRIPTION:by Hélène Esnault (Freie Universität Berlin) as part of Col
umbia - Automorphic forms and arithmetic seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/Columbia-NumberTheorySeminar/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Naomi Sweeting (Harvard University)
DTSTART;VALUE=DATE-TIME:20221007T143000Z
DTEND;VALUE=DATE-TIME:20221007T160000Z
DTSTAMP;VALUE=DATE-TIME:20220927T055308Z
UID:Columbia-NumberTheorySeminar/10
DESCRIPTION:by Naomi Sweeting (Harvard University) as part of Columbia - A
utomorphic forms and arithmetic seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/Columbia-NumberTheorySeminar/10
/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eric Chen (Princeton University)
DTSTART;VALUE=DATE-TIME:20221111T153000Z
DTEND;VALUE=DATE-TIME:20221111T170000Z
DTSTAMP;VALUE=DATE-TIME:20220927T055308Z
UID:Columbia-NumberTheorySeminar/11
DESCRIPTION:by Eric Chen (Princeton University) as part of Columbia - Auto
morphic forms and arithmetic seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/Columbia-NumberTheorySeminar/11
/
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