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X-WR-CALNAME:CRC 326 - GAUS
X-ORIGINAL-URL:https://crc326gaus.de
X-WR-CALDESC:Events for CRC 326 - GAUS
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260611T141500
DTEND;TZID=Europe/Berlin:20260611T151500
DTSTAMP:20260531T232839
CREATED:20260529T092030Z
LAST-MODIFIED:20260529T092030Z
UID:13466-1781187300-1781190900@crc326gaus.de
SUMMARY:AGTZ Kolloquium
DESCRIPTION:Calla Tschanz (Uni Bochum) \ntba
URL:https://crc326gaus.de/event/agtz-kolloquium-5/
LOCATION:Mainz\, Hilbertraum (05-432)
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Georg Tamme":MAILTO:georg.tamme@uni-mainz.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260612T133000
DTEND;TZID=Europe/Berlin:20260612T143000
DTSTAMP:20260531T232839
CREATED:20260507T081050Z
LAST-MODIFIED:20260507T081050Z
UID:13363-1781271000-1781274600@crc326gaus.de
SUMMARY:Eisenstein Congruences at Prime-Square Level
DESCRIPTION:Jaclyn Lang (Temple University Philadelphia) \nIn Mazur’s celebrated Eisenstein ideal paper\, he studies congruences between prime-level cusp forms and the unique weight-2 Eisenstein series of the same level. He shows that (if p is at least 5) such mod-p congruences exist if and only if the level N is congruent to 1 modulo p. In this talk\, we consider Eisenstein–cuspidal congruences in weight 2 and level N2\, still under the condition that N = 1 mod p. In this case\, recent work with Pollack and Wake shows that the relevant level-N2 Hecke algebra is a free module over an appropriate inertia-at-N pseudodeformation ring. This structure turns out to be surprisingly powerful. One can recover Mazur’s existence theorem that there exists a mod-p Eisenstein–cuspidal congruence in weight 2 and prime level N when N = 1 mod p. One can also recover the results of Merel and Lecouturier that characterize the rank of Mazur’s Hecke algebra in terms of the order of vanishing of a certain zeta element in cases when that rank is at most 3.  We will discuss some of the ideas that go into these results.  In addition to the joint work with Pollack and Wake\, the later results are joint with Palvannan and Müller.
URL:https://crc326gaus.de/event/eisenstein-congruences-at-prime-square-level/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260612T153000
DTEND;TZID=Europe/Berlin:20260612T170000
DTSTAMP:20260531T232839
CREATED:20260319T100329Z
LAST-MODIFIED:20260319T100329Z
UID:12877-1781278200-1781283600@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Federico Binda (Milano): tba \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl)
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-34/
LOCATION:Darmstadt\, Room 401 and Zoom\, Schlossgartenstraße 7\, Darmstadt\, 64289\, Germany
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Sabrina Pauli":MAILTO:pauli@mathematik.tu-darmstadt.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260618T163000
DTEND;TZID=Europe/Berlin:20260618T173000
DTSTAMP:20260531T232839
CREATED:20260529T092153Z
LAST-MODIFIED:20260529T092306Z
UID:13468-1781800200-1781803800@crc326gaus.de
SUMMARY:AGTZ Kolloquium
DESCRIPTION:Karin Schaller (JGU Mainz)
URL:https://crc326gaus.de/event/agtz-kolloquium-6/
LOCATION:Mainz\, Hilbertraum (05-432)
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Georg Tamme":MAILTO:georg.tamme@uni-mainz.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260619T133000
DTEND;TZID=Europe/Berlin:20260619T143000
DTSTAMP:20260531T232839
CREATED:20260519T104110Z
LAST-MODIFIED:20260519T104110Z
UID:13427-1781875800-1781879400@crc326gaus.de
SUMMARY:On arithmetical surjectivity and the Conjecture of Colliot-Thelene
DESCRIPTION:Florian Pop (University of Pennsylvania) \nThe notion of ‘arithmetical surjectivity’ (a.s.) for dominant morphisms f of proper smooth varieties over number fields was introduced by Colliot-Thelene\, and he made a precise\nconjecture (CCT) relating a.s. to birational properties of the morphisms f. The CCT was proved in a sharper form by Denef (2019)\, and Loughran-Skorobogatov-Smeets gave a\ncharacterization of a.s. (2020). I will present a new method of proof which allows generalizations/refinements of the above results by: First\, allowing k to be any finitely generated base fields k with char(k)=0 (and beyond). Second\, showing that a.s. is a fully birational property\, i.e.\, a.s. depends only on properties of the function field extension defined by morphisms f. The method of proof also yields generalizations of the so called\nzero-cycle surjectivity\, considered/characterized over number fields by Gvirtz (2020).\nNOTE: The problems are completely open in positive characteristic!
URL:https://crc326gaus.de/event/on-arithmetical-surjectivity-and-the-conjecture-of-colliot-thelene/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260619T153000
DTEND;TZID=Europe/Berlin:20260619T170000
DTSTAMP:20260531T232839
CREATED:20260319T100422Z
LAST-MODIFIED:20260520T110437Z
UID:12879-1781883000-1781888400@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Louisa Bröring (Duisburg-Essen): Quadratic Euler Characteristic of Geometrically Cyclic Branched Coverings \nThe quadratic Euler characteristic $\chi(X)$ of a smooth\, projective scheme\n$X$ over a field $k$ of characteristic not two is a refinement of the\ntopological Euler characteristic to quadratic forms\, constructed using motivic\nhomotopy theory. For example\, if $k\subset \mathbb{R}$\, then rank of $\chi(X)$\nis equal to the topological Euler characteristic of $X(\mathbb{C})$ and the\nsignature of $\chi(X)$ with respect to the given embedding is equal to the\ntopological Euler characteristic of $X(\mathbb{R})$. The quadratic Euler\ncharacteristic plays an import role in the programme of $\mathbb{A}^1$-refined\nenumerative geometry. \nAfter briefly introducing the quadratic Euler characteristic\, we present a\ncomputation of the quadratic Euler characteristic of geometrically cyclic\nbranched coverings leveraging Levine’s quadratic Riemann-Hurwitz formula. An\n$n$-fold geometrically cyclic branched covering is a morphism $f\colon Y \to\nX$ between smooth\, projective schemes together with a smooth\, closed subscheme\n$Z \subset X$ satisfying the following condition: there exists a line bundle\n$L$ over $X$ and a section $s \colon X \to L^{\otimes n}$ such that $Z$ is the\nzero locus of $s$ and $f$ is the pullback along $s$ of the map $L \to\nL^{\otimes n}$ taking $n$-th powers. \nAs an application\, we compute the quadratic Euler characteristic of branched\ndouble covers of $\mathbb{P}^2$\, which includes some K3 surfaces. \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl)
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-35/
LOCATION:Darmstadt\, Room 401 and Zoom\, Schlossgartenstraße 7\, Darmstadt\, 64289\, Germany
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Sabrina Pauli":MAILTO:pauli@mathematik.tu-darmstadt.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260625T141500
DTEND;TZID=Europe/Berlin:20260625T151500
DTSTAMP:20260531T232839
CREATED:20260529T092432Z
LAST-MODIFIED:20260529T092432Z
UID:13471-1782396900-1782400500@crc326gaus.de
SUMMARY:AGTZ Kolloquium
DESCRIPTION:Shai Keidar (Uni Regensburg)
URL:https://crc326gaus.de/event/agtz-kolloquium-7/
LOCATION:Mainz\, Hilbertraum (05-432)
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Georg Tamme":MAILTO:georg.tamme@uni-mainz.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260626T133000
DTEND;TZID=Europe/Berlin:20260626T143000
DTSTAMP:20260531T232839
CREATED:20260519T090513Z
LAST-MODIFIED:20260521T093535Z
UID:13425-1782480600-1782484200@crc326gaus.de
SUMMARY:Elliptic curves attached to abelian threefolds with imaginary multiplication
DESCRIPTION:Pip Goodman (University of Barcelona) \nLet A be an abelian threefold defined over a number field K whose endomorphism algebra is isomorphic to an imaginary quadratic field M. In recent joint work with Fité\, we proved the existence of an elliptic curve E defined over K with CM by M such that for any prime \ell\, the twisted Tate module V_\ell(E) (1)  is a sub representation of \wedge^3 V_\ell(A).\nIn this talk I will give an overview of the proof of the above result and present work in progress with Chidambaram and Fité where we provide explicit families of examples of the above phenomenon.
URL:https://crc326gaus.de/event/elliptic-curves-attached-to-abelian-threefolds-with-imaginary-multiplication/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260626T143000
DTEND;TZID=Europe/Berlin:20260626T163000
DTSTAMP:20260531T232839
CREATED:20260427T115524Z
LAST-MODIFIED:20260427T115524Z
UID:13242-1782484200-1782491400@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Konstantin Jakob (Darmstadt): tba \nBitte früheren Beginn um 14:30 beachten.\nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl)
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-39/
LOCATION:Darmstadt\, Room 401 and Zoom\, Schlossgartenstraße 7\, Darmstadt\, 64289\, Germany
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Sabrina Pauli":MAILTO:pauli@mathematik.tu-darmstadt.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260702T141500
DTEND;TZID=Europe/Berlin:20260702T151500
DTSTAMP:20260531T232839
CREATED:20260529T093017Z
LAST-MODIFIED:20260529T093017Z
UID:13473-1783001700-1783005300@crc326gaus.de
SUMMARY:AGTZ Kolloquium
DESCRIPTION:Markus Spitzweg (Uni Osnabrück)
URL:https://crc326gaus.de/event/agtz-kolloquium-8/
LOCATION:Mainz\, Hilbertraum (05-432)
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Georg Tamme":MAILTO:georg.tamme@uni-mainz.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260703T153000
DTEND;TZID=Europe/Berlin:20260703T170000
DTSTAMP:20260531T232839
CREATED:20260319T100517Z
LAST-MODIFIED:20260319T100517Z
UID:12881-1783092600-1783098000@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Yujie Xu (Columbia): tba \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl)
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-36/
LOCATION:Darmstadt\, Room 401 and Zoom\, Schlossgartenstraße 7\, Darmstadt\, 64289\, Germany
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Sabrina Pauli":MAILTO:pauli@mathematik.tu-darmstadt.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260709T141500
DTEND;TZID=Europe/Berlin:20260709T151500
DTSTAMP:20260531T232839
CREATED:20260529T093132Z
LAST-MODIFIED:20260529T093132Z
UID:13475-1783606500-1783610100@crc326gaus.de
SUMMARY:AGTZ Kolloquium
DESCRIPTION:Konstantin Emming (Uni Bonn)
URL:https://crc326gaus.de/event/agtz-kolloquium-9/
LOCATION:Mainz\, Hilbertraum (05-432)
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Georg Tamme":MAILTO:georg.tamme@uni-mainz.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260710T150000
DTEND;TZID=Europe/Berlin:20260710T170000
DTSTAMP:20260531T232839
CREATED:20260427T115635Z
LAST-MODIFIED:20260427T115641Z
UID:13244-1783695600-1783702800@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Vukašin Mihajlović (Darmstadt): tba \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl)
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-copy-3/
LOCATION:Darmstadt\, Room 401 and Zoom\, Schlossgartenstraße 7\, Darmstadt\, 64289\, Germany
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Sabrina Pauli":MAILTO:pauli@mathematik.tu-darmstadt.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260717T150000
DTEND;TZID=Europe/Berlin:20260717T170000
DTSTAMP:20260531T232839
CREATED:20260427T115730Z
LAST-MODIFIED:20260427T115730Z
UID:13247-1784300400-1784307600@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Yanik Kleibrink (Darmstadt): tba \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl)
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-40/
LOCATION:Darmstadt\, Room 401 and Zoom\, Schlossgartenstraße 7\, Darmstadt\, 64289\, Germany
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Sabrina Pauli":MAILTO:pauli@mathematik.tu-darmstadt.de
END:VEVENT
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