BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CRC 326 - GAUS - ECPv6.16.4//NONSGML v1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-ORIGINAL-URL:https://crc326gaus.de X-WR-CALDESC:Events for CRC 326 - GAUS REFRESH-INTERVAL;VALUE=DURATION:PT1H X-Robots-Tag:noindex X-PUBLISHED-TTL:PT1H BEGIN:VTIMEZONE TZID:Europe/Berlin BEGIN:DAYLIGHT TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST DTSTART:20250330T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:20251026T010000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST DTSTART:20260329T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:20261025T010000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST DTSTART:20270328T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:20271031T010000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=Europe/Berlin:20260618T163000 DTEND;TZID=Europe/Berlin:20260618T173000 DTSTAMP:20260619T004904 CREATED:20260529T092153Z LAST-MODIFIED:20260612T101403Z UID:13468-1781800200-1781803800@crc326gaus.de SUMMARY:AGTZ Kolloquium DESCRIPTION:Karin Schaller (JGU Mainz) \nTitel: Nobodies are perfect\, semigroups are not. \nNewton-Okounkov bodies provide a powerful link between algebraic geometry and convex geometry\, extending the correspondence between toric varieties and lattice polytopes. They are constructed from valuation semigroups associated with divisors\, making the finite generation of these semigroups a natural and important question. After an introduction to toric geometry\, we study valuation semigroups on toric surfaces arising from non-toric flags. Based on joint work with Altmann\, Haase\, Küronya\, and Walter\, the talk presents a combinatorial criterion for the finite generation of these semigroups. 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:20260618T160000 DTEND;TZID=Europe/Berlin:20260618T180000 DTSTAMP:20260619T004904 CREATED:20260612T095116Z LAST-MODIFIED:20260612T100534Z UID:13546-1781798400-1781805600@crc326gaus.de SUMMARY:Oberseminar Algebra und Geometrie DESCRIPTION:Dr. Giusi Capobianco: Algebraic and tropical Prym-Torelli map \nAbstract: Given an étale double cover of smooth curves one can associate a principally polarized abelian variety called the Prym variety. The map from the moduli space of double covers Rg to the moduli space of pp abelian varieties Ag-1 is called Prym-Torelli\, in analogy with the Jacobian case. This map does not extend to a morphism from the boundary of Rg to any of the standard toroidal compactifications of Ag-1. In this talk I will present their tropical counterpart and prove that\, with a slight modification of the definition\, the tropical Prym-Torelli map is continuous.\nThis result is part of my PhD thesis and will appear on the arXiv soon. URL:https://crc326gaus.de/event/oberseminar-algebra-und-geometrie-9/ LOCATION:Frankfurt\, RM-Str. 6-8\, R. 308 CATEGORIES:GAUS-Seminar END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Berlin:20260618T140000 DTEND;TZID=Europe/Berlin:20260618T160000 DTSTAMP:20260619T004904 CREATED:20260608T111855Z LAST-MODIFIED:20260608T111855Z UID:13523-1781791200-1781798400@crc326gaus.de SUMMARY:Cohomology of symmetric stacks DESCRIPTION:I will talk about a joint project with Chenjing Bu\, Ben Davison\, Andrés Ibáñez-Núñez\, and Tasuki Kinko. For a large class of stacks\, we decompose their cohomology in terms of what we call BPS cohomology\, which is a structure originating in enumerative geometry of Calabi-Yau 3-folds\, but which is of interest beyond this class of examples. Such stacks include smooth stacks (such as the moduli of G-bundles on a curve)\, symplectic stacks (such as the moduli of G-Higgs bundle on a curve)\, or some (-1)-shifted symplectic stacks (such as the moduli of semistable sheaves on a Calabi-Yau threefold). URL:https://crc326gaus.de/event/cohomology-of-symmetric-stacks/ LOCATION:Heidelberg\, MATHEMATIKON\, SR 007\, Im Neuenheimer Feld 205\, Heidelberg\, 69120\, Germany CATEGORIES:GAUS-Seminar ORGANIZER;CN="Georg Bernhard Oberdieck":MAILTO:georgo@uni-heidelberg.de END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Berlin:20260618T111500 DTEND;TZID=Europe/Berlin:20260618T124500 DTSTAMP:20260619T004904 CREATED:20260324T095438Z LAST-MODIFIED:20260428T094146Z UID:12902-1781781300-1781786700@crc326gaus.de SUMMARY:The K-Theory of Z/p^n DESCRIPTION:Talk 8: Relative-to-absolute descent II – Chenyi Yang (Universität Heidelberg) URL:https://crc326gaus.de/event/gaus-ag-the-k-theory-of-z-pn/ LOCATION:Heidelberg\, Mathematikon\, SR 8 and Zoom\, INF 205\, Heidelberg\, Germany CATEGORIES:GAUS-AG END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Berlin:20260618T090000 DTEND;TZID=Europe/Berlin:20260618T110000 DTSTAMP:20260619T004904 CREATED:20260407T112157Z LAST-MODIFIED:20260428T101935Z UID:13010-1781773200-1781780400@crc326gaus.de SUMMARY:Poincaré-Dualität in Charakteristik p DESCRIPTION:Vortrag 8: Gerstenauflösung I – Immanuel Klevesath URL:https://crc326gaus.de/event/poincare-dualitat-in-charakteristik-p-8/ LOCATION:Heidelberg\, Mathematikon\, SR 8\, Heidelberg\, Germany CATEGORIES:GAUS-AG END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Berlin:20260616T160000 DTEND;TZID=Europe/Berlin:20260616T170000 DTSTAMP:20260619T004904 CREATED:20260416T144303Z LAST-MODIFIED:20260612T122111Z UID:13097-1781625600-1781629200@crc326gaus.de SUMMARY:International Seminar on Automorphic Forms DESCRIPTION:A Geometric Approach to Ki’s L4 Norm Bound\nTrajan Hammonds (Aarhus) \nThe behavior of L^p norms of automorphic forms is a central topic in analytic number theory. In 2023\, Haseo Ki proved the Iwaniec-Sarnak conjecture for L4 norms for Hecke-Maass cusp forms\, long thought to be out of reach. In this talk\, I will present joint work with Anshul Adve\, along with work of Paul Nelson\, providing a new proof of Haseo Ki’s optimal L4 norm bound. The key novelty is avoiding a hands-on analysis of Bessel function asymptotics\, at least in the critical range. Instead we are able to recast the essential estimates into a simple problem in incidence geometry and solve it. \nZoom (680 4828 0736\, The password is the first Fourier coefficient of the modular j-function (as digits)). URL:https://crc326gaus.de/event/international-seminar-on-automorphic-forms-17/ CATEGORIES:GAUS-AG END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Berlin:20260615T101500 DTEND;TZID=Europe/Berlin:20260615T114500 DTSTAMP:20260619T004904 CREATED:20260421T092343Z LAST-MODIFIED:20260421T092343Z UID:13157-1781518500-1781523900@crc326gaus.de SUMMARY:de Rham-Witt Complex DESCRIPTION:Klaus Mattis \n§9: The derived de Rham-Witt complex 1/2 \nAlternative description of the de Rham–Witt complex. More general criterion for when it can recover the de Rham complex. Define the derived de Rham–Witt and derived de Rham complexes (Construction 9.2.5\, Variant 9.2.6) and the conjugate filtration (Remark 9.2.7). Discuss Theorem 9.3.1 (the saturated de Rham–Witt complex in terms of the derived one). Prove Corollary 9.3.5 as an application. Prove Theorem 9.4.1 and Proposition 9.4.6. URL:https://crc326gaus.de/event/de-rham-witt-complex-7/ LOCATION:Mainz\, Hilbertraum (05-432) CATEGORIES:GAUS-AG ORGANIZER;CN="Tom Bachmann":MAILTO:tom.bachmann@uni-mainz.de END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Berlin:20260612T153000 DTEND;TZID=Europe/Berlin:20260612T170000 DTSTAMP:20260619T004904 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:20260612T140000 DTEND;TZID=Europe/Berlin:20260612T160000 DTSTAMP:20260619T004904 CREATED:20260608T111700Z LAST-MODIFIED:20260608T111700Z UID:13521-1781272800-1781280000@crc326gaus.de SUMMARY:Crossed instantons in algebraic geometry DESCRIPTION:In a series of papers\, Nekrasov introduces moduli spaces of “crossed instantons\,” certain quiver representations modeling instantons on unions of 2-planes in 4-space. The geometry of these spaces encodes information about moduli of sheaves on surfaces and produces deformations of characters of quantum affine algebras. In work with Martijn Kool and Woonam Lim\, we study Nekrasov’s moduli spaces from the perspective of algebraic geometry. I’ll explain how invariants of moduli spaces of crossed instantons can be defined using a construction from sheaf-counting on Calabi-Yai 4-folds. I’ll also state a speculative description of these spaces as moduli spaces of framed sheaves on a projective 4-fold. URL:https://crc326gaus.de/event/crossed-instantons-in-algebraic-geometry/ LOCATION:Heidelberg\, MATHEMATIKON\, SR 007\, Im Neuenheimer Feld 205\, Heidelberg\, 69120\, Germany CATEGORIES:GAUS-Seminar ORGANIZER;CN="Georg Bernhard Oberdieck":MAILTO:georgo@uni-heidelberg.de END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Berlin:20260612T133000 DTEND;TZID=Europe/Berlin:20260612T143000 DTSTAMP:20260619T004904 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:20260611T141500 DTEND;TZID=Europe/Berlin:20260611T160000 DTSTAMP:20260619T004904 CREATED:20260430T083859Z LAST-MODIFIED:20260430T083859Z UID:13301-1781187300-1781193600@crc326gaus.de SUMMARY:Symmetric Power Functoriality DESCRIPTION:14:15 Talk 6 Deforming Global Galois Representations: Nils Tietke \n  \n  URL:https://crc326gaus.de/event/symmetric-power-functoriality-6/ LOCATION:Heidelberg CATEGORIES:GAUS-AG END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Berlin:20260611T141500 DTEND;TZID=Europe/Berlin:20260611T151500 DTSTAMP:20260619T004904 CREATED:20260529T092030Z LAST-MODIFIED:20260605T084138Z UID:13466-1781187300-1781190900@crc326gaus.de SUMMARY:AGTZ Kolloquium DESCRIPTION:Calla Tschanz (Uni Bochum) \nTitle:\nFrom logarithmic Hilbert schemes to degenerations of hyperkähler varieties \nAbstract:\nIn this talk\, I will discuss my previous work on constructing explicit models of logarithmic Hilbert schemes. This relates to work or Li-Wu on expanded degenerations\, Gulbrandsen-Halle-Hulek on degenerations of Hilbert schemes of points and Maulik-Ranganathan on logarithmic Hilbert schemes. The constructions I consider are local. I will then explain how we globalise these in joint work with Shafi and apply them to construct minimal type III degenerations of hyperkähler varieties\, namely Hilbert schemes of points on K3 surfaces. 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:20260611T111500 DTEND;TZID=Europe/Berlin:20260611T124500 DTSTAMP:20260619T004904 CREATED:20260318T132125Z LAST-MODIFIED:20260324T100239Z UID:12866-1781176500-1781181900@crc326gaus.de SUMMARY:The K-theory of Z/p^n DESCRIPTION:Talk 7: Generators and relations descriptions for the Nygaard filtration –\nOtmar Venjakob (Universität Heidelberg) URL:https://crc326gaus.de/event/the-k-theory-of-z-pn-7/ LOCATION:Heidelberg\, Mathematikon\, SR 8 and Zoom\, INF 205\, Heidelberg\, Germany CATEGORIES:GAUS-AG END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Berlin:20260611T100000 DTEND;TZID=Europe/Berlin:20260611T123000 DTSTAMP:20260619T004904 CREATED:20260414T091033Z LAST-MODIFIED:20260421T125806Z UID:13070-1781172000-1781181000@crc326gaus.de SUMMARY:WKB Analysis: From Quadratic Differentials to Stokes matrices DESCRIPTION:10:00 – 11:00 Talk 7: Paul Siemon (TU Darmstadt): SL(n\, C)-Opers \n11:30 – 12:30 Talk 8: Johannes Horn (Goethe Universität): SL(n\, C)-spectral networks and WKB analysis for opers \n  \n  URL:https://crc326gaus.de/event/wkb-analysis-from-quadratic-differentials-to-stokes-matrices-3/ LOCATION:Frankfurt\, Robert-Mayer-Str. 6-8\, Raum 309 CATEGORIES:GAUS-AG END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Berlin:20260611T090000 DTEND;TZID=Europe/Berlin:20260611T110000 DTSTAMP:20260619T004904 CREATED:20260407T112038Z LAST-MODIFIED:20260428T102053Z UID:13008-1781168400-1781175600@crc326gaus.de SUMMARY:Poincaré-Dualität in Charakteristik p DESCRIPTION:Vortrag 7: Dimension der Kohomologiegruppen – Alexander Schmidt URL:https://crc326gaus.de/event/poincare-dualitat-in-charakteristik-p-7/ LOCATION:Heidelberg\, Mathematikon\, SR 8\, Heidelberg\, Germany CATEGORIES:GAUS-AG END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Berlin:20260610T140000 DTEND;TZID=Europe/Berlin:20260610T170000 DTSTAMP:20260619T004904 CREATED:20260423T082052Z LAST-MODIFIED:20260504T133600Z UID:13222-1781100000-1781110800@crc326gaus.de SUMMARY:Specialization of iterated Galois groups DESCRIPTION:14:00 – 15:15 Talk 5: Leonie Nienhaus (Goethe Universität Frankfurt): Proof of theorems 1.2 and 1.3 \n15:45 – 17:00 Talk 6: Benjamin Steklov (Goethe Universität Frankfurt): Proof of theorem 1.4 \n  \n  URL:https://crc326gaus.de/event/specialization-of-iterated-galois-groups-2/ LOCATION:Frankfurt\, Robert-Mayer-Str. 6-8\, Raum 308 CATEGORIES:GAUS-AG END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Berlin:20260609T160000 DTEND;TZID=Europe/Berlin:20260609T170000 DTSTAMP:20260619T004904 CREATED:20260416T144210Z LAST-MODIFIED:20260421T110720Z UID:13098-1781020800-1781024400@crc326gaus.de SUMMARY:International Seminar on Automorphic Forms DESCRIPTION:tba\nHassan Saad (LSU) \nZoom (680 4828 0736\, The password is the first Fourier coefficient of the modular j-function (as digits)). URL:https://crc326gaus.de/event/international-seminar-on-automorphic-forms-16/ CATEGORIES:GAUS-AG END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Berlin:20260608T101500 DTEND;TZID=Europe/Berlin:20260608T114500 DTSTAMP:20260619T004904 CREATED:20260421T092119Z LAST-MODIFIED:20260421T092140Z UID:13155-1780913700-1780919100@crc326gaus.de SUMMARY:de Rham-Witt Complex DESCRIPTION:Anton Engelmann \nDerived considerations \nThe Nygaard filtration and foundations for the last four talks. Define filtered derived categories (Construction 8.4.1) and the Beilinson t-structure (Remark 8.4.8). Use Proposition 8.4.10 as a definition for the functor Lηp\, and give a more explicit description relating it to the functor ηp of §2.1. Discuss Proposition 7.2.4\, Theorem 7.4.7 and Corollary 7.4.8. Finally\, define the Nygaard filtration as in Proposition 8.4.11. As time permits\, come back to some descriptions and properties in §8.1 and §8.2. URL:https://crc326gaus.de/event/de-rham-witt-complex-6/ LOCATION:Mainz\, Hilbertraum (05-432) CATEGORIES:GAUS-AG ORGANIZER;CN="Tom Bachmann":MAILTO:tom.bachmann@uni-mainz.de END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Berlin:20260603T140000 DTEND;TZID=Europe/Berlin:20260603T170000 DTSTAMP:20260619T004904 CREATED:20260423T081650Z LAST-MODIFIED:20260504T133400Z UID:13218-1780495200-1780506000@crc326gaus.de SUMMARY:Specialization of iterated Galois groups DESCRIPTION:14:00 – 15:15 Talk 3: Ruth Wild (Goethe Universität Frankfurt): Extension of the base field – part I \n15:45 – 17:00 Talk 4: Magnus Carlson (Goethe Universität Frankfurt): Extension of the base field – part II \n  \n  URL:https://crc326gaus.de/event/specialization-of-iterated-galois-groups-copy/ LOCATION:Frankfurt\, Robert-Mayer-Str. 6-8\, Raum 308 CATEGORIES:GAUS-AG END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Berlin:20260602T160000 DTEND;TZID=Europe/Berlin:20260602T170000 DTSTAMP:20260619T004904 CREATED:20260416T144116Z LAST-MODIFIED:20260601T090141Z UID:13099-1780416000-1780419600@crc326gaus.de SUMMARY:International Seminar on Automorphic Forms DESCRIPTION:Spectral theory of automorphic forms: infinite co-volume.\nChris Lutsko (University of Houston) \nGiven a Lie group G and a discrete subgroup Γ