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BEGIN:VEVENT
DTSTART;VALUE=DATE:20260601
DTEND;VALUE=DATE:20260606
DTSTAMP:20260620T230046
CREATED:20260226T144700Z
LAST-MODIFIED:20260226T144700Z
UID:12743-1780272000-1780703999@crc326gaus.de
SUMMARY:Conference: Vertex algebras\, automorphic forms and combinatorics
DESCRIPTION:For more information see \nhttps://conferences.cirm-math.fr/3656.html
URL:https://crc326gaus.de/event/conference-vertex-algebras-automorphic-forms-and-combinatorics/
LOCATION:Marseille
CATEGORIES:GAUS-Workshop
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260601T101500
DTEND;TZID=Europe/Berlin:20260601T114500
DTSTAMP:20260620T230046
CREATED:20260421T091855Z
LAST-MODIFIED:20260421T091855Z
UID:13153-1780308900-1780314300@crc326gaus.de
SUMMARY:de Rham-Witt complex
DESCRIPTION:Timon Tausendpfund \n§6: Seminormal aspects \nThe de Rham–Witt complex is invariant under semi-normalization (and recovers the semi-normalization of a ring). Cover §§6.1-6.2 and §§6.5-6.6\, with a focus on Proposition 6.2.1\, Corollary 6.5.2\, and Theorem 6.5.3. As time permits\, introduce crystalline cohomology (as the cohomology of the structure sheaf on the crystalline site relative to the divided power ring (Zp\,(p))\, see for example the book by Berthelot or Tag 07GI in the Stacks project) and cover §6.4.
URL:https://crc326gaus.de/event/de-rham-witt-complex-5/
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:20260602T160000
DTEND;TZID=Europe/Berlin:20260602T170000
DTSTAMP:20260620T230046
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<G\, a critical tool used to analyze automorphic forms is to use spectral decomposition (e.g Selberg trace formula). For rank one hyperbolic manifolds the spectrum is either well understood or far beyond reach (e.g Selberg eigenvalue conjecture). In infinite volume the spectrum becomes linked to interesting geometric features of the manifold. In this talk I will survey some results about the spectrum of infinite co-volume subgroups and the connection to geometry and representation theory. This will include work with Dubi Kelmer and Alex Kontorovich\, as well as work with Tobias Weich and Lasse Wolf. \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-15/
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260603T140000
DTEND;TZID=Europe/Berlin:20260603T170000
DTSTAMP:20260620T230046
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:20260608T101500
DTEND;TZID=Europe/Berlin:20260608T114500
DTSTAMP:20260620T230046
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:20260609T160000
DTEND;TZID=Europe/Berlin:20260609T170000
DTSTAMP:20260620T230046
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:20260610T140000
DTEND;TZID=Europe/Berlin:20260610T170000
DTSTAMP:20260620T230046
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:20260611T090000
DTEND;TZID=Europe/Berlin:20260611T110000
DTSTAMP:20260620T230046
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:20260611T100000
DTEND;TZID=Europe/Berlin:20260611T123000
DTSTAMP:20260620T230046
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:20260611T111500
DTEND;TZID=Europe/Berlin:20260611T124500
DTSTAMP:20260620T230046
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:20260611T141500
DTEND;TZID=Europe/Berlin:20260611T151500
DTSTAMP:20260620T230046
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:20260611T141500
DTEND;TZID=Europe/Berlin:20260611T160000
DTSTAMP:20260620T230046
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:20260612T133000
DTEND;TZID=Europe/Berlin:20260612T143000
DTSTAMP:20260620T230046
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:20260612T140000
DTEND;TZID=Europe/Berlin:20260612T160000
DTSTAMP:20260620T230046
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:20260612T153000
DTEND;TZID=Europe/Berlin:20260612T170000
DTSTAMP:20260620T230046
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:20260615T101500
DTEND;TZID=Europe/Berlin:20260615T114500
DTSTAMP:20260620T230046
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:20260616T160000
DTEND;TZID=Europe/Berlin:20260616T170000
DTSTAMP:20260620T230046
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:20260618T090000
DTEND;TZID=Europe/Berlin:20260618T110000
DTSTAMP:20260620T230046
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:20260618T111500
DTEND;TZID=Europe/Berlin:20260618T124500
DTSTAMP:20260620T230046
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:20260618T140000
DTEND;TZID=Europe/Berlin:20260618T160000
DTSTAMP:20260620T230046
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:20260618T160000
DTEND;TZID=Europe/Berlin:20260618T180000
DTSTAMP:20260620T230046
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:20260618T163000
DTEND;TZID=Europe/Berlin:20260618T173000
DTSTAMP:20260620T230046
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:20260619T133000
DTEND;TZID=Europe/Berlin:20260619T143000
DTSTAMP:20260620T230046
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:20260620T230046
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
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260622T101500
DTEND;TZID=Europe/Berlin:20260622T114500
DTSTAMP:20260620T230046
CREATED:20260421T100218Z
LAST-MODIFIED:20260421T100218Z
UID:13159-1782123300-1782128700@crc326gaus.de
SUMMARY:de Rham-Witt complex
DESCRIPTION:Daniel Fink \n§9: The derived the Rham-Witt complex 2/2 \nBy the criterion of the previous talk\, the de Rham–Witt complex recovers the de Rham complex for a more general class of rings. Cover §9.5\, in particular Theorem 9.5.6\, Corollary 9.5.19\, and Theorem 9.5.21.
URL:https://crc326gaus.de/event/de-rham-witt-complex-8/
LOCATION:Mainz\, Hilbertraum (05-432)
CATEGORIES:GAUS-AG
ORGANIZER;CN="Tom Bachmann":MAILTO:tom.bachmann@uni-mainz.de
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260623T160000
DTEND;TZID=Europe/Berlin:20260623T170000
DTSTAMP:20260620T230046
CREATED:20260416T144354Z
LAST-MODIFIED:20260617T062754Z
UID:13096-1782230400-1782234000@crc326gaus.de
SUMMARY:International Seminar on Automorphic Forms
DESCRIPTION:Zeros of Poincaré series\nNoam Kimmel (MPIM Bonn) \nWe explore the zeros of certain Poincaré series P(k\,m) of weight k and index m for the full modular group. These are distinguished modular forms\, which have played a key role in the analytic theory of modular forms. We study the zeros of P(k\,m) when the weight k tends to infinity. The case where the index m is constant was considered by Rankin who showed that in this case almost all of the zeros lie on the unit arc |z|=1. In this talk we will explore the location of the zeros when the index m grows with the weight k\, finding a range of different limit laws. Along the way\, we also establish a version of Quantum Unique Ergodicity for some ranges. \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-18/
CATEGORIES:GAUS-AG
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260624T140000
DTEND;TZID=Europe/Berlin:20260624T160000
DTSTAMP:20260620T230046
CREATED:20260616T062328Z
LAST-MODIFIED:20260616T062328Z
UID:13585-1782309600-1782316800@crc326gaus.de
SUMMARY:Oberseminar Algebra und Geometrie
DESCRIPTION:Jonas Heintze (Universität Bonn): Poincare duality for Fargues Fontaine curve with almost coefficients \nAbstract: The Fargues-Fontaine curve is a central geometric object in modern approaches to p-adic Hodge theory. In this talk\, we will sketch ongoing work aimed at establishing Poincaré duality for the Fargues-Fontaine curve(s) viewed as analytic stacks using almost mathematics. This work is closely related to recent work of Anschütz\, Le Bras\, and Mann. \n  \n 
URL:https://crc326gaus.de/event/oberseminar-algebra-und-geometrie-10/
LOCATION:Frankfurt\, Robert-Mayer-Str. 6-8\, Raum 308
CATEGORIES:GAUS-Seminar
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260625T090000
DTEND;TZID=Europe/Berlin:20260625T110000
DTSTAMP:20260620T230046
CREATED:20260407T112310Z
LAST-MODIFIED:20260428T102022Z
UID:13012-1782378000-1782385200@crc326gaus.de
SUMMARY:Poincaré-Dualität in Charakteristik p
DESCRIPTION:Vortrag 9: Gerstenauflösung II – Alberto Merici
URL:https://crc326gaus.de/event/poincare-dualitat-in-charakteristik-p-9/
LOCATION:Heidelberg\, Mathematikon\, SR 8\, Heidelberg\, Germany
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260625T111500
DTEND;TZID=Europe/Berlin:20260625T124500
DTSTAMP:20260620T230046
CREATED:20260324T101157Z
LAST-MODIFIED:20260618T134330Z
UID:12907-1782386100-1782391500@crc326gaus.de
SUMMARY:The K-Theory of Z/p^n
DESCRIPTION:Talk 9: Relative-to-absolute descent III – Chenyi Yang (Universität Heidelberg)
URL:https://crc326gaus.de/event/the-k-theory-of-z-pn-8/
LOCATION:Heidelberg\, Mathematikon\, SR 8 und Zoom\, Germany
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260625T141500
DTEND;TZID=Europe/Berlin:20260625T151500
DTSTAMP:20260620T230046
CREATED:20260529T092432Z
LAST-MODIFIED:20260616T115630Z
UID:13471-1782396900-1782400500@crc326gaus.de
SUMMARY:AGTZ Kolloquium
DESCRIPTION:Shai Keidar (Uni Regensburg) \nTitle: pi-finite Galois theory \nAbstract: In the higher-categorical world\, Galois theory extends beyond finite groups: one can study Galois extensions for an arbitrary E_1-group. We develop such a theory for higher semiadditive categories\, where finite groups are naturally replaced by pi-finite groups. Under height assumptions\, we construct an n-truncated pro-pi-finite “absolute Galois group” representing all Galois extensions\, and develop a higher Kummer theory relating abelian extensions to the Picard spectrum. As an illustration\, we attach a pro-pi-finite Galois space to a rational Stefanich ring and give an algorithm computing it.
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
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END:VCALENDAR