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DTSTART;TZID=Europe/Berlin:20260203T140000
DTEND;TZID=Europe/Berlin:20260203T153000
DTSTAMP:20260424T003959
CREATED:20250915T110953Z
LAST-MODIFIED:20251020T072757Z
UID:11671-1770127200-1770132600@crc326gaus.de
SUMMARY:Tame Local Langlands
DESCRIPTION:Talk 13: The geometry of the stack of local Langlands parameters\nYifei Zhao (University of Münster) \nZoom (612 2072 7363\, Password: largest six digit prime number)
URL:https://crc326gaus.de/event/tame-local-langlands-030226/
LOCATION:Darmstadt\, Room 401 and Zoom\, Schlossgartenstraße 7\, Darmstadt\, 64289\, Germany
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260204T140000
DTEND;TZID=Europe/Berlin:20260204T180000
DTSTAMP:20260424T003959
CREATED:20251009T091423Z
LAST-MODIFIED:20260129T140249Z
UID:11848-1770213600-1770228000@crc326gaus.de
SUMMARY:p-adic Simpson correspondence
DESCRIPTION:Talk 11: Xinyu Shao (Leibniz Universität Hannover): The local correspondence \nTalk 12: Dmytro Rudenko (Leibniz Universität Hannover): Canonical Higgs fields for pro-étale bundles \n  \n 
URL:https://crc326gaus.de/event/p-adic-simpson-correspondence-6/
LOCATION:Frankfurt\, Robert-Mayer-Str. 6-8\, Raum 309
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260209T100000
DTEND;TZID=Europe/Berlin:20260209T120000
DTSTAMP:20260424T003959
CREATED:20251030T140151Z
LAST-MODIFIED:20251030T140151Z
UID:12106-1770631200-1770638400@crc326gaus.de
SUMMARY:Riemann-Hilbert correspondence in characteristic p
DESCRIPTION:Manuel Blickle (JGU Mainz) \nThe EK correspondence (2)
URL:https://crc326gaus.de/event/riemann-hilbert-correspondence-in-characteristic-p-13/
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:20260210T130000
DTEND;TZID=Europe/Berlin:20260213T140000
DTSTAMP:20260424T003959
CREATED:20260202T122429Z
LAST-MODIFIED:20260204T114537Z
UID:12636-1770728400-1770991200@crc326gaus.de
SUMMARY:Workshop "Moduli in Heidelberg"
DESCRIPTION:Veronica Arena : TBA \nLuca Battistella : Vector bundles on Olsson fans \nLogarithmic geometry is a language that combines piecewise-linear and algebraic geometry\, particularly useful for tracking the combinatorics of compactifications and degenerations of algebraic varieties. Olsson’s stack of logarithmic structures\, and its charts provided by Artin cones\, have played a fundamental role in moduli theory and enumerative geometry. Recent developments concerning stability\, good moduli spaces\, and logarithmic sheaf theory show the utility of considering Artin fans over a base\, or Olsson fans. In joint work with Francesca Carocci and Jonathan Wise\, we study their structure and vector bundles over them\, generalising the theory of equivariant bundles on toric varieties. If time permits\, I will discuss the relationship with Grassmannians and limit linear series that motivated our investigation. \nThomas Blomme : Correlated Gromov-Witten invariants & Multiple cover formula  \nAbelian surfaces are complex tori whose enumerative invariants seem to satisfy remarkable regularity properties. The computation of their reduced Gromov-Witten invariants in the case of primitive classes has already been well studied with many complete computations by Bryan-Oberdieck-Pandharipande-Yin. A few years ago\, G. Oberdieck conjectured a multiple cover formula expressing in a very simple way the invariants for the non-primitive classes in terms of the primitive one. This would close the computation of GW invariants for abelian surfaces. In this second talk\, we aim to explain how correlated invariants naturally show up in the decomposition formula for abelian surfaces\, and how they allow to prove the multiple cover formula conjecture for many instances. This is joint work with F. Carocci. \nFrancesca Carocci : Correlated Gromov-Witten invariants & DR cycle formula \nIn this talk\, we will talk about a geometric refinement for log Gromov -Witten invariants of P^1-bundles on smooth projective varieties\, called correlated Gromov-Witten invariants\, introduced in a joint work with T. Blomme. In order to compute them\, we proved a correlated refinement of Pixton double-ramification cycle formula with target varieties. We will state the formula and try to give an idea of how it is obtained as an application of the Universal DR formula of Bae-Holmes-Pandharipande-Schmitt-Schwarz. \nAitor Iribar Lopez : TBA \nPatrick Kenendy-Hunt : TBA \nNavid Nabijou : Tautological projection of the Prym-Torelli locus \nThe moduli space of abelian varieties admits a tautological ring generated by lambda classes. In contrast to the space of stable curves\, this tautological ring has a remarkably simple presentation. This allows for the construction of a canonical “tautological projection” which maps the full Chow ring onto the tautological subring\, providing a left inverse to the inclusion of the latter in the former. \nGiven a Chow class on the moduli space of abelian varieties\, it is natural to attempt to compute its tautological projection. For the Torelli locus (the locus of Jacobians) an algorithm was provided by Faber\, the difficult step being integrating monomials in lambda classes on the space of stable curves. \nWe establish a corresponding algorithm for the Prym-Torelli locus (the locus of Prym varieties). The novel geometric content is a closed formula relating three different types of lambda classes (source\, target\, and Prym) on the moduli space of admissible covers\, proved using Grothendieck-Riemann-Roch. \nThis is joint work in progress with Yoav Len and Sam Molcho. \n  \nDenis Nesterov : Hilbert-Chow crepant resolution conjecture \nThe conjecture in the title\, proposed by Ruan\, predicts that the quantum cohomology of Hilbert schemes of points on a surface is isomorphic to the orbifold cohomology of symmetric products. I will present a proof of the conjecture that relies on Fulton–MacPherson compactifications. \n  \nSabrina Pauli : Tropical correspondence theorems for plane curve counts over arbitrary fields \nWe study the problem of counting rational curves of fixed degree on a toric del Pezzo surface subject to point conditions. Over algebraically closed fields\, this count is invariant under the choice of point conditions. Over non-algebraically closed fields\, however\, the invariance fails. For real numbers\, Welschinger’s groundbreaking work introduced a signed count of real curves that restores invariance. \nBuilding on this\, Levine and Kass-Levine-Solomon-Wickelgren have developed curve counts over arbitrary fields that not only generalize Welschinger’s signed counts and classical counts over algebraically closed fields\, but also encode much richer arithmetic information. \nIn this talk I will survey these different approaches to counting rational curves with point conditions and discuss a recent joint result with A. Jaramillo Puentes\, H. Markwig\, and F. Röhrle. We establish a tropical correspondence theorem for curve counts over arbitrary fields\, identifying the count of algebraic curves with point conditions with a weighted count of their tropical counterparts with point conditions. The latter are combinatorial objects and there are several purely combinatorial methods to find all tropical curves with point conditions. \n  \nAaron Pixton : Cycles on universal Jacobians \nLet J be the degree 0 universal Jacobian over the moduli space of smooth curves of genus g. Its Chow ring\, CH(J)\, has an extra grading by weight (the Beauville decomposition). I will explain how to express the weight w part of CH(J) in terms of the Chow ring of a moduli space of curves with w marked points. This interpretation lets us translate ideas back and forth between cycles on universal Jacobians and cycles on moduli spaces of curves. Two consequences are a conjectural description of all tautological relations on universal Jacobians and a definition of a Fourier transform on moduli spaces of curves. I will also discuss how to extend this correspondence to compactified Jacobians over the moduli space of stable curves. This talk presents joint work with Younghan Bae. \nMaximilian Schimpf : TBA \nPim Spelier : TBA \nCalla Tschanz : From logarithmic Hilbert schemes to degenerations of hyperkähler varieties  \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. \n  \nAngelina Zheng : The Brill-Noether rank and Martens’ theorem for tropical curves \nDivisor theory on metric graphs has provided combinatorial proofs of several algebro-geometric results\, most notably in Brill–Noether theory. In algebraic geometry\, the dimensions of Brill–Noether loci play crucial roles\, as in Martens’ theorem characterizing hyperelliptic curves. However\, the tropical analogue of this result fails for metric graphs. Furthermore\, the dimension of Brill–Noether loci does not vary upper semicontinuous in the moduli of tropical curves\, as observed by C. M. Lim\, S. Payne\, and N. Potashnik. Motivated by this\, D. Jensen and Y. Len conjectured that replacing the dimension with the Brill–Noether rank would yield a valid tropical analogue. However\, this conjecture was later disproved by Coppens. \nIn this talk\, based on joint work with G. Capobianco\, I will discuss these counterexamples\, and generalise them to a wider class of graphs. Finally\, I’ll show that a suitably strengthened version of the conjecture holds for any graph.
URL:https://crc326gaus.de/event/workshop-moduli-in-heidelberg/
LOCATION:Heidelberg\, MATHEMATIKON\, Konferenzraum\, 5. OG\, Campus Im Neuenheimer Feld (INF)\, INF 205\, Heidelberg\, 69120\, Germany
CATEGORIES:GAUS-Workshop
ORGANIZER;CN="Georg Bernhard Oberdieck":MAILTO:georgo@uni-heidelberg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260210T140000
DTEND;TZID=Europe/Berlin:20260210T173000
DTSTAMP:20260424T003959
CREATED:20250915T111025Z
LAST-MODIFIED:20251013T092535Z
UID:11673-1770732000-1770744600@crc326gaus.de
SUMMARY:Tame Local Langlands
DESCRIPTION:Talk 14: Weil-Deligne representations and discrete parameters\nJoão Lourenço (Paris 13) \nExplain Sections 2.1.4 and 2.1.5. Focus on the following aspects.\n(1) Explain the stacks LocWD\nLG\,F and LocWLG\,F and the isomorphism of the former one with LocLG\,F . Explain the maps LocLG\,F ∼= LocWD LG\,F → LocWLG\,F → Spf ZLG\,F .\n(2) Define (essentielly) discrete Langlands parameters (before Def. 2.28 and Def. 2.28 itself).\n(3) Explain Prop. 2.32\, Cor. 2.33. Mention Lemma 2.34. \nTalk 15: The categorical local Langlands conjecture\nTimo Richarz (TU Darmstadt) \nRecall the theory of (ind)coherent sheaves (Chapter 9). Since we are happy\nto restrict to the case that Λ = Q¯ℓ\, we may assume that we are in the “classical”\ncharacteristic zero case. Then state the categorical local Langlands conjecture.\nUse the opportunity to summarized the first half the seminar. \nThe final session on February 10 will be a double session from 14:00 to 17:30\, followed by dinner. \nZoom (612 2072 7363\, Password: largest six digit prime number)
URL:https://crc326gaus.de/event/tame-local-langlands-100226/
LOCATION:Darmstadt\, Room 401 and Zoom\, Schlossgartenstraße 7\, Darmstadt\, 64289\, Germany
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260211T140000
DTEND;TZID=Europe/Berlin:20260211T180000
DTSTAMP:20260424T003959
CREATED:20251009T100104Z
LAST-MODIFIED:20260129T140522Z
UID:11854-1770818400-1770832800@crc326gaus.de
SUMMARY:p-adic Simpson correspondence
DESCRIPTION:Talk 13: Margherita Recchia (Leibniz Universität Hannover): Proof of the correspondence \nTalk 14: Simpson gerbe \n  \n 
URL:https://crc326gaus.de/event/p-adic-simpson-correspondence-7/
LOCATION:Frankfurt\, Robert-Mayer-Str. 6-8\, Raum 309
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260309
DTEND;VALUE=DATE:20260314
DTSTAMP:20260424T003959
CREATED:20251126T145550Z
LAST-MODIFIED:20251126T145550Z
UID:12269-1773014400-1773446399@crc326gaus.de
SUMMARY:Conference "Étale homotopy theory" - A conference on the occasion of Alexander Schmidt's 60th birthday
DESCRIPTION:
URL:https://crc326gaus.de/event/conference-etale-homotopy-theory-a-conference-on-the-occasion-of-alexander-schmidts-60th-birthday/
LOCATION:Heidelberg\, Mathematikon\, SR tba
CATEGORIES:GAUS-Workshop
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260325T150000
DTEND;TZID=Europe/Berlin:20260325T173000
DTSTAMP:20260424T003959
CREATED:20260312T151618Z
LAST-MODIFIED:20260319T091532Z
UID:12824-1774450800-1774459800@crc326gaus.de
SUMMARY:Oberseminar Algebra und Geometrie
DESCRIPTION:15:00 Uhr: Sara Sajadi (Universität Toronto): A Unified Finiteness Theorem For Curves \nAbstract: This talk presents a unified framework for finiteness results concerning arithmetic points on algebraic curves\, exploring the analogy between number fields and function fields. The number field setting\, joint work with F. Janbazi\, generalizes and extends classical results of Birch–Merriman\, Siegel\, and Faltings. We prove that the set of Galois-conjugate points on a smooth projective curve with good reduction outside a fixed finite set of places is finite\, when considered up to the action of the automorphism group of a proper integral model. Motivated by this\, we consider the function field analogue\, involving a smooth and proper family of curves over an affine curve defined over a finite field. In this setting\, we show that for a fixed degree\, there are only finitely many étale relative divisors over the base\, up to the action of the family’s automorphism group (and including the Frobenius in the isotrivial case). Together\, these results illustrate both the parallels and distinctions between the two arithmetic settings\, contributing to a broader unifying perspective on finiteness. \n16:30 Uhr: Benjamin Steklov (Goethe Universität): Fermat’s Last Theorem for Selmer sections \nAbstract: Wiles famously proved Fermat’s Last Theorem\, which states that the (affine) Fermat curve of exponent p>2 has no rational points. Grothendieck’s section conjecture predicts that for a hyperbolic curve over a number field\, rational points are controlled by sections of a natural exact sequence of étale fundamental groups. Combined with Fermat’s Last Theorem\, this suggests that the corresponding sequence for the Fermat curve admits only sections arising from cusps. In this talk\, we explain how to prove that this prediction holds for Selmer sections of the Fermat curve.
URL:https://crc326gaus.de/event/oberseminar-algebra-und-geometrie-5/
LOCATION:Frankfurt\, Robert-Mayer-Str. 10\, Raum 711 groß
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260407
DTEND;VALUE=DATE:20260411
DTSTAMP:20260424T003959
CREATED:20260304T102624Z
LAST-MODIFIED:20260304T102624Z
UID:12761-1775520000-1775865599@crc326gaus.de
SUMMARY:Junior Retreat
DESCRIPTION:
URL:https://crc326gaus.de/event/junior-retreat-3/
LOCATION:Jugendherberge Limburg
CATEGORIES:GAUS-Event
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260413T101500
DTEND;TZID=Europe/Berlin:20260413T114500
DTSTAMP:20260424T003959
CREATED:20260421T083510Z
LAST-MODIFIED:20260421T084629Z
UID:13130-1776075300-1776080700@crc326gaus.de
SUMMARY:de Rham-Witt complex
DESCRIPTION:Timo Weiß: Introduction  – Overview. Recollections on Witt vectors
URL:https://crc326gaus.de/event/introduction/
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:20260415T101500
DTEND;TZID=Europe/Berlin:20260415T114500
DTSTAMP:20260424T003959
CREATED:20260410T080846Z
LAST-MODIFIED:20260410T082310Z
UID:13034-1776248100-1776253500@crc326gaus.de
SUMMARY:Oberseminar K-Theorie
DESCRIPTION:Abstract: Recent years have seen substantial progress in understanding algebraic K-theory of singular varieties. Still\, computations of (higher) K-theory of singular varieties are quite rare\, especially in dimension >1. In this talk\, I will explain some techniques that allow one to perform computations in higher dimensions\, with a particular focus on cubic surfaces and threefolds\, where complete computations can be obtained in many cases.
URL:https://crc326gaus.de/event/oberseminar-k-theorie/
LOCATION:Mainz\, 04-426
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Georg Tamme":MAILTO:georg.tamme@uni-mainz.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260416T090000
DTEND;TZID=Europe/Berlin:20260416T110000
DTSTAMP:20260424T003959
CREATED:20260407T111339Z
LAST-MODIFIED:20260407T111339Z
UID:12996-1776330000-1776337200@crc326gaus.de
SUMMARY:Poincaré-Dualität in Charakteristik p
DESCRIPTION:Vortrag 1: Einführung – Immanuel Klevesath (Universität Heidelberg)
URL:https://crc326gaus.de/event/poincare-dualitat-in-charakteristik-p/
LOCATION:Heidelberg\, Mathematikon\, SR 8\, Heidelberg\, Germany
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260416T111500
DTEND;TZID=Europe/Berlin:20260416T124500
DTSTAMP:20260424T003959
CREATED:20260318T123713Z
LAST-MODIFIED:20260318T123753Z
UID:12848-1776338100-1776343500@crc326gaus.de
SUMMARY:The K-theory of Z/p^n
DESCRIPTION:Talk 1: Introduction\, background of K-theory and reduction steps – Marlon Kocher (Universität Heidelberg)
URL:https://crc326gaus.de/event/the-k-theory-of-z-pn/
LOCATION:Heidelberg\, Mathematikon\, SR 8 and Zoom\, INF 205\, Heidelberg\, Germany
CATEGORIES:GAUS-AG
ORGANIZER;CN="Marlon Kocher":MAILTO:mkocher@mathi.uni-heidelberg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260416T141500
DTEND;TZID=Europe/Berlin:20260416T151500
DTSTAMP:20260424T003959
CREATED:20260410T084700Z
LAST-MODIFIED:20260420T080402Z
UID:13044-1776348900-1776352500@crc326gaus.de
SUMMARY:AGTZ-Kolloquium
DESCRIPTION:Dominik Kirstein (JGU Mainz) \nThe signature as a map of cobordism categories \nAbstract: The signature is a classical invariant of manifolds\, which is a shadow of their intersection form. More refined topological indices of manifolds can be constructed by remembering the full intersection form.\nIn this talk\, I will explain how the signature has an enhancement to a multiplicative map from geometric cobordism spectra of manifolds to algebraic cobordism spectra of Hermitian forms (known as Grothendieck-Witt or L-theory). This crucially depends on the construction of the signature on the level of cobordism categories. This approach generalises and unifies various existing constructions in the literature. I will conclude by explaining some interesting applications to geometric topology\, such as a simple proof of the Weiss-Williams index theorem on characteristic classes of manifold bundles. Based on work in progress with Andrea Bianchi\, Fabian Hebestreit\, Kaif Hilman\, Christian Kremer\, Markus Land\, Thomas Nikolaus and Wolfgang Steimle.
URL:https://crc326gaus.de/event/agtz-kolloquium/
LOCATION:Mainz\, Hilbertraum (05-432)
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260416T141500
DTEND;TZID=Europe/Berlin:20260416T160000
DTSTAMP:20260424T003959
CREATED:20260421T071000Z
LAST-MODIFIED:20260421T071000Z
UID:13125-1776348900-1776355200@crc326gaus.de
SUMMARY:Symmetric Power Functoriality
DESCRIPTION:14:15 Talk 0: Alireza Shavali (Universität Heidelberg): Introduction \n  \n  \n 
URL:https://crc326gaus.de/event/symmetric-power-functoriality/
LOCATION:Heidelberg
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260416T161500
DTEND;TZID=Europe/Berlin:20260416T180000
DTSTAMP:20260424T003959
CREATED:20260413T115753Z
LAST-MODIFIED:20260413T115753Z
UID:13052-1776356100-1776362400@crc326gaus.de
SUMMARY:Oberseminar Algebra und Geometrie
DESCRIPTION:Valeria Bertini (Universita degli Studi di Milano) : Quotients of Hyperkähler manifolds \n\nAbstract: Hyperkähler manifolds have been intensively studied from the 80s on\, being building blocks of compact Kähler manifolds with trivial first Chern class; despite their natural role\, finding examples of Hyperkähler manifolds is well known to be extremely challenging. In recent years\, the focus has turned on their singular analogue\, appearing naturally from the birational geometry perspective\, and finally giving many new families of examples. A successful technique to produce singular examples is to consider (terminalizations of) quotients of smooth Hyperkähler manifolds. In this talk I will start presenting some recent results on singular Hyperkähler varieties constructed as quotients\, and then I will turn to the case the quotient is a Calabi-Yau variety. The first part is a joint work with Grossi\, Mauri and Mazzon\, and the second one is work in progress with Garbagnati.
URL:https://crc326gaus.de/event/oberseminar-algebra-und-geometrie-7/
LOCATION:Frankfurt\, Robert-Mayer-Str. 6-8\, Raum 309
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260417T133000
DTEND;TZID=Europe/Berlin:20260417T143000
DTSTAMP:20260424T003959
CREATED:20260320T133138Z
LAST-MODIFIED:20260320T133138Z
UID:12884-1776432600-1776436200@crc326gaus.de
SUMMARY:Wach modules of crystalline (phi\, Gamma)-modules over the Robba ring
DESCRIPTION:Janine Roshardt (ETH Zürich) \nBy works of Nathalie Wach and Laurent Berger there is an equivalence of Wach modules over B_Q_p^+ and crystalline p-adic representations of the absolute Galois group over Q_p. Jonathan Pottharst has stated a generalization of this equivalence to crystalline (phi\, Gamma)-modules over the Robba ring\, but no proof has appeared in the literature. In this talk\, I will explain the ideas underlying this generalization and the construction of Wach modules over the positive Robba ring.
URL:https://crc326gaus.de/event/wach-modules-of-crystalline-phi-gamma-modules-over-the-robba-ring/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260417T153000
DTEND;TZID=Europe/Berlin:20260417T170000
DTSTAMP:20260424T003959
CREATED:20260323T091332Z
LAST-MODIFIED:20260401T082348Z
UID:12888-1776439800-1776445200@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Nicolas Dupré (Wuppertal): Pro-p Iwahori-Hecke modules and singularity categories \nLet G be the group of rational points of a split reductive group over a nonarchimedean local field F of residue characteristic p\, and let H be the associated pro-p Iwahori-Hecke algebra over a field k of characteristic p. The mod-p Langlands program aims to relate the representation theory of G over k to that of the absolute Galois group of F. The representations of G in this context are however still very poorly understood. On the other hand\, the H-modules are much better understood and there even are results relating them to Galois representations. In earlier work\, we investigated the so-called Gorenstein projective model structure on the category of H-modules and its associated homotopy category Ho(H). Assuming G has semisimple rank 1\, we will explain in this talk how this category Ho(H) identifies with the singularity category of a suitable scheme parametrising Galois representations. This scheme appeared previously in work of Dotto-Emerton-Gee and of Pépin-Schmidt. After taking a suitable notion of support\, this recovers (most of) the semisimple mod-p Langlands correspondence for GL_2(Q_p). Time permitting\, we will also discuss some results about Ho(H) in higher rank. \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl)
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-37/
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:20260420T141500
DTEND;TZID=Europe/Berlin:20260420T160000
DTSTAMP:20260424T003959
CREATED:20260421T083857Z
LAST-MODIFIED:20260421T084237Z
UID:13132-1776694500-1776700800@crc326gaus.de
SUMMARY:De Rham-Witt complex
DESCRIPTION:Tom Bachmann: \nRecollections §2 Dieudonné complexes 1/2 \nDefine the de Rham complex (in general) and the completed de Rham\ncomplex (Variant 3.3.1 without the Dieudonné algebra structure). Discuss the Cartier (iso)morphism (Proposition 3.3.4 and Theorem 3.3.6).\nDefine Dieudonné complexes and their saturation: 2.1.1\, 2.1.3\, 2.1.4\, §2.2\,\n§2.3.
URL:https://crc326gaus.de/event/recollections-%c2%a72-dieudonne-complexes-1-2/
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:20260423T090000
DTEND;TZID=Europe/Berlin:20260423T110000
DTSTAMP:20260424T003959
CREATED:20260407T111507Z
LAST-MODIFIED:20260407T111507Z
UID:12998-1776934800-1776942000@crc326gaus.de
SUMMARY:Poincaré-Dualität in Charakteristik p
DESCRIPTION:Vortrag 2: Logarithmische deRham-Witt-Garben I – Nils Witt (Universität Heidelberg)
URL:https://crc326gaus.de/event/poincare-dualitat-in-charakteristik-p-2/
LOCATION:Heidelberg\, Mathematikon\, SR 8\, Heidelberg\, Germany
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260423T111500
DTEND;TZID=Europe/Berlin:20260423T124500
DTSTAMP:20260424T003959
CREATED:20260318T125016Z
LAST-MODIFIED:20260318T130750Z
UID:12851-1776942900-1776948300@crc326gaus.de
SUMMARY:The K-theory of Z/p^n
DESCRIPTION:Talk 2: Prismatic cohomology relative to δ-rings – \nMarvin Schneider/Rustam Steingart (Universität Heidelberg)
URL:https://crc326gaus.de/event/the-k-theory-of-z-pn-2/
LOCATION:Heidelberg\, Mathematikon\, SR 8 and Zoom\, INF 205\, Heidelberg\, Germany
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260423T141500
DTEND;TZID=Europe/Berlin:20260423T151500
DTSTAMP:20260424T003959
CREATED:20260416T084425Z
LAST-MODIFIED:20260420T080323Z
UID:13089-1776953700-1776957300@crc326gaus.de
SUMMARY:AGTZ Kolloquium
DESCRIPTION:Kaif Hilmann (Uni Bonn) \nTitel: Equivariant localizing motives for finite groups and applications \nAbstract: In this talk\, I will give a proposal for a definition of genuine equivariant lozalizing motives for finite groups G. Using isotropy separation arguments on equivariant cubes and the recent insights of Ramzi-Sosnilo-Winges\, we use this version of motives to enhance the algebraic K-theory functor with the structure of multiplicative norms. \nAmong other things\, we use our results to give a new and much simplified proof that K-theory admits polynomial functoriality\, first proved in a celebrated paper of Barwick-Glasman-Mathew-Nikolaus. Time permitting\, we will also discuss other applications such as constructing an equivariant Dennis trace map and showing that all genuine G-spectra are the K-theory of a G-stable category. This reports on joint work with Maxime Ramzi.
URL:https://crc326gaus.de/event/agtz-kolloqium/
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:20260423T141500
DTEND;TZID=Europe/Berlin:20260423T160000
DTSTAMP:20260424T003959
CREATED:20260421T071309Z
LAST-MODIFIED:20260421T071309Z
UID:13127-1776953700-1776960000@crc326gaus.de
SUMMARY:Symmetric Power Functoriality
DESCRIPTION:14:15 Talk 1:  Unitary Groups \n  \n  \n 
URL:https://crc326gaus.de/event/symmetric-power-functoriality-2/
LOCATION:Heidelberg
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260424T133000
DTEND;TZID=Europe/Berlin:20260424T143000
DTSTAMP:20260424T003959
CREATED:20260320T134659Z
LAST-MODIFIED:20260320T134659Z
UID:12886-1777037400-1777041000@crc326gaus.de
SUMMARY:Duality for the condensed cohomology of the Weil group of a p-adic field
DESCRIPTION:Marco Artusa (CIRM (Luminy) and I2M (Marseille)) \nDuality theorems are among the central results in arithmetic geometry. For $p$-adic fields\, the earliest example is due to Tate\, dealing with Galois cohomology of finite Galois modules. To extend this result to more general coefficients\, one is forced to modify the original cohomology groups. This underlines some shortcomings of Galois cohomology\, such as the lack of a natural topology on cohomology groups. In this talk\, we build a new topological cohomology theory for p-adic fields\, thanks to the Weil group and Condensed Mathematics. Moreover\, we see how to use this cohomology theory to extend Tate’s result to more general topological coefficients. This new duality takes the form of a Pontryagin duality between locally compact abelian groups. As a particular case\, one gets the reciprocity isomorphisms of local class field theory “à la Weil”\, which identifies the units of a $p$-adic field and the abelianised Weil group. One could try to apply similar techniques to higher local fields. Inspired by Kato’s work\, the hope is to obtain a condensed-Weil version of higher local class field theory\, which would identify $d$-th Milnor $K$-theory of a higher local field with its abelianised Weil group.
URL:https://crc326gaus.de/event/duality-for-the-condensed-cohomology-of-the-weil-group-of-a-p-adic-field/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260424T140000
DTEND;TZID=Europe/Berlin:20260424T160000
DTSTAMP:20260424T003959
CREATED:20260414T084437Z
LAST-MODIFIED:20260415T110734Z
UID:13056-1777039200-1777046400@crc326gaus.de
SUMMARY:Variation of crepant resolutions of Kleinian singularities
DESCRIPTION:The McKay correspondence establishes a strong relationship between the classical minimal resolution and the standard orbifold resolution of a Kleinian surface singularity. Based on joint work with Ruth Wye\, I will explain how the McKay correspondence extends to a larger class of crepant stacky resolutions of the singularity\, and how their Hilbert schemes of points are related through variation of GIT quotients (VGIT). Time permitting\, I will also sketch some recent ideas from work in progress with Austin Hubbard on how to relate the resolutions themselves via VGIT by taking into account the variation of monoidal structures on their mutual derived category.
URL:https://crc326gaus.de/event/variation-of-crepant-resolutions-of-kleinian-singularities/
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:20260424T153000
DTEND;TZID=Europe/Berlin:20260424T170000
DTSTAMP:20260424T003959
CREATED:20260323T091434Z
LAST-MODIFIED:20260323T091843Z
UID:12890-1777044600-1777050000@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Lucas Gerth (IMJ Paris): Moduli spaces of analytic p-divisible groups \nAbstract: We prove a classification of families of analytic p-divisible groups on adic spaces S over Qp in terms of Hodge–Tate triples on S\, generalizing a theorem of Fargues. From this\, for S a perfectoid space\, we construct an analytic Dieudonné theory with values in mixed characteristic Shtukas over the Fargues–Fontaine disc. As applications\, we realize the local Shimura varieties of EL and PEL type of Scholze–Weinstein as moduli spaces of analytic p-divisible groups with framed universal cover\, and we reinterpret the Hodge–Tate period map of Scholze in terms of topologically p-torsion subgroups of abelian varieties. \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl)
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-38/
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:20260427T101500
DTEND;TZID=Europe/Berlin:20260427T114500
DTSTAMP:20260424T003959
CREATED:20260421T084950Z
LAST-MODIFIED:20260421T091620Z
UID:13139-1777284900-1777290300@crc326gaus.de
SUMMARY:de Rham-Witt complex
DESCRIPTION:Niklas Stelzer: \n§2 Dieudonné complexes 2/2 \nSome homological algebra.\nDefine Dieudonné complexes of Cartier type (Definition 2.4.1) and discuss Theorem 2.4.2.  define completion of Dieudonné complexes (Construction 2.5.1) and strictness (Definition 2.5.4). Prove Proposition 2.6.5 in the particular case of W(M) ∗ for M∗ saturated (without mentioning strict Dieudonné towers). Cover §2.7 and §2.8.
URL:https://crc326gaus.de/event/de-rham-witt-complex/
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:20260429T160000
DTEND;TZID=Europe/Berlin:20260429T180000
DTSTAMP:20260424T003959
CREATED:20260413T115012Z
LAST-MODIFIED:20260413T120837Z
UID:13049-1777478400-1777485600@crc326gaus.de
SUMMARY:Oberseminar Algebra und Geometrie
DESCRIPTION:Michael Temkin (MPI Bonn): Wild Hurwitz spaces and level structures \n\nAbstract: Hurwitz moduli spaces of covers of curves of degree d are classical and well studied objects if one assumes that d! is invertible and hence no wild ramification phenomena occur. There were very few attempts to study the wild case. In the most important one Abramovich and Oort started with the classical space H_{2\,1\,0\,4} of double covers of P^1 ramified at four points and (following an idea of Kontsevich and Pandariphande) described its schematic closure H in the space of stable maps over Z. The result over F_2 was both strange and informative\, but lacked a modular interpretation. \nIn the first part of my talk I will describe the example of Abramovich-Oort and then tell about a work in progress of Hippold\, where a (logarithmic) modular version of compactified Hurwitz space of degree p is constructed when only (p-1)! is invertible. In particular\, this conceptually explains phenomena observed by Abramovich-Oort. In the second part I will describe another outcome of the same ideas. It was observed by Abramovich-Oort that H is the blowing up of the modular curve X(2). This is not a coincidence\, and the same ideas can be used to refine the wild level structures of Drinfeld and construct modular interpretation of the minimal modifications of the curves X(p^n) which separate ordinary branches at any supersingular point. This is a very recent work in progress and the precise description of the obtained spaces is still to be found.
URL:https://crc326gaus.de/event/oberseminar-algebra-und-geometrie-6/
LOCATION:Frankfurt\, Robert-Mayer-Str. 6-8\, Raum 308
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260430T090000
DTEND;TZID=Europe/Berlin:20260430T110000
DTSTAMP:20260424T003959
CREATED:20260407T111619Z
LAST-MODIFIED:20260407T111619Z
UID:13000-1777539600-1777546800@crc326gaus.de
SUMMARY:Poincaré-Dualität in Charakteristik p
DESCRIPTION:Vortrag 3: Logarithmische deRham-Witt-Garben II – tba
URL:https://crc326gaus.de/event/poincare-dualitat-in-charakteristik-p-3/
LOCATION:Heidelberg\, Mathematikon\, SR 8\, Heidelberg\, Germany
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260430T111500
DTEND;TZID=Europe/Berlin:20260430T124500
DTSTAMP:20260424T003959
CREATED:20260318T131210Z
LAST-MODIFIED:20260318T131210Z
UID:12858-1777547700-1777553100@crc326gaus.de
SUMMARY:The K-theory of Z/p^n
DESCRIPTION:Talk 3: The prismatic crystal – Marvin Schneider / Rustam Steingart (Universität Heidelberg)
URL:https://crc326gaus.de/event/the-k-theory-of-z-pn-3/
LOCATION:Heidelberg\, Mathematikon\, SR 8 and Zoom\, INF 205\, Heidelberg\, Germany
CATEGORIES:GAUS-AG
END:VEVENT
END:VCALENDAR