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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250620T153000
DTEND;TZID=Europe/Berlin:20250620T170000
DTSTAMP:20260425T144213
CREATED:20250612T122819Z
LAST-MODIFIED:20250612T122819Z
UID:11437-1750433400-1750438800@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Thiago Landim (IMJ): Weights and motives on stacks \nThe existence of a motivic t-structure is an old problem in the center of many conjectures related with algebraic cycles. Inspired by Deligne\, Bondarko defined a dual notion\, now called weight structure\, and proved Beilinson motives (and later integral cdh-motives) on nice schemes admit weight structures. In this talks\, we are going to prove the category of K-motives (modules of genuine K-theory inside motivic spectra) on tame quotient stacks\, as defined by Hoyois\, admits a well-behaved category of geometric motives and prove the existence of bounded weight structure on them. If time allows\, we are going to explain how this behaves better for Kan extended theories\, e.g. cdh-motives\, and how étale sheaves behaves even better. \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-29/
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:20250627T133000
DTEND;TZID=Europe/Berlin:20250627T143000
DTSTAMP:20260425T144213
CREATED:20250617T074911Z
LAST-MODIFIED:20250617T085007Z
UID:11442-1751031000-1751034600@crc326gaus.de
SUMMARY:Bogomolov property for Galois representations with big local image
DESCRIPTION:Andrea Conti (Heidelberg) \nAn algebraic extension of the rational numbers is said to have the Bogomolov property if the absolute logarithmic Weil height of its non-torsion elements is uniformly bounded from below. Given a continuous representation $\rho$ of the absolute Galois group $G_{\mathbb Q}$ of $\mathbb Q$\, one can ask whether the field fixed by $\mathrm{ker}(\rho)$ has the Bogomolov property (in short\, we say that $\rho$ has (B)). In a joint work with Lea Terracini\, we prove that\, if $\rho\colon G_{\mathbb Q}\to\mathrm{GL}_N(\mathbb Z_p)$ maps an inertia subgroup at $p$ surjectively onto an open subgroup of $\mathrm{GL}_N(\mathbb Z_p)$\, then $\rho$ has (B). More generally\, we show that if the image of a decomposition group at $p$ is open in the image of $G_\Q$\, plus a certain condition on the center of the image is satisfied\, then $\rho$ has (B). In particular\, no assumption on the modularity of $\rho$ is needed\, contrary to previous work of Habegger and Amoroso—Terracini.
URL:https://crc326gaus.de/event/bogomolov-property-for-galois-representations-with-big-local-image/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Gebhard B%C3%B6ckle":MAILTO:gebhard.boeckle iwr.uni-heidelberg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250627T153000
DTEND;TZID=Europe/Berlin:20250627T170000
DTSTAMP:20260425T144213
CREATED:20250618T115458Z
LAST-MODIFIED:20250623T075831Z
UID:11446-1751038200-1751043600@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Tianyi Feng (University Bonn): Metaplectic Satake with Ring Coefficients \nIn this talk we explain the statement and proof strategy of the geometric Satake equivalence for topological (aka metaplectic) coverings of reductive groups in DVR coefficients. This is joint work in progress with Yifei Zhao. \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-copy-2/
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:20250703T090000
DTEND;TZID=Europe/Berlin:20250703T100000
DTSTAMP:20260425T144213
CREATED:20250508T094848Z
LAST-MODIFIED:20250701T114617Z
UID:11263-1751533200-1751536800@crc326gaus.de
SUMMARY:Equivariant aspects of Hochschild homology
DESCRIPTION:Zhouhang Mao (University of Amsterdam) \nAbstract: Many localizing invariants\, after being applied to schemes\, are equipped with a motivic filtration whose associated graded pieces are given by cohomology theories of schemes. In this talk\, we give an equivariant aspects of two localizing invariants proposed by Kaledin\, which correspond to non-Hodge-completed derived de Rham cohomology and de Rham–Witt complex respectively. Our description adapts to prismatic cohomology as well. If time permits\, we also give an unexpected application of these considerations to prismatic logarithm.
URL:https://crc326gaus.de/event/equivariant-aspects-of-hochschild-homology/
LOCATION:Mainz\, Poissonraum (04-220)\, Staudingerweg 9\, Rheinland-Pfalz - Mainz\, 55128\, Germany
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250704T133000
DTEND;TZID=Europe/Berlin:20250704T143000
DTSTAMP:20260425T144213
CREATED:20250618T121516Z
LAST-MODIFIED:20250618T121516Z
UID:11449-1751635800-1751639400@crc326gaus.de
SUMMARY:Algebraic K-theory and the universal localising invariant
DESCRIPTION:Algebraic K-theory and the universal localising invariant \nChristoph Winges (Universität Regensburg) \nEssentially by construction\, the abelian group K_0 is the target of the universal rank function for various types of objects\, including finitely generated projective modules and perfect chain complexes. Over the last couple of decades\, it has become possible to formulate and prove a similar universal property for higher algebraic K-theory in the sense of Quillen and Waldhausen. A closer inspection of various localisation phenomena in algebraic K-theory leads to the notion of a localising invariant\, among which algebraic K-theory enjoys a similar universal property due to work of Blumberg\, Gepner and Tabuada. I will survey these results and\, as time allows\, discuss an alternative perspective on parts of this story that I obtained in recent joint work with Ramzi and Sosnilo.
URL:https://crc326gaus.de/event/algebraic-k-theory-and-the-universal-localising-invariant/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Christian Dahlhausen":MAILTO:cdahlhausen@mathi.uni-heidelberg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250704T153000
DTEND;TZID=Europe/Berlin:20250704T170000
DTSTAMP:20260425T144213
CREATED:20250630T085506Z
LAST-MODIFIED:20250630T085506Z
UID:11467-1751643000-1751648400@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Matteo Tamiozzo (Université Sorbonne Paris Nord): Towards semi-global plectic conjectures \nKnown results on the Birch and Swinnerton-Dyer conjecture for elliptic curves of analytic rank at most one over totally real fields rely on CM points on Shimura curves. After recalling this\, I will illustrate how an attempt to go beyond rank one leads to the plectic conjectures of Nekovář-Scholl for higher-dimensional quaternionic Shimura varieties. Finally\, I will present joint work in progress with Tony Feng and Mingjia Zhang aimed at proving a “semi-global” version of these conjectures. \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-31/
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:20250711T133000
DTEND;TZID=Europe/Berlin:20250711T143000
DTSTAMP:20260425T144213
CREATED:20250702T085227Z
LAST-MODIFIED:20250702T085227Z
UID:11476-1752240600-1752244200@crc326gaus.de
SUMMARY:The kernel of the adjoint exponential in Anderson $t$-modules
DESCRIPTION:The kernel of the adjoint exponential in Anderson $t$-modules \nGiacomo H. Ferraro (Universität Heidelberg) \n\nGiven an algebraically closed complete valued field $K$ over $\mathbb{F}_q$\, an Anderson $t$-module of dimension $d$ is given by the topological $\mathbb{F}_q$-vector space $K^d$\, endowed with an $\mathbb{F}_q$-linear action $\phi_t=\sum_{i\geq0}T_i\tau^i\in M_{d\times d}(K)[\tau]$\, where $\tau:K^d\to K^d$ sends $(v_1\,\dots\,v_d)$ to $(v_1^q\,\dots\,v_d^q)$.\nIn analogy with complex abelian varieties\, there is an analytic map $\exp=\sum_{i\geq0}E_i\tau^i: K^d\to K^d$—which is not necessarily surjective—such that $\phi_t\exp=\exp T_0$. \nThe adjoint exponential\, defined as the series $\exp^*:=\sum_{i\geq0}\tau^{-i}E_i^T$\, determines a (non-analytic) continuous map $K^d\to K^d$. Using the factorization properties of $K[\![x]\!]$\, Poonen proved that there is a perfect duality of topological $\mathbb{F}_q$-vector spaces $\ker(\exp)\times\ker(\exp^*)\to\mathbb{F}_q$ under the condition $d=1$. \nIn this talk\, I explain that for an arbitrary \textit{abelian} Anderson $t$-module\, we have a collection of perfect pairings $\ker(\phi_{t^n})\times\ker(\phi^*_{t^n})\to\mathbb{F}_q$\, and that we can use them to obtain a canonical generating series $(F_\phi)_c\in M_{d\times d}(K)[\![\tau^{-1}\,\tau]\!]$ for all $c\in\mathbb{F}_q(\!(t^{-1})\!)/\mathbb{F}_q(t)$. The study of the properties of $F_\phi$ allows us to prove that\, if $\exp$ is surjective\, $\ker(\exp^*)$ is compact and isomorphic to the Pontryagin dual of $\ker(\exp)$. Moreover\, we deduce an alternative explicit description of the Hartl–Juschka pairing\, obtained by Gazda and Maurischat in a recent preprint.
URL:https://crc326gaus.de/event/the-kernel-of-the-adjoint-exponential-in-anderson-t-modules/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Gebhard B%C3%B6ckle":MAILTO:gebhard.boeckle iwr.uni-heidelberg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250718T133000
DTEND;TZID=Europe/Berlin:20250718T143000
DTSTAMP:20260425T144213
CREATED:20250701T093603Z
LAST-MODIFIED:20250701T093603Z
UID:11470-1752845400-1752849000@crc326gaus.de
SUMMARY:Der syntomische Logarithmus
DESCRIPTION:Der syntomische Logarithmus \nMatthias Flach (Caltech/USA) \nIn Gemeinschaftsarbeit mit A. Krause und B. Morin geben wir mit Hilfe von prismatischer Kohomologie eine neue Konstruktion der Bloch-Kato Logarithmusabbildung. Als Anwendung beweisen wir die Vermutung C_{EP} von Fontaine und Perrin-Riou für Tate-Motive über beliebigen lokalen Körpern der Charakteristik null.
URL:https://crc326gaus.de/event/der-syntomische-logarithmus/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20250718T153000
DTEND;TZID=Europe/Berlin:20250718T170000
DTSTAMP:20260425T144213
CREATED:20250623T080023Z
LAST-MODIFIED:20250623T080023Z
UID:11463-1752852600-1752858000@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Abhishek Oswal (University Freiburg): p-adic hyperbolicity of the moduli space of abelian varieties \nBy a theorem of Borel\, any holomorphic map from a complex\nalgebraic variety to the moduli space of abelian varieties (and more\ngenerally to an arithmetic variety) is in fact algebraic. A key input\nis to prove that any holomorphic map from a product of punctured disks\nto such an arithmetic variety does not have any essential\nsingularities. In this talk\, I’ll discuss a p-adic analogue of these\nresults. This is joint work with Ananth Shankar and Xinwen Zhu (with an\nappendix by Anand Patel). \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-30/
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:20250904T160000
DTEND;TZID=Europe/Berlin:20250904T170000
DTSTAMP:20260425T144213
CREATED:20251020T075530Z
LAST-MODIFIED:20251020T075530Z
UID:11987-1757001600-1757005200@crc326gaus.de
SUMMARY:tba
DESCRIPTION:International Seminar on Automorphic Forms \nZiqi Guo ( Peking University) tba \n  \nhttps://tu-darmstadt.zoom.us/j/68048280736 \nThe password is the first Fourier coefficient of the modular j-function (as digits)
URL:https://crc326gaus.de/event/tba-144/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Claire Burrin":MAILTO:claire.burrin@math.uzh.ch
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20251017T133000
DTEND;TZID=Europe/Berlin:20251017T150000
DTSTAMP:20260425T144213
CREATED:20250916T124552Z
LAST-MODIFIED:20250916T124552Z
UID:11688-1760707800-1760713200@crc326gaus.de
SUMMARY:Solid Locally Analytic Representations in Mixed Characteristic
DESCRIPTION:Dr. Gal Porat (Einstein Institute of Mathematics\, Hebrew University of Jerusalem) \nAbstract:\nLocally analytic representations of p-adic Lie groups with Q_p coefficients are powerful tools in p-adic Hodge theory and the p-adic Langlands program. This perspective reveals important differential structures\, such as the Sen and Casimir operators.\nA few years ago\, Rodrigues Jacinto and Rodriguez Camargo developed a “solid” version of this theory using the language of condensed mathematics\, which provides more robust homological tools (comparison theorems\, spectral sequences…) for studying these representations.\nThis talk will present ongoing work that extends this solid theory to a much broader class of mixed characteristic coefficients\, such as F_p((X)) or Z_p[[X]]<p/x>\, as well as semilinear representations. I will conclude by exploring how these ideas relate to mixed characteristic phenomena in p-adic Hodge theory and the Langlands program.
URL:https://crc326gaus.de/event/solid-locally-analytic-representations-in-mixed-characteristic/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20251024T133000
DTEND;TZID=Europe/Berlin:20251024T150000
DTSTAMP:20260425T144213
CREATED:20251017T131844Z
LAST-MODIFIED:20251017T133629Z
UID:11957-1761312600-1761318000@crc326gaus.de
SUMMARY:Some cases of cube sum problem
DESCRIPTION:Dipramit Majumdar (IIT Madras / Universität Heidelberg) \nAbstract: An integer n is said to be a rational cube sum or simply a cube sum if n can be written as a sum of cubes of two rational numbers. For example\, 6 = (17/21)^3+ (37/21)^3. A cube-free integer n > 2 is a cube sum if and only if the elliptic curve y^2=x^3-432n^2 has infinitely many solutions over the rational numbers. A recent result of Alpöge-Bhargava-Shnidman-Burungale-Skinner shows that a positive proportion of integers are cube sums and a positive proportion of integers are not. \nWe will discuss the cube sum problem for some special family of integers. This talk is based on joint works with De\, Jha\, Mondal\, Shingavekar and Sury.
URL:https://crc326gaus.de/event/some-cases-of-cube-sum-problem/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20251024T153000
DTEND;TZID=Europe/Berlin:20251024T170000
DTSTAMP:20260425T144213
CREATED:20250915T102833Z
LAST-MODIFIED:20250915T102833Z
UID:11619-1761319800-1761325200@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Michael Rapoport (University Bonn): Toric schemes and integral models of Shimura varieties \nThe modular curve with Gamma0(p)$-level structure has a beautiful integral model over BZp\, and generalizations of this model to any Shimura variety with p-parahoric level have been constructed in the last 30 years. When passing from Gamma0(p)-level to Gamma1(p)-level\, the situation changes drastically. In the talk I will explain a general method that potentially allows to deal with such level structures. The method is based on the construction of torus embeddings of the maximal torus of a reductive group scheme. Joint work with G. Pappas. \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl)
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-241025/
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:20251107T153000
DTEND;TZID=Europe/Berlin:20251107T170000
DTSTAMP:20260425T144213
CREATED:20250915T103631Z
LAST-MODIFIED:20251024T130422Z
UID:11623-1762529400-1762534800@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Fei Ren (Bergische Universität Wuppertal): Coherent Six-Functor Formalisms: Pro vs Solid \nIn the classical theory for coherent sheaves\, the only missing piece in the Grothendieck\nsix-functor formalism picture is j! for an open immersion j. Towards fixing this gap\, Deligne\nprovided a construction of j! by extending the sheaf class to pro sheaves\, while Clausen-\nScholze provided another solution by extending the sheaf class to solid modules.\nIn this talk\, I will explain how Deligne’s construction coincides with the Clausen-Scholze construction via a natural functor\, whose restriction to the full subcategory of Mittag-Leffler pro-systems is fully faithful. \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl)
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-071125/
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:20251118T150000
DTEND;TZID=Europe/Berlin:20251118T160000
DTSTAMP:20260425T144213
CREATED:20251020T075708Z
LAST-MODIFIED:20251111T070605Z
UID:11986-1763478000-1763481600@crc326gaus.de
SUMMARY:The Gross-Zagier formula on singular moduli for Shimura curves
DESCRIPTION:International Seminar on Automorphic Forms \nAndrew Phillips (College of Idaho): The Gross-Zagier formula on singular moduli for Shimura curves \nThe Gross-Zagier formula on singular moduli\, which gives a formula for the prime factorization of differences of j-values\, can be seen as a calculation of the intersection multiplicity of two CM divisors on the integral model of a modular curve. We will discuss a generalization of this result to a Shimura curve. \nhttps://tu-darmstadt.zoom.us/j/68048280736 \nThe password is the first Fourier coefficient of the modular j-function (as digits)
URL:https://crc326gaus.de/event/tba-145/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Claire Burrin":MAILTO:claire.burrin@math.uzh.ch
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20251121T153000
DTEND;TZID=Europe/Berlin:20251121T170000
DTSTAMP:20260425T144213
CREATED:20250915T103808Z
LAST-MODIFIED:20251024T130535Z
UID:11627-1763739000-1763744400@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Ioannis Zachos (University Münster): On integral models for some ramified unitary Shimura varieties \nLocal models of Shimura varieties are projective flat schemes over the spectrum of a discrete valuation ring. The importance of local models lies in the fact that under some assumptions they model the singularities that arise in the reduction modulo p of Shimura varieties. In this talk\, we will first introduce the notion of local models and certain variants of them for some ramified unitary Shimura varieties. Building on this\, we will resolve the singularities of these models\, leading to regular integral models for the corresponding Shimura varieties. In the end we will discuss the Bruhat-Tits stratification of the associated Rapoport-Zink spaces. \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl)
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-211125/
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:20251125T150000
DTEND;TZID=Europe/Berlin:20251125T160000
DTSTAMP:20260425T144213
CREATED:20251020T075830Z
LAST-MODIFIED:20251121T074726Z
UID:11985-1764082800-1764086400@crc326gaus.de
SUMMARY:Refined equidistribution of Hecke points and cryptography
DESCRIPTION:International Seminar on Automorphic Forms \nRadu Toma ( Institut de mathémathiques de Jussieu): Refined equidistribution of Hecke points and cryptography \nA classic theorem states that\, fixing a Euclidean lattice L\, its sublattices of large index equidistribute in the space of lattices. The literature leaves open the question: how does the rate of equidistribution depend on L? In joint work with de Boer\, Page\, and Wesolowski\, we answer this using automorphic theory and geometry of numbers. Motivated by lattice-based cryptography\, we apply the result to show that a computational problem called SIVP is as hard for Haar random module lattices as it is in the worst case. \nhttps://tu-darmstadt.zoom.us/j/68048280736 \nThe password is the first Fourier coefficient of the modular j-function (as digits)
URL:https://crc326gaus.de/event/tba-146/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Claire Burrin":MAILTO:claire.burrin@math.uzh.ch
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20251128T153000
DTEND;TZID=Europe/Berlin:20251128T170000
DTSTAMP:20260425T144213
CREATED:20250915T103944Z
LAST-MODIFIED:20251111T081806Z
UID:11629-1764343800-1764349200@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Juan Esteban Rodríguez Camargo (MPI Bonn): Cartier duality for gerbes of vector bundles \nUsing the theory of abstract six functor formalisms of\nanalytic stacks\, I will explain a general Cartier duality for gerbes\nof vector bundles in different algebraic and analytic setups. As an\napplication\, admitting some foundational aspects of the theory of the\nanalytic Hodge-Tate stack (joint with Anschütz\, Le Bras and Scholze)\,\none can deduce a Cartier duality between the categories of\nquasi-coherent sheaves of the analytic\nHodge-Tate stack and weight one modules on the Simpson gerbe of Bhatt-Zhang. \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl)
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-281125/
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:20251202T160000
DTEND;TZID=Europe/Berlin:20251202T170000
DTSTAMP:20260425T144213
CREATED:20251201T122325Z
LAST-MODIFIED:20251201T122325Z
UID:12287-1764691200-1764694800@crc326gaus.de
SUMMARY:From Asai to Triple Product: Euler Systems and p-adic L-functions
DESCRIPTION:International Seminar on Automorphic Forms \nGiada Grossi (Paris 13) : From Asai to Triple Product: Euler Systems and p-adic L-functions \nhttps://tu-darmstadt.zoom.us/j/68048280736 \nThe password is the first Fourier coefficient of the modular j-function (as digits)
URL:https://crc326gaus.de/event/from-asai-to-triple-product-euler-systems-and-p-adic-l-functions/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Claire Burrin":MAILTO:claire.burrin@math.uzh.ch
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20251203T160000
DTEND;TZID=Europe/Berlin:20251203T170000
DTSTAMP:20260425T144213
CREATED:20251007T145604Z
LAST-MODIFIED:20251127T095230Z
UID:11823-1764777600-1764781200@crc326gaus.de
SUMMARY:Oberseminar Algebra und Geometrie
DESCRIPTION:Kay Rülling (Universität Wuppertal): Tame cohomology of the structure sheaf in mixed characteristic \nAbstract:\nThis is joint work in progress with Alberto Merici and Shuji Saito.\nLet R be a complete discrete valuation ring of mixed characteristic with fraction field K.\nWe show that the tame cohomology of Hübner-Schmidt on smooth K-schemes relative to R of (a twist of) the structure sheaf is \A^1-invariant and is a finite R-module up to bounded torsion.\nThis induces a canonical R-lattice in the cohomology of the structure sheaf of smooth proper K-schemes.\nIf X has a regular model over R and resolutions of singularities in mixed characteristic hold\, then this lattice would be the cohomology of this regular model. The interesting point is that we get the existence of such a lattice also in case X has no regular model and without using resolutions.\nTo this end we use classical results by Bartenwerfer and van der Put in rigid geometry.
URL:https://crc326gaus.de/event/oberseminar-algebra-und-geometrie-2/
LOCATION:Frankfurt\, Robert-Mayer-Str. 6-8\, Raum 309
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20251205T133000
DTEND;TZID=Europe/Berlin:20251205T150000
DTSTAMP:20260425T144213
CREATED:20251202T074025Z
LAST-MODIFIED:20251202T074025Z
UID:12293-1764941400-1764946800@crc326gaus.de
SUMMARY:On the distribution of supersingular primes of abelian varieties and K3 surfaces
DESCRIPTION:Prof. Dr. Chun Yin Hui (The University of Hongkong) \nAbstract: Let X be an abelian variety or a K3 surface defined over a number field K. We prove that the density of the supersingular primes of X/K is zero if X is non-CM. By applying an effective Chebotarev density theorem of Serre\, we obtain asymptotic upper bounds of the counting function for these supersingular primes. \n 
URL:https://crc326gaus.de/event/on-the-distribution-of-supersingular-primes-of-abelian-varieties-and-k3-surfaces/
LOCATION:Heidelberg\, MATHEMATIKON\, SR A\, Deutschland
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Gebhard B%C3%B6ckle":MAILTO:gebhard.boeckle iwr.uni-heidelberg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20251205T153000
DTEND;TZID=Europe/Berlin:20251205T170000
DTSTAMP:20260425T144213
CREATED:20250915T104108Z
LAST-MODIFIED:20251111T081722Z
UID:11631-1764948600-1764954000@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Felix Röhrle (Universität Tübingen): Quadratically enriched plane curve counting via tropical geometry \nConsider the classical problem in enumerative geometry of counting rational plane curves through a fixed configuration of points. The problem may be considered over any base field and the point conditions might be scheme theoretic points. Recently\, Kass–Levine–Solomon–Wickelgren have used techniques from $\mathbb{A}^1$-homotopy theory to define an enumerative invariant for this problem which is defined over a large class of possible base fields. This new theory generalizes Gromov-Witten invariants (base field = complex numbers) and Welschinger invariants (base field = real numbers) simultaneously. In this talk I will present a tropical correspondence theorem\, which allows to effectively compute these new invariants. This is joint work with Andrès Jaramillo-Puentes\, Hannah Markwig\, and Sabrina Pauli. \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl)
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-051225/
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:20251209T150000
DTEND;TZID=Europe/Berlin:20251209T160000
DTSTAMP:20260425T144213
CREATED:20251020T080004Z
LAST-MODIFIED:20251205T082856Z
UID:11979-1765292400-1765296000@crc326gaus.de
SUMMARY:Kudla's conjecture in cohomology for unitary Shimura varieties
DESCRIPTION:International Seminar on Automorphic Forms \nFrançois Greer (Michigan State University): Kudla’s conjecture in cohomology for unitary Shimura varieties \nThe generating series for special cycles in a unitary Shimura variety $X$ associated to a Hermitian lattice of signature $(1\,n)$ is a modular form. Such a Shimura variety has a unique toroidal compactification\, and one can consider the closures of the special cycles there. We prove that for codimension up to the middle\, the generating series for these closures is quasi-modular\, and explain how to make boundary corrections to restore modularity\, answering a question of Kudla. This is based on joint work with Salim Ta \nhttps://tu-darmstadt.zoom.us/j/68048280736 \nThe password is the first Fourier coefficient of the modular j-function (as digits)
URL:https://crc326gaus.de/event/tba-147/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Claire Burrin":MAILTO:claire.burrin@math.uzh.ch
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20251211T153000
DTEND;TZID=Europe/Berlin:20251211T163000
DTSTAMP:20260425T144213
CREATED:20251126T135839Z
LAST-MODIFIED:20251202T114220Z
UID:12256-1765467000-1765470600@crc326gaus.de
SUMMARY:Oberseminar Algebra und Geometrie
DESCRIPTION:Annalisa Grossi (Università di Bologna): In search of maximal branes on Hyper-Kähler manifolds \nAbstract: Given a holomorphic or anti-holomorphic involution on a complex variety\, the Smith-Thom inequality says that the total \mathbb{F}_2-Betti number of the fixed locus is no greater than the total \mathbb{F}_2-Betti number of the ambient variety. The involution is called maximal when the equality is achieved. On a Hyper-Kähler manifold X a holomorphic or a anti-holomorphic involution is referred to as a brane involution. While examples of non-compact hyper-Kähler manifolds admitting maximal branes are known\, the compact case is more intriguing. In particular\, although there exist some K3 surfaces admitting maximal brane involutions\, the main result that I will show you is the non-existence of maximal branes on Hyper-Kähler manifolds deformation equivalent to the Hilbert scheme of points on a K3 surface. This talk is based on a joint work and on a joint work in progress with S. Billi\, L. Fu and V. Kharlamov.
URL:https://crc326gaus.de/event/oberseminar-algebra-und-geometrie-4/
LOCATION:Frankfurt\, RM-Str. 6-8\, R. 308
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20251212T133000
DTEND;TZID=Europe/Berlin:20251212T150000
DTSTAMP:20260425T144213
CREATED:20251203T105356Z
LAST-MODIFIED:20251203T105356Z
UID:12296-1765546200-1765551600@crc326gaus.de
SUMMARY:Algebraicity of critical Hecke L-values
DESCRIPTION:Prof. Dr. Johannes Sprang (Universität Duisburg-Essen) \nEuler’s beautiful formula for the values of the Riemann zeta function at the positive even integers can be seen as the starting point of the investigation of special values of L-functions.\nIn particular\, Euler’s result shows that all critical zeta values are rational up to multiplication with a particular period\, here the period is a power of 2πi. Conjecturally this is expected to hold for all critical L-values of motives. In this talk\, I will explain a joint result with Guido Kings on the algebraicity of critical Hecke L-values up to explicit periods for totally imaginary fields. As an application\, I will discuss the construction of p-adic L-functions for such fields. \n 
URL:https://crc326gaus.de/event/algebraicity-of-critical-hecke-l-values/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Christian Dahlhausen":MAILTO:cdahlhausen@mathi.uni-heidelberg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20251219T153000
DTEND;TZID=Europe/Berlin:20251219T170000
DTSTAMP:20260425T144213
CREATED:20250915T104643Z
LAST-MODIFIED:20250915T104643Z
UID:11635-1766158200-1766163600@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Cookies & Math \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl)
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-191225/
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:20260109T133000
DTEND;TZID=Europe/Berlin:20260109T150000
DTSTAMP:20260425T144213
CREATED:20251212T110218Z
LAST-MODIFIED:20260102T141408Z
UID:12386-1767965400-1767970800@crc326gaus.de
SUMMARY:p-adic periods of 1-motives
DESCRIPTION:Felix Sefzig (Universität Zürich) \nI will present a new construction of the p-adic de Rham comparison isomorphism for 1-motives. As an application\, I will show how this approach leads to explicit computations of the periods of elliptic and hyperelliptic curves. In particular\, this provides concrete\, non-trivial examples of so-called motivic periods.
URL:https://crc326gaus.de/event/tba-151/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Christian Dahlhausen":MAILTO:cdahlhausen@mathi.uni-heidelberg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260113T160000
DTEND;TZID=Europe/Berlin:20260113T170000
DTSTAMP:20260425T144213
CREATED:20251020T080138Z
LAST-MODIFIED:20251209T073333Z
UID:11980-1768320000-1768323600@crc326gaus.de
SUMMARY:Jacobi forms and modular differential equations
DESCRIPTION:International Seminar on Automorphic Forms \nDmitrii Adler (MPIM Bonn):  Jacobi forms and modular differential equations \nThe Serre derivative is a differential operator that raises the weight of a modular form by 2. One possible generalization of the Serre derivative to the setting of Jacobi forms is a modification of the heat operator involving the quasi-modular Eisenstein series E_2. In this talk\, I will present an approach to constructing modular differential equations for Jacobi forms with respect to this operator. This method makes it possible to describe solutions of first- and second-order modular differential equations (Kaneko–Zagier type equations)\, to construct higher-order differential equations\, and to obtain applications to the elliptic genus of Calabi–Yau manifolds. This is joint work with Valery Gritsenko. \nhttps://tu-darmstadt.zoom.us/j/68048280736 \nThe password is the first Fourier coefficient of the modular j-function (as digits)
URL:https://crc326gaus.de/event/tba-148/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Claire Burrin":MAILTO:claire.burrin@math.uzh.ch
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260116T111500
DTEND;TZID=Europe/Berlin:20260116T124500
DTSTAMP:20260425T144213
CREATED:20260109T113557Z
LAST-MODIFIED:20260109T113557Z
UID:12529-1768562100-1768567500@crc326gaus.de
SUMMARY:Picard modular forms and integrable systems
DESCRIPTION:Fabien Cléry (Loughborough University) \nWe will explain how certain integrable systems can be solved\nby using Picard modular forms. This is joint work with E. Ferapontov\,\nA. Odesskii and D. Zagier.
URL:https://crc326gaus.de/event/picard-modular-forms-and-integrable-systems/
LOCATION:Heidelberg\, Mathematikon\, SR 8\, Heidelberg\, Germany
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Georg Bernhard Oberdieck":MAILTO:georgo@uni-heidelberg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260116T133000
DTEND;TZID=Europe/Berlin:20260116T150000
DTSTAMP:20260425T144213
CREATED:20260109T133323Z
LAST-MODIFIED:20260109T133323Z
UID:12532-1768570200-1768575600@crc326gaus.de
SUMMARY:Jacobians with Complex Multiplication
DESCRIPTION:Ben Moonen (Radboud University Nijmegen) \nAn old conjecture by Coleman predicts that if we fix a sufficiently large integer g\, there exist only finitely many (smooth projective) complex curves of genus g whose Jacobians are abelian variety of CM type. Coleman originally conjectured this to be true for g>3; there are\, however\, counterexamples for g up to 7. I will explain how\, through a programme initiated by Oort\, this problem relates to the question of whether in the moduli space of abelian varieties there exists positive dimensional special subvarieties (Shimura varieties) that are contained in the Torelli locus. The goal of my talk is to explain what we currently know about this problem\, and what not.
URL:https://crc326gaus.de/event/jacobians-with-complex-multiplication/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
END:VEVENT
END:VCALENDAR