BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CRC 326 - GAUS - ECPv6.16.3//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-ORIGINAL-URL:https://crc326gaus.de
X-WR-CALDESC:Events for CRC 326 - GAUS
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Europe/Berlin
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20210328T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20211031T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20220327T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20221030T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20230326T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20231029T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20240331T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20241027T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20221215T140000
DTEND;TZID=Europe/Berlin:20221215T160000
DTSTAMP:20260531T230840
CREATED:20221012T071938Z
LAST-MODIFIED:20221208T142813Z
UID:3768-1671112800-1671120000@crc326gaus.de
SUMMARY:Residual intersections and Witt-valued Euler numbers
DESCRIPTION:Tom Bachmann \nReport on joint work with Kirsten Wickelgren. Let K = J:I be a (local) residual intersection satisfying appropriate hypotheses. We show that the conormal module J/JK is free and use this to exhibit a *canonical* isomorphism between I^{t+1}/JI^t twisted by the determinant of J/KJ and the canonical module (the derived dual of R/K). Using this we determine the canonical modules of global residual intersections. As an application we show how to interpret the van Straten–Warmt form of an almost complete intersection as arising via algebraic surgery from the Koszul complex. This yields a new local formula in quadratic enumerative geometry.
URL:https://crc326gaus.de/event/t-b-a-3/
LOCATION:Mainz\, Hilbertraum (05-432)
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20221216T133000
DTEND;TZID=Europe/Berlin:20221216T150000
DTSTAMP:20260531T230840
CREATED:20221202T152055Z
LAST-MODIFIED:20221202T152055Z
UID:4476-1671197400-1671202800@crc326gaus.de
SUMMARY:A motivic integral p-adic cohomology
DESCRIPTION:Alberto Merici (Oslo) \nAbstract: We use the theory of logarithmic motives to construct an integral p-adic  cohomology theory for smooth varieties over a field k of characteristic p\, that factors through the category of Voevodsky (effective) motives. If k satisfies resolutions of singularities\, we will show that it is indeed a “good” integral p-adic cohomology and it agrees to a similar one constructed by Ertl\, Shiho and Sprang: we will then deduce many interesting motivic properties.\nIf time permits\, we will explain how the above construction suggests a strategy to prove a conjecture of Hübner and Schmidt on tame motivic cohomology.
URL:https://crc326gaus.de/event/a-motivic-integral-p-adic-cohomology/
LOCATION:Heidelberg\, Mathematikon\, SR C
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20221216T140000
DTEND;TZID=Europe/Berlin:20221216T170000
DTSTAMP:20260531T230840
CREATED:20221209T083709Z
LAST-MODIFIED:20221209T095342Z
UID:4589-1671199200-1671210000@crc326gaus.de
SUMMARY:Point-set topology methods in the theory of v-sheaves and diamonds
DESCRIPTION:Seminar on Arithmetic Geometry \nIn this lecture series we aim to introduce the audience to the theory of kimberlites and its applications. The theory of kimberlites attempts to single out within Scholze’s category of v-sheaves those objects that “behave” as formal schemes. In this way\, kimberlites provide well-behaved candidates for integral models of locally spatial diamonds. In the first two talks we discuss the foundations of the theory\, and in the second two talks we discuss its applications to study moduli spaces of B_dR-lattices and moduli spaces of p-adic shtukas. \nTalk 4: The purpose of this talk is to discuss the moduli of p-adic shtukas. We prove these moduli spaces are smelted kimberlites and single out the difficulties to proving that they are kimberlites. We discuss the v-sheaf theoretic “local diagram correspondence” for tubular neighborhoods relating moduli spaces of shtukas to moduli of B^+_dR-lattices. We prove they are unibranch. Finally we expalin how this is used to compute their connected components. \nIan Gleason (Berkeley\, USA) \nZoom (Meeting-ID: 635 7328 0984\, Password: smallest six digit prime)
URL:https://crc326gaus.de/event/point-set-topology-methods-in-the-theory-of-v-sheaves-and-diamonds-4/
LOCATION:Darmstadt\, Room 401 and Zoom\, Schlossgartenstraße 7\, Darmstadt\, 64289\, Germany
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20221220T160000
DTEND;TZID=Europe/Berlin:20221220T170000
DTSTAMP:20260531T230840
CREATED:20221108T130945Z
LAST-MODIFIED:20221213T101233Z
UID:4206-1671552000-1671555600@crc326gaus.de
SUMMARY:Distributions of Manin's iterated integrals
DESCRIPTION:International Seminar on Automorphic Forms\n \nWe recall the definition of Manin’s iterated integrals of a given length. We then explain how these generalise modular symbols and certain aspects of the theory of multiple zeta-values. In length one and two we determine the limiting distribution of these iterated integrals. Maybe surprisingly\, even if we can compute all moments also in higher length we cannot in general determine a distribution for length three or higher. This is joint work with Y. Petridis and with N. Matthes. \nMorten Risager (University of Copenhagen) \nYou can join the Zoom meeting at https://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/international-seminar-on-automorphic-forms-tba-6/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Claire Burrin":MAILTO:claire.burrin@math.uzh.ch
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20221222T140000
DTEND;TZID=Europe/Berlin:20221222T160000
DTSTAMP:20260531T230840
CREATED:20221116T085525Z
LAST-MODIFIED:20221207T085757Z
UID:4324-1671717600-1671724800@crc326gaus.de
SUMMARY:Homotopical characterization of exceptional complete intersection maps
DESCRIPTION:Janine Letz \nA surjective map between commutative noetherian local rings (R\, m) → S is exceptional complete intersection (eci) if its kernel is generated by a regular sequence that is part of a minimal generating set of m. I present two characterizations of eci maps: First\, a map is eci if and only if the truncated Atiyah class vanishes at the residue field. This establishes a second characterization in terms of the lattices of thick subcategories of complexes of finite length homology. This is joint work with Srikanth Iyengar\, Jian Liu and Josh Pollitz.
URL:https://crc326gaus.de/event/tba-29/
LOCATION:Mainz\, Hilbertraum (05-432)
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230110T090000
DTEND;TZID=Europe/Berlin:20230110T100000
DTSTAMP:20260531T230840
CREATED:20221108T131141Z
LAST-MODIFIED:20221213T101351Z
UID:4208-1673341200-1673344800@crc326gaus.de
SUMMARY:Deligne-Mostow theory and beyond
DESCRIPTION:International Seminar on Automorphic Forms \nBall quotients have been studied extensively in algebraic geometry from the aspect of moduli spaces\, and in number theory with emphasis on the relation with modular forms. The Deligne-Mostow theory gives them moduli interpretation through the isomorphism between the Baily-Borel compactifications of them and certain GIT quotients.\nIn this talk\, I will discuss whether the isomorphisms given by the Deligne-Mostow theory are lifted to other compactifications from the viewpoint of modular forms and pursue “better” compactifications. Moreover\, I will also clarify their connection with the recent development in the minimal model program. This work is based on a joint work with Klaus Hulek (Leibniz University Hannover). \nYota Maeda (Kyoto University) \nYou can join the Zoom meeting at https://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/international-seminar-on-automorphic-forms-tba-7/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Claire Burrin":MAILTO:claire.burrin@math.uzh.ch
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230111T160000
DTEND;TZID=Europe/Berlin:20230111T170000
DTSTAMP:20260531T230840
CREATED:20220810T084754Z
LAST-MODIFIED:20230109T100007Z
UID:3460-1673452800-1673456400@crc326gaus.de
SUMMARY:Gauged Gromov-Witten theory and affine grassmannians
DESCRIPTION:Oberseminar Algebra und Geometrie \nRescheduled to 10.01.2023\, 4pm\, room 308  \nAndres Fernandez Herrero (Columbia University) \nAbstract: Objects of interest in algebraic geometry (e.g. curves\, vector bundles\, or differential equations) are often parametrized by algebraic varieties\, called moduli spaces. In this talk I will discuss some recent techniques developed to construct moduli spaces for a broad range of moduli problems which are related to the moduli of vector bundles on a fixed compact Riemann surface.\nWith time permitting\, I will also try to explain what it means to count vector bundles on compact Riemann surfaces\, and why such counts are given by combinations of certain special values of transcendental functions. This talk is based on joint work with Daniel Halpern-Leistner. \n 
URL:https://crc326gaus.de/event/tba-11/
LOCATION:Frankfurt\, Robert-Mayer-Str. 10\, Raum 711 groß
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230113T133000
DTEND;TZID=Europe/Berlin:20230113T150000
DTSTAMP:20260531T230840
CREATED:20221214T125541Z
LAST-MODIFIED:20221214T125541Z
UID:4625-1673616600-1673622000@crc326gaus.de
SUMMARY:The Picard-Lefschetz formula for normal crossings
DESCRIPTION:Moritz Kerz (Universität Regensburg) \nAbstract: In the study of semi-stable degeneration of Lefschetz pencils one is led to a generalization of the classical Picard-Lefschetz formula for certain perverse sheaves on normal crossing spaces. In the talk I will recall the formalism of nearby cycle and vanishing cycle functors and I will explain how Hodge theory allows one to obtain the normal crossing Picard-Lefschetz formula. Joint work with A. Beilinson and H. Esnault.
URL:https://crc326gaus.de/event/the-picard-lefschetz-formula-for-normal-crossings/
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:20230117T090000
DTEND;TZID=Europe/Berlin:20230117T100000
DTSTAMP:20260531T230840
CREATED:20221108T131521Z
LAST-MODIFIED:20230109T081927Z
UID:4210-1673946000-1673949600@crc326gaus.de
SUMMARY:Sup-norms of automorphic forms on average
DESCRIPTION:International Seminar on Automorphic Forms \nBounding the sup-norms of automorphic forms has been a very active area in research in recent times.\nWhereas lot of nice results are known for small rank groups\, like GL(2)\, almost nothing is known for\, say\, Siegel or Jacobi modular forms of higher degrees. In this talk we aim to discuss some conjectures and results in this area. We use either the theory of Poincare series or averages of central values of L-functions to tackle this problem. Our methods have the benefit of having a hands-on approach and fits into many situations.\nSoumya Das (Indian Institute of Science) \nYou can join the Zoom meeting at https://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/international-seminar-on-automorphic-forms-tba-8/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Claire Burrin":MAILTO:claire.burrin@math.uzh.ch
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230118T160000
DTEND;TZID=Europe/Berlin:20230118T170000
DTSTAMP:20260531T230840
CREATED:20221004T133821Z
LAST-MODIFIED:20230110T102733Z
UID:3715-1674057600-1674061200@crc326gaus.de
SUMMARY:Expanded degenerations for Hilbert schemes of points.
DESCRIPTION:Oberseminar Algebra und Geometrie \nCalla Tschanz (University of Bath) \nAbstract:\nLet X –> C be a projective family of surfaces over a curve with smooth generic fibre and simple normal crossing singularity in the special fibre X_0. We construct a good compactification of the moduli space of relative length n zero-dimensional subschemes on X\X_0 over C\{0}. In order to produce this compactification we study expansions of the special fibre X_0 together with a GIT stability condition\, generalising the work of Gulbrandsen-Halle-Hulek who use GIT to offer an alternative approach to the work of Li-Wu for Hilbert schemes of points on simple degenerations. We construct stacks which we prove to be equivalent to the  underlying stack of some choices of logarithmic Hilbert schemes produced by Maulik-Ranganathan.
URL:https://crc326gaus.de/event/tba-20/
LOCATION:Frankfurt\, Robert-Mayer-Str. 10\, Raum 711 groß
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230119T140000
DTEND;TZID=Europe/Berlin:20230119T160000
DTSTAMP:20260531T230840
CREATED:20221107T085125Z
LAST-MODIFIED:20221212T124637Z
UID:4157-1674136800-1674144000@crc326gaus.de
SUMMARY:The standard conjecture of Hodge type for abelian fourfolds
DESCRIPTION:Guiseppe Ancona (Strasbourg) \nLet S be a surface\, V be the Q-vector space of divisors on S modulo numerical equivalence and d be the dimension of V . The intersection product defines a non degenerate quadratic form on V . The Hodge index theorem says that it is of signature (1\, d − 1). In the Sixties Grothendieck conjectured a generalization of this statement to cycles of any codimension on a variety of any dimension. In characteristic zero this conjecture is a consequence of Hodge theory but in positive characteristic almost nothing is known. Instead of studying these quadratic forms at the archimedean place we will study them at p-adic places. It turns out that this question is more tractable\, thanks to p-adic Hodge Theory. Moreover\, using classical product formulas on quadratic forms\, the p-adic result will give non-trivial informations on the archimedean place. For instance\, we will prove the original conjecture for abelian fourfolds.
URL:https://crc326gaus.de/event/the-standard-conjecture-of-hodge-type-for-abelian-fourfolds/
LOCATION:Mainz\, Hilbertraum (05-432)
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230120T133000
DTEND;TZID=Europe/Berlin:20230120T150000
DTSTAMP:20260531T230840
CREATED:20221214T125948Z
LAST-MODIFIED:20221214T125948Z
UID:4627-1674221400-1674226800@crc326gaus.de
SUMMARY:Integral p-adic cohomology for open and singular varieties
DESCRIPTION:Veronika Ertl (Universität Regensburg) \nAbstract: In this talk I will explain a joint result with Johannes Sprang and Atsushi Shiho.\nUnder certain conditions of resolutions of singularities in positive characteristic\,\nwe construct a “good” integral p-adic cohomology theory for open and singular varieties\,\nby using a version of Voevodsky’s h-topology.\nI will explain the construction and clarify in which sense our cohomology is a “good” p-adic cohomology theory.\nI will also touch on the question why a similar approach does not work in full generality without resolutions of singularities.
URL:https://crc326gaus.de/event/integral-p-adic-cohomology-for-open-and-singular-varieties-2/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230124T160000
DTEND;TZID=Europe/Berlin:20230124T170000
DTSTAMP:20260531T230840
CREATED:20221108T131957Z
LAST-MODIFIED:20230113T083616Z
UID:4212-1674576000-1674579600@crc326gaus.de
SUMMARY:Slope of Siegel modular forms: some geometric applications
DESCRIPTION:International Seminar on Automorphic Forms \nWe study the slope of modular forms on the Siegel space. We will recover known divisors of  minimal slope for $g\leq5$ and we discuss the Kodaira dimension of the moduli space of principally polarized abelian varieties $A_g$ (and eventually of the generalized Kuga’s varieties). Moreover we illustrate the cone of moving divisors on $A_g$. Partly motivated by the generalized Rankin-Cohen bracket\, we construct a non-linear holomorphic differential operator that sends Siegel modular forms to Siegel cusp forms\, and we apply it to produce new modular forms. Our construction recovers the known divisors of minimal moving slope on $A_g$ for $g\leq5$. \nRiccardo Salvati Manni (Sapienza University of Rome) \nYou can join the Zoom meeting at https://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/international-seminar-on-automorphic-forms-tba-9/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Claire Burrin":MAILTO:claire.burrin@math.uzh.ch
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230127T133000
DTEND;TZID=Europe/Berlin:20230127T150000
DTSTAMP:20260531T230840
CREATED:20230118T155149Z
LAST-MODIFIED:20230124T142517Z
UID:4758-1674826200-1674831600@crc326gaus.de
SUMMARY:Automorphisms of categories of schemes
DESCRIPTION:Remy van Dobben de Bruyn (Universität Utrecht) \nAbstract: Given two schemes S and S’\, we show that any equivalence between Sch/S and Sch/S’ comes from a unique isomorphism between S and S’. In particular\, the category of schemes does not have any nontrivial automorphisms. This eliminates all Noetherian and finite type hypotheses from a result of Mochizuki\, and answers a series of questions of Brandenburg. The methods are analogous to those in anabelian geometry (but easier)\, and this talk also serves as an introduction to those ideas for non-experts. \n 
URL:https://crc326gaus.de/event/automorphisms-of-categories-of-schemes/
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:20230127T153000
DTEND;TZID=Europe/Berlin:20230127T170000
DTSTAMP:20260531T230840
CREATED:20230124T110110Z
LAST-MODIFIED:20230124T114322Z
UID:4781-1674833400-1674838800@crc326gaus.de
SUMMARY:Motives of moduli of bundles on curves
DESCRIPTION:Seminar Arithmetic Geometry \nSimon Pepin Lehalleur (Radboud-Universiteit Nijmegen) \nAbstract: (Joint with Victoria Hoskins\, Nijmegen) Moduli spaces and stacks of bundles on smooth projective curves are basic objects of algebraic geometry and part of the geometric set-up of the Langlands program for function fields. Their cohomology is well understood in some ways and still very mysterious in others. After some recollections on Voevodsky\nmotives\, I will present several results about the motives of the moduli stack of vector bundles and the moduli spaces of semistable Higgs bundles\, expressing them in terms of the motives of powers of the base curve. I will then explain how this can combined with constructions of Maulik-Shen to prove a motivic version of the “topological mirror symmetry” connecting moduli spaces of SL_n and PGL_n-Higgs bundles. \nZoom (Meeting-ID: 635 7328 0984\, Password: smallest six digit prime) \n 
URL:https://crc326gaus.de/event/motives-of-moduli-of-bundles-on-curves/
LOCATION:Darmstadt\, Room 401 and Zoom\, Schlossgartenstraße 7\, Darmstadt\, 64289\, Germany
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230131T160000
DTEND;TZID=Europe/Berlin:20230131T170000
DTSTAMP:20260531T230840
CREATED:20221108T132141Z
LAST-MODIFIED:20230124T083330Z
UID:4214-1675180800-1675184400@crc326gaus.de
SUMMARY:Continuity and value distribution of quantum modular forms
DESCRIPTION:International Seminar on Automorphic Forms \nSandro Bettin (University of Genova) \nQuantum modular forms are functions f defined on the rationals whose period functions\, such as ψ(x):= f(x) – x-k f(-1/x) (for level 1)\, satisfy some continuity properties. In the case of k=0\, f can be interpreted as a Birkhoff sums associated with the Gauss map. In particular\, under mild hypotheses on G\, one can show convergence to a stable law. If k is non-zero\, the situation is rather different and we can show that mild conditions on psi imply that f itself has to exhibit some continuity property. Finally\, we discuss the convergence in distribution also in this case. This is a joint work with Sary Drappeau. \nYou can join the Zoom meeting at https://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/international-seminar-on-automorphic-forms-tba-10/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Claire Burrin":MAILTO:claire.burrin@math.uzh.ch
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230202T140000
DTEND;TZID=Europe/Berlin:20230202T160000
DTSTAMP:20260531T230840
CREATED:20221116T085643Z
LAST-MODIFIED:20230116T081424Z
UID:4326-1675346400-1675353600@crc326gaus.de
SUMMARY:Toroidal b-divisors and applications in differential and arithmetic geometry
DESCRIPTION:Ana Botero (Regensburg) \nWe define toroidal b-divisors on a quasi projective variety over a field. These can be seen as conical functions on a balanced polyhedral space. We show the existence of an intersection pairing for so called nef toroidal b-divisors\, which gives rise to a Monge-Ampére type measure on the polyhedral space. Moreover\, using the theory of Okounkov bodies\, we show that a Hilbert-Samuel type formula holds in this setting. We then show some applications of this theory. First\, we show some Chern-Weil type formulae for singular semi-positive metrics on line bundles. Then\, using the Hilbert-Samuel formula\, we compute asymptotic dimension formulae of spaces of automorphic forms on mixed Shimura varieties.
URL:https://crc326gaus.de/event/tba-30/
LOCATION:Mainz\, Hilbertraum (05-432)
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230203T133000
DTEND;TZID=Europe/Berlin:20230203T150000
DTSTAMP:20260531T230840
CREATED:20221214T130418Z
LAST-MODIFIED:20221214T130418Z
UID:4629-1675431000-1675436400@crc326gaus.de
SUMMARY:Integrality of smoothed p-adic Artin L-functions
DESCRIPTION:Bence Forrás (Universität Duisburg-Essen) \nAbstract: We introduce a smoothed version of the equivariant S-truncated p-adic Artin L-function for one-dimensional admissible p-adic Lie extensions of number fields. Integrality of this smoothed p-adic L-function\, conjectured by Greenberg\, has been verified for pro-p extensions (assuming the Equivariant Iwasawa Main Conjecture) as well as p-abelian extensions (unconditionally). Integrality in the general case is also expected to hold\, and is the subject of ongoing research.
URL:https://crc326gaus.de/event/integrality-of-smoothed-p-adic-artin-l-functions/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230203T140000
DTEND;TZID=Europe/Berlin:20230203T150000
DTSTAMP:20260531T230840
CREATED:20221205T120737Z
LAST-MODIFIED:20230123T134644Z
UID:4484-1675432800-1675436400@crc326gaus.de
SUMMARY:Linear degenerate tropical flag matroids
DESCRIPTION:TGiF-Seminar: Tropical geometry in Frankfurt (Second meeting Winter Semester 2022/23) \nVictoria Schleis (Universität Tübingen) \nAbstract: Grassmannians and flag varieties are important moduli spaces in algebraic geometry. Their linear degenerations arise in representation theory as they describe quiver representations and their irreducible modules. As linear degenerations of flag varieties are difficult to analyze algebraically\, we describe them in a combinatorial setting and further investigate their tropical counterparts. \nIn this talk\, I will introduce matroidal\, polyhedral and tropical analoga and descriptions of linear degenerate flags and their varieties obtained in joint work with Alessio Borzì. To this end\, we introduce and study morphisms of valuated matroids. Using techniques from matroid theory\, polyhedral geometry and linear tropical geometry\, we use the correspondences between the different descriptions to gain insight on the structure of linear degeneration. Further\, we analyze the structure of linear degenerate flag varieties in all three settings\, and provide some cover relations on the poset of degenerations. For small examples\, we relate the observations on cover relations to the flat irreducible locus studied in representation theory.
URL:https://crc326gaus.de/event/tba-32/
LOCATION:Frankfurt\, Robert-Mayer-Str. 10\, Raum 711 groß
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230203T153000
DTEND;TZID=Europe/Berlin:20230203T163000
DTSTAMP:20260531T230840
CREATED:20221205T120951Z
LAST-MODIFIED:20230125T132340Z
UID:4496-1675438200-1675441800@crc326gaus.de
SUMMARY:Polyhedral models for K-theory
DESCRIPTION:TGiF-Seminar: Tropical geometry in Frankfurt (Second meeting Winter Semester 2022/23) \nLeonid Monin (Universität Leipzig) \nAbstract: One can associate a commutative\, graded algebra which satisfies Poincare duality to a homogeneous polynomial f on a vector space V. One particularly interesting example of this construction is when f is the volume polynomial on a suitable space of (virtual) polytopes. In this case the algebra A_f recovers cohomology rings of toric or flag varieties. \nIn my talk I will explain these results and present their recent generalizations. In particular\, I will explain how to associate an algebra with Gorenstein duality to any function g on a lattice L. In the case when g is the Ehrhart function on a lattice of integer (virtual) polytopes\, this construction recovers K-theory of toric and full flag varieties.
URL:https://crc326gaus.de/event/tba-33/
LOCATION:Frankfurt\, Robert-Mayer-Str. 10\, Raum 711 groß
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230203T164500
DTEND;TZID=Europe/Berlin:20230203T174500
DTSTAMP:20260531T230840
CREATED:20221205T121408Z
LAST-MODIFIED:20230124T140817Z
UID:4503-1675442700-1675446300@crc326gaus.de
SUMMARY:Universality for tropical maps
DESCRIPTION:TGiF-Seminar: Tropical geometry in Frankfurt (Second meeting Winter Semester 2022/23) \nNavid Nabijou (University of Cambridge) \nAbstract: I will discuss recent work concerning maps from tropical curves to orthants. A “combinatorial type” of such map is the data of an abstract graph together with slope vectors along the edges. To each such combinatorial type there is an associated moduli space\, which parametrises metric enhancements of the graph compatible with the given slopes. This moduli space is a rational polyhedral cone\, giving rise to an affine toric variety.\nOur main result shows that every rational polyhedral cone appears as the moduli space associated to some combinatorial type of tropical map. This establishes universality (also known as Murphy’s law) for tropical maps. The proof is constructive and extremely concrete\, as I will demonstrate. Combined with insights from logarithmic geometry\, our result implies that every toric singularity appears as a virtual singularity on a moduli space of stable logarithmic maps. \n\n\nThis is joint work with Gabriel Corrigan and Dan Simms.
URL:https://crc326gaus.de/event/tba-34/
LOCATION:Frankfurt\, Robert-Mayer-Str. 10\, Raum 711 groß
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230206T150000
DTEND;TZID=Europe/Berlin:20230206T173000
DTSTAMP:20260531T230840
CREATED:20230131T145759Z
LAST-MODIFIED:20230201T124708Z
UID:4821-1675695600-1675704600@crc326gaus.de
SUMMARY:The geometry of coherent sheaves: From derived categories to Higgs bundles
DESCRIPTION:GAUS-Workshop: “Invariants and curve counting” \n15:00-16:00: Luca Battistella (Frankfurt):\nLogarithmic and orbifold Gromov-Witten invariants\nAbstract: Logarithmic Gromov-Witten theory can be thought of as the study of curves in open manifolds\, or\, in other words\, curves with tangency conditions to a boundary divisor. When the divisor is smooth\, several techniques have been developed to compute the invariants\, most notably orbifold stable maps. When the divisor is normal crossings\, on the other hand\, the logarithmic theory remains hardly accessible. The strategy of rank reduction\, i.e. looking at the components of the boundary one at a time\, is more directly applicable to other theories than the logarithmic one (as shown in Nabijou-Ranganathan and B.-Nabijou-Tseng-You) due to tropical obstructions. Inspired by one of the distinguishing features of the logarithmic theory – namely\, birational invariance [Abramovich-Wise] – in joint work with Nabijou and Ranganathan we show that\, when the genus is zero\, tropical obstructions can be disposed of by blowing up the target sufficiently. The slogan is that the logarithmic theory is the limit orbifold theory under birational modifications along the boundary divisor. If time permits I will discuss work in progress towards understanding negative contact. \n16:20-17:20: Georg Oberdieck (Stockholm):\nPandharipande-Thomas theory of elliptic threefolds and Jacobi forms\nAbstract: Pandharipande-Thomas theory is the study of the intersection theory of the moduli space of stable pairs of a threefold. The intersection numbers\, called Pandharipande-Thomas invariants\, may be viewed as counting curves on the threefold subject to given incidence conditions. In this talk we explore the properties of the generating series of Pandharipande-Thomas invariants of elliptically fibered threefolds. There will be two main conjectures: Quasi-Jacobi Property and Holomorphic Anomaly Equations. Together these essentially determine the modular properties of the generating series. The conjectures are motivated by the case of Calabi-Yau threefolds where by mirror symmetry computations Huang-Katz-Klemm conjectured that the series of PT invariants are Jacobi forms. I discuss several examples\, in particular the equivariant geometry of K3xA^1. Here the conjectures lead to explicit new formulas for the invariants. Based on joint work with Maximilian Schimpf.
URL:https://crc326gaus.de/event/invariants-and-curve-counting/
LOCATION:Frankfurt\, Hilbertraum\, Rober-Mayer-Str. 6-8\, Raum 302
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230207T160000
DTEND;TZID=Europe/Berlin:20230207T170000
DTSTAMP:20260531T230840
CREATED:20221108T132317Z
LAST-MODIFIED:20230130T121438Z
UID:4216-1675785600-1675789200@crc326gaus.de
SUMMARY:Asymptotic equidistribution for partition statistics and topological invariants
DESCRIPTION:International Seminar on Automorphic Forms \nThroughout mathematics\, the equidistribution properties of certain objects are a central  theme studied by many authors. In my talk I am going to speak about a joint project with William Craig and Joshua Males\, where we provide a general framework for proving asymptotic equidistribution\, convexity\, and log-concavity of coefficients of generating functions on arithmetic progressions. \nGiulia Cesana (University of Cologne) \nYou can join the Zoom meeting at https://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/international-seminar-on-automorphic-forms-tba-11/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Claire Burrin":MAILTO:claire.burrin@math.uzh.ch
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230210T153000
DTEND;TZID=Europe/Berlin:20230210T170000
DTSTAMP:20260531T230840
CREATED:20230130T121955Z
LAST-MODIFIED:20230130T121955Z
UID:4814-1676043000-1676048400@crc326gaus.de
SUMMARY:Revisiting derived crystalline cohomology
DESCRIPTION:Seminar Arithmetic Geometry \nZhouhang Mao (Paris) \nProjectively generated ∞-categories and left derived functors turn out to be important in derived geometry. In this talk\, we will present the result of the ∞-category of surjections  of animated rings being projectively generated\, the notion of animated PD-pairs —  surjections of animated rings with a “derived” PD-structure\, and how to use these tools to study the crystalline and prismatic cohomology. In particular\, we will deduce various comparison theorems without finiteness conditions. \nZoom (Meeting-ID: 635 7328 0984\, Password: smallest six digit prime)
URL:https://crc326gaus.de/event/revisiting-derived-crystalline-cohomology/
LOCATION:Darmstadt\, Room 401 and Zoom\, Schlossgartenstraße 7\, Darmstadt\, 64289\, Germany
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230414T080000
DTEND;TZID=Europe/Berlin:20230414T170000
DTSTAMP:20260531T230840
CREATED:20230414T122725Z
LAST-MODIFIED:20230414T122725Z
UID:5391-1681459200-1681491600@crc326gaus.de
SUMMARY:tba
DESCRIPTION:International Seminar on Automorphic Forms \nSachi Hashimoto (MPI Leipzig) \nYou can join the Zoom meeting at https://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-39/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Claire Burrin":MAILTO:claire.burrin@math.uzh.ch
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230418T140000
DTEND;TZID=Europe/Berlin:20230418T160000
DTSTAMP:20260531T230840
CREATED:20230419T123404Z
LAST-MODIFIED:20230427T143237Z
UID:5568-1681826400-1681833600@crc326gaus.de
SUMMARY:Arithmetic theta series from CM cycles
DESCRIPTION:Seminar: Non-archimedean geometry \nLucas Gerth (Universität Frankfurt) \nAbstract: We study arithmetic analogues of theta series. Given a simplectic vector space V and a Schwartz function f on V\, there is a collection of cycles Z(n\,f)\, consisting of CM points\, on the Siegel modular variety. Assuming that f satisfies a strong regular semisimple condition at some prime p\, we show that the generating series of the degrees of the cycles Z(n\,f) is a modular form\, We identify it explicitly with a classical theta series for a quaternion unitary similitude group. The proof relies on the p-adic uniformization of the supersingular locus on the Siegel modular variety.
URL:https://crc326gaus.de/event/arithmetic-theta-series-from-cm-cycles/
LOCATION:Frankfurt\, Robert-Mayer-Str. 6-8\, Raum 308
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Annette Werner":MAILTO:werner[at]math.uni-frankfurt.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230418T160000
DTEND;TZID=Europe/Berlin:20230418T170000
DTSTAMP:20260531T230840
CREATED:20230412T102513Z
LAST-MODIFIED:20230412T102513Z
UID:5367-1681833600-1681837200@crc326gaus.de
SUMMARY:On quasimodular forms associated to projective representations of symmetric groups
DESCRIPTION:International Seminar on Automorphic Forms \nWe explain how one can naturally associate a quasimodular form to a representation of a symmetric group. We determine its growth and explain how this construction is applied to several problems in enumerative geometry. Finally\, we discuss the difference between linear and projective representations. This is based on joint work with Adrien Sauvaget. \nJan-Willem van Ittersum (MPIM Bonn) \nYou can join the Zoom meeting at https://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/on-quasimodular-forms-associated-to-projective-representations-of-symmetric-groups/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Claire Burrin":MAILTO:claire.burrin@math.uzh.ch
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230424T150000
DTEND;TZID=Europe/Berlin:20230424T173000
DTSTAMP:20260531T230840
CREATED:20230316T134050Z
LAST-MODIFIED:20230419T063337Z
UID:5090-1682348400-1682357400@crc326gaus.de
SUMMARY:The geometry of coherent sheaves: From derived categories to Higgs bundles
DESCRIPTION:GAUS-Workshop: “Recent developments in GIT” \n14:00-15:00: Victoria Hoskins (Nijmegen\, speaking remotely): An introduction to geometric invariant theory \nAbstract: The aim of this survey talk is to give an introduction to geometric invariant theory in order to prepare the audience for the subsequent talks as requested by the organisers. I will start by explaining how group actions often appear in moduli problems and we will see how constructing algebra-geometric quotients is related to 19th century invariant theory. I will explain why the theory is simplest for non-reductive group actions and\, in this case\, I will explain how Mumford constructs quotients (of certain open ‘semistable’ subsets) using geometric invariant theory\, as well as giving combinatorial and numerical criteria for semistability. If there is time\, I will briefly mention some recent developments to extend GIT to certain non-reductive group actions. \n15:20-16:20: Joshua Jackson (Sheffield): Advances in Non-reductive GIT and applications\n\nAbstract: Following from the previous talk on reductive GIT\, I will survey recent developments in extending this theory to non-reductive groups\, with a particular focus on applications to moduli theory. Time permitting\, I will then indicate how non-reductive GIT can be used in the study of sheaves\, Higgs bundles\, hypersurfaces\, and singular curves. \n16:40-17:40: Dario Weissmann (Essen): A stacky approach to identify the semi-stable locus of vector bundles \nAbstract: I report on recent joint work with Xucheng Zhang focusing on our Theorem A for vector bundles in characteristic 0: The semi-stable locus in the stack of bundles over a smooth projective curve is the maximal open locus admitting a schematic good moduli space. This gives an intrinsic motivation for semi-stability of vector bundles. Historically\, semi-stability appeared in the quest for a moduli space of bundles and the classical construction of this moduli space uses a non-canonical GIT-construction. Theorem A also provides us with natural examples of good moduli spaces which are only algebraic spaces and not schemes. \n 
URL:https://crc326gaus.de/event/the-geometry-of-coherent-sheaves-from-derived-categories-to-higgs-bundles-copy/
LOCATION:Frankfurt\, Robert-Mayer-Str. 10\, Raum 711 groß
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230425T140000
DTEND;TZID=Europe/Berlin:20230425T160000
DTSTAMP:20260531T230840
CREATED:20230419T123802Z
LAST-MODIFIED:20230425T104423Z
UID:5578-1682431200-1682438400@crc326gaus.de
SUMMARY:Comparison of tame and log-étale cohomology
DESCRIPTION:Seminar: Non-archimedean geometry\nCancelled: postponed by one week \nAmine Koubaa (Universität Frankfurt) \nAbstract: tba
URL:https://crc326gaus.de/event/tba-53/
LOCATION:Frankfurt\, Robert-Mayer-Str. 6-8\, Raum 308
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Annette Werner":MAILTO:werner[at]math.uni-frankfurt.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20230425T160000
DTEND;TZID=Europe/Berlin:20230425T170000
DTSTAMP:20260531T230840
CREATED:20230414T122304Z
LAST-MODIFIED:20230418T130900Z
UID:5387-1682438400-1682442000@crc326gaus.de
SUMMARY:Almost holomorphic Drinfeld modular forms
DESCRIPTION:International Seminar on Automorphic Forms \nOguz Gezmis (Heidelberg University) \nIn his series of papers from 1970s\, Shimura analyzed a non-holomorphic operator\, nowadays called the Maass-Shimura operator\, and later extensively studied almost holomorphic modular forms. He also discovered their role on constructing class fields as well as the connection with periods of CM elliptic curves. In this talk\, our first goal is to introduce their positive characteristic counterpart\, almost holomorphic Drinfeld modular forms. We further relate them to Drinfeld quasi-modular forms which leads us to generalize the work of Bosser and Pellarin to a certain extend. Moreover\, we introduce the Maass-Shimura operator $\delta_k$ in our setting for any nonnegative integer k and investigate the relation between the periods of CM Drinfeld modules and the values at CM points of arithmetic Drinfeld modular forms under the image of $\delta_k$. If time permits\, we also reveal how to construct class fields by using such values. This is a joint work with Yen-Tsung Chen. \nYou can join the Zoom meeting at https://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-37/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Claire Burrin":MAILTO:claire.burrin@math.uzh.ch
END:VEVENT
END:VCALENDAR