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X-WR-CALDESC:Events for CRC 326 - GAUS
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260507T153000
DTEND;TZID=Europe/Berlin:20260507T183000
DTSTAMP:20260619T162723
CREATED:20260303T110945Z
LAST-MODIFIED:20260407T072932Z
UID:12755-1778167800-1778178600@crc326gaus.de
SUMMARY:CRC-Colloquium
DESCRIPTION:15:00 Coffee\n15:30 – 16:30 Sabrina Pauli (TU Darmstadt): Tropical and Arithmetic Perspectives\n16:30 Coffee and Cake\n17:00 – 18:00 Jakob Stix (Goethe Universität Frankfurt): The Anabelian Section Conjecture\n18:30 Dinner \n 
URL:https://crc326gaus.de/event/crc-colloquium/
LOCATION:Darmstadt
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260508T133000
DTEND;TZID=Europe/Berlin:20260508T143000
DTSTAMP:20260619T162723
CREATED:20260505T074641Z
LAST-MODIFIED:20260505T074641Z
UID:13344-1778247000-1778250600@crc326gaus.de
SUMMARY:Syntomic descent spectral sequence for arithmetic p-adic varieties
DESCRIPTION:Yicheng Zhou (Paris-Saclay) \nFor a “large” class of rigid-analytic varieties over a p-adic local field\, we explain how to construct a natural syntomic descent spectral sequence compatible with the Hochschild-Serre spectral sequence. As a consequence\, for proper rigid-analytic varieties\, the étale regulators maps on suitable K-theoretic groups factor through their syntomic counterparts\, for suitably defined syntomic Chern class maps.
URL:https://crc326gaus.de/event/syntomic-descent-spectral-sequence-for-arithmetic-p-adic-varieties/
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:20260512T123000
DTEND;TZID=Europe/Berlin:20260512T133000
DTSTAMP:20260619T162723
CREATED:20260529T091040Z
LAST-MODIFIED:20260529T091239Z
UID:13457-1778589000-1778592600@crc326gaus.de
SUMMARY:AGTZ-Kolloquium
DESCRIPTION:Carl Mautner (University of California\, Riverside\, USA) \nHilbert schemes\, perverse sheaves and a new Schur algebra \nThe Schur algebra is a finite-dimensional algebra that connects the representation theory of the symmetric and general linear groups. In joint work with Tom Braden\, we give an algebraic description of the category of perverse sheaves with coefficients in a field of characteristic p on S^n(C^2)\, the n-fold symmetric product of the plane\, in terms of a new\, enhanced version of the Schur algebra. This work is motivated by a geometric description of the standard Schur algebra and the theory of symplectic duality.
URL:https://crc326gaus.de/event/agtz-kolloquium-2/
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:20260518T160000
DTEND;TZID=Europe/Berlin:20260518T180000
DTSTAMP:20260619T162723
CREATED:20260413T115012Z
LAST-MODIFIED:20260427T082319Z
UID:13049-1779120000-1779127200@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 309
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260521T141500
DTEND;TZID=Europe/Berlin:20260521T151500
DTSTAMP:20260619T162723
CREATED:20260529T091515Z
LAST-MODIFIED:20260529T091515Z
UID:13461-1779372900-1779376500@crc326gaus.de
SUMMARY:AGTZ Kolloquium
DESCRIPTION:Marc Hoyois (Uni Regensburg) \nPoincaré localizing invariants of schemes \nIn joint work with Markus Land\, we investigate motivic properties of Poincaré localizing invariants of schemes\, like Grothendieck-Witt theory\, and we establish that they satisfy a projective bundle formula and descent for the Nisnevich topology. This implies that the motivic sphere spectrum over (almost) any local ring R admits a faithful action of the Grothendieck-Witt group of nondegenerate symmetric bilinear forms over R.
URL:https://crc326gaus.de/event/agtz-kolloquium-3/
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:20260522T133000
DTEND;TZID=Europe/Berlin:20260522T143000
DTSTAMP:20260619T162723
CREATED:20260505T075121Z
LAST-MODIFIED:20260505T075121Z
UID:13346-1779456600-1779460200@crc326gaus.de
SUMMARY:Construction of logarithmic cohomology theories
DESCRIPTION:Doosung Park (Wuppertal) \nIn this talk\, I will explain a functor extending cohomology theories from schemes to log schemes. Using this functor\, we can obtain the log cyclotomic trace\, and we can represent K-theory in the logarithmic motivic homotopy category. I will also explain an application to the p-adic deformation problem for the K-theory of semistable schemes.
URL:https://crc326gaus.de/event/construction-of-logarithmic-cohomology-theories/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260522T140000
DTEND;TZID=Europe/Berlin:20260522T160000
DTSTAMP:20260619T162723
CREATED:20260511T122419Z
LAST-MODIFIED:20260511T122419Z
UID:13378-1779458400-1779465600@crc326gaus.de
SUMMARY:Toward the noncommutative minimal model program
DESCRIPTION:The aim of the talk is to introduce the noncommutative minimal model program (ncMMP) proposed by Halpern-Leistner and inspired by some works of Dubrovin and Kontsevich. For a given projective variety X\, the classical minimal model program asks if there is a variety Y that is birational to X but has simpler geometry\, such Y is called a minimal model of X. In the noncommutative context\, we consider the derived category D(X) of coherent sheaves on X\, and we ask if we can decompose it canonically. The biggest factor of the decomposition is then a minimal model for D(X). In order to find such a decomposition Halpern-Leistner proposes to use the quantum cohomology of X.\nWe will discuss some examples where Halpern-Leistner’s proposal is satisfied: Grassmannians\, quadrics\, and cubics in dimensions 3 and 4.
URL:https://crc326gaus.de/event/toward-the-noncommutative-minimal-model-program/
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:20260522T153000
DTEND;TZID=Europe/Berlin:20260522T170000
DTSTAMP:20260619T162723
CREATED:20260319T100054Z
LAST-MODIFIED:20260518T072739Z
UID:12873-1779463800-1779469200@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Lucien Hennecart (CNRS): The BPS sheaf for preprojective algebras and moduli of Higgs bundles \nIn the first part of the talk\, I will introduce the BPS sheaf associated with the preprojective algebra of a quiver. This is a perverse sheaf on the moduli space of representations\, endowed with a Lie algebra structure\, which encodes the Kac polynomials of the quiver. Its structure is described in terms of generators and relations in joint work with Davison and Schlegel Mejia. This description is formulated in terms of a generalized Kac–Moody algebra. \nIn the second part\, I will explain how this description makes it possible to determine the supports and local systems of the direct summands of the BPS sheaf. This description involves the geometry of hypertoric varieties in general\, and can in certain cases be simplified. Applying these results to the Hitchin fibration\, one recovers results due to de Cataldo\, Heinloth\, Migliorini\, and also Mauri\, concerning the effective decomposition theorem for the Hitchin morphism involving Ngo strings. This is all based on various discussions with Ben Davison. \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl)
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-32/
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:20260527T160000
DTEND;TZID=Europe/Berlin:20260527T180000
DTSTAMP:20260619T162723
CREATED:20260512T073341Z
LAST-MODIFIED:20260513T120213Z
UID:13387-1779897600-1779904800@crc326gaus.de
SUMMARY:Oberseminar Algebra und Geometrie
DESCRIPTION:Konstantinos Kartas (Universität Münster): Taming perfectoid algebras \nAbstract: The almost purity theorem is a foundational result in perfectoid geometry which\, as the name suggests\, holds only in an “almost” sense. We aim to identify a class of rings for which the theorem holds in a genuine (non-almost) form. Joint work in progress with Franziska Jahnke. \n  \n 
URL:https://crc326gaus.de/event/oberseminar-algebra-und-geometrie-8/
LOCATION:Frankfurt\, Robert-Mayer-Str. 6-8\, Raum 309
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260528T141500
DTEND;TZID=Europe/Berlin:20260528T151500
DTSTAMP:20260619T162723
CREATED:20260525T204255Z
LAST-MODIFIED:20260525T204255Z
UID:13441-1779977700-1779981300@crc326gaus.de
SUMMARY:Kolloquium Geometrie und Arithmetik
DESCRIPTION:Niklas Kipp (Paris-Saclay): A solid Syntomification \nAbstract: We will learn a strategy to obtain a well behaved six-functor formalism for Syntomic cohomology of p-adic formal schemes as defined by Bhatt-Morrow-Scholze. Here well behaved mainly refers to this six-functor formalism generalising Poincaré duality (which was proven by Longke Tang in the smooth and proper case) to smooth morphisms using a version of compactly supported syntomic cohomology. Concretely\, we will recall some aspects of the stacky approach to Prismatic/Syntomic cohomology (following Bhatt-Lurie and Drinfeld) as well as some aspects of the theory of (Solid) analytic stacks (following Clausen-Scholze). \n  \n 
URL:https://crc326gaus.de/event/kolloquium-geometrie-und-arithmetik/
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:20260528T141500
DTEND;TZID=Europe/Berlin:20260528T151500
DTSTAMP:20260619T162723
CREATED:20260529T091856Z
LAST-MODIFIED:20260529T091856Z
UID:13464-1779977700-1779981300@crc326gaus.de
SUMMARY:AGTZ Kolloquium
DESCRIPTION:Niklas Kipp (Paris-Sanclay) \nA solid Syntomification \nWe will learn a strategy to obtain a well behaved six-functor formalism for Syntomic cohomology of p-adic formal schemes as defined by Bhatt-Morrow-Scholze. Here well behaved mainly refers to this six-functor formalism generalising Poincaré duality (which was proven by Longke Tang in the smooth and proper case) to smooth morphisms using a version of compactly supported syntomic cohomology. Concretely\, we will recall some aspects of the stacky approach to Prismatic/Syntomic cohomology (following Bhatt-Lurie and Drinfeld) as well as some aspects of the theory of (Solid) analytic stacks (following Clausen-Scholze).
URL:https://crc326gaus.de/event/agtz-kolloquium-4/
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:20260529T140000
DTEND;TZID=Europe/Berlin:20260529T160000
DTSTAMP:20260619T162723
CREATED:20260518T070612Z
LAST-MODIFIED:20260518T070612Z
UID:13421-1780063200-1780070400@crc326gaus.de
SUMMARY:Membranes and Maps
DESCRIPTION:In joint work with A. Brini\, it was conjectured that equivariant Gromov–Witten invariants of Calabi–Yau fivefolds are governed by so-called membrane indices. When the fivefold is a product of a Calabi–Yau threefold and the affine plane\, the latter invariants agree with\, or refine\, Gopakumar–Vafa invariants. I will present evidence for the conjecture. Moreover\, I will explain how the numerical correspondence informs us about a possible modular interpretation of M2-branes since ultimately their moduli space should give rise to membrane indices. Building on ideas of Nekrasov and Okounkov\, I will propose a geometric interpretation of M2-branes in some concrete situations. I will then translate this proposal into formulas for Hodge integrals\, which can be verified in certain limits. This is based on work in progress with A. Giacchetto and R. Pandharipande.
URL:https://crc326gaus.de/event/membranes-and-maps/
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:20260529T153000
DTEND;TZID=Europe/Berlin:20260529T170000
DTSTAMP:20260619T162723
CREATED:20260319T100223Z
LAST-MODIFIED:20260422T125411Z
UID:12875-1780068600-1780074000@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Manuel Hoff (Bielefeld): Sheared displays and p-divisible groups \nAbstract: Let p be a prime and let R be a p-nilpotent ring. The theory of displays\, as developed by Zink and Lau\, gives an equivalence between infinitesimal p-divisible groups and V-nilpotent displays over R. The aim of the talk is to explain that general p-divisible groups are equivalent to sheared displays\, the analogue of displays where the ring of Witt vectors is replaced by its sheared version. This is joint work with Eike Lau. \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl)
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-33/
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
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