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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241108T153000
DTEND;TZID=Europe/Berlin:20241108T170000
DTSTAMP:20260425T024558
CREATED:20240909T081457Z
LAST-MODIFIED:20241021T103300Z
UID:9174-1731079800-1731085200@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Siyan Daniel Li-Huerta (MPIM Bonn): Close fields and the local Langlands correspondence \nThere is a heuristic that\, as ramification goes to infinity\, p-adic fields tend to function fields. For Galois representations\, this was made precise by Deligne\, and for representations of p-adic groups\, a similar result was shown by Kazhdan and Ganapathy. We present a proof that this is compatible with Fargues–Scholze’s local Langlands correspondence. The proof relies on carrying out Fargues–Scholze’s construction over the one-point compactification of the natural numbers. \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-12/
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:20241112T160000
DTEND;TZID=Europe/Berlin:20241112T170000
DTSTAMP:20260425T024558
CREATED:20241016T114448Z
LAST-MODIFIED:20241105T091814Z
UID:9381-1731427200-1731430800@crc326gaus.de
SUMMARY:On an extension of the Rohrlich-Jensen formula
DESCRIPTION:International Seminar on Automorphic Forms \nLeila Smajlovic (University of Sarajevo): On an extension of the Rohrlich-Jensen formula \nWe revisit the Rohrlich-Jensen formula and prove that\, in the case of any Fuchsian group of the first kind with one cusp it can be viewed as a regularized inner product of special values of two Poincaré series\, one of which is the Niebur-Poincaré series and the other is the resolvent kernel of the Laplacian. The regularized inner product can be seen as a type of Maass-Selberg relation. In this form\, we develop a Rohrlich-Jensen formula associated to any Fuchsian group Γ of the first kind with one cusp by employing a type of Kronecker limit formula associated to the resolvent kernel. We present two examples of our main result: First\, when Γ is the full modular group; and second when Γ is an Atkin-Lehner group Γ0(N)+. This work is joint with James Cogdell and Jay Jorgenson. \nhttps://tu-darmstadt.zoom.us/j/68048280736 \nThe password is the first Fourier coefficient of the modular j-function (as digits) \n 
URL:https://crc326gaus.de/event/tba-118/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Claire Burrin":MAILTO:claire.burrin@math.uzh.ch
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241115T111500
DTEND;TZID=Europe/Berlin:20241115T121500
DTSTAMP:20260425T024558
CREATED:20241108T101412Z
LAST-MODIFIED:20241126T101943Z
UID:9752-1731669300-1731672900@crc326gaus.de
SUMMARY:Jacobi forms\, mock modular forms and qMZVs in enumerative geometry
DESCRIPTION:Jan-Willem van Ittersum (Cologne) \nAbstract: There are several instances where Gromov-Witten invariants can be expressed in terms of (quasi)Jacobi forms. In other examples in enumerative geometry\, one also encounters mock modular forms or even q-analogues of multiple zeta values. We explain the origin and properties of these series and provide examples of their occurrences as generating series of geometrical invariants.\n\nhttps://sites.google.com/view/heidelbergag/algebraic-geometry-seminar
URL:https://crc326gaus.de/event/jacobi-forms-mock-modular-forms-and-qmzvs-in-enumerative-geometry/
LOCATION:Heidelberg\, MATHEMATIKON\, SR 11\, INF 205\, Heidelberg\, Germany
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Georg Bernhard Oberdieck":MAILTO:georgo@uni-heidelberg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241115T133000
DTEND;TZID=Europe/Berlin:20241115T150000
DTSTAMP:20260425T024558
CREATED:20241106T133148Z
LAST-MODIFIED:20241126T102031Z
UID:9724-1731677400-1731682800@crc326gaus.de
SUMMARY:Antisymmetry in the theory of rigid meromorphic cocycles
DESCRIPTION:Sören Sprehe (Universität Bielefeld) \nAround six years ago Darmon and Vonk initiated the theory of p-adic singular moduli for real quadratic fields by defining “rigid meromorphic cocycles”. These are elements of the first cohomology group of Ihara’s group SL2(Z[1/p]) with values in the group of rigid meromorphic functions on Drinfeld’s upper half-plane. Using rigid meromorphic cocycles\, Darmon and Vonk assign to each pair of real quadratic irrationalities a p-adic number. The two irrationalities play a vastly different role in the construction of this assignment. However\, it is expected to behave like the difference of two classical singular moduli – in particular\, it should be anti-symmetric in the argument. We will use the recent work of Darmon\, Gehrmann and Lipnowski on rigid meromorphic cocycles for higher dimensional orthogonal groups to give a new\, symmetric construction of this function.
URL:https://crc326gaus.de/event/antisymmetry-in-the-theory-of-rigid-meromorphic-cocycles/
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:20241115T153000
DTEND;TZID=Europe/Berlin:20241115T170000
DTSTAMP:20260425T024558
CREATED:20241016T112344Z
LAST-MODIFIED:20241104T123602Z
UID:9353-1731684600-1731690000@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Ludwig Modin (Leibniz Universität Hannover): Moduli spaces for Theta-strata and non-reductive quotients \nThe U-hat theorem of Bérczi\, Doran\, Hawes and Kirwan gives conditions for when a linear action of a complex graded unipotent group admits a geometric quotient\, it is one of the key results non-reductive geometric invariant theory is built on.\nWe give a stacky re-interpretation of this theorem in terms of Theta-strata\, as introduced by Halpern-Leistner\, of algebraic stacks. As a corollary we generalize the U-hat theorem to not necessarily linear actions of graded unipotent groups over a Noetherian base scheme. \nZoom (635 7328 0984)\, Kenncode: kleinste sechsstellige Primzahl
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-13/
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:20241119T160000
DTEND;TZID=Europe/Berlin:20241119T170000
DTSTAMP:20260425T024558
CREATED:20241016T114537Z
LAST-MODIFIED:20241108T080337Z
UID:9382-1732032000-1732035600@crc326gaus.de
SUMMARY:Cones of Noether-Lefschetz divisors and moduli of hyperkähler manifolds
DESCRIPTION:International Seminar on Automorphic Forms \nLaure Flapan (Michigan State University): Cones of Noether-Lefschetz divisors and moduli of hyperkähler manifolds \nWe describe how to compute cones of Noether-Lefshetz divisors on orthogonal modular varieties with a particular view towards moduli spaces of polarized K3 surfaces and hyperkähler manifolds. We then describe some geometric applications of these cone computations for these moduli spaces. This is joint work with I. Barros\, P. Beri\, and B. Williams. \nhttps://tu-darmstadt.zoom.us/j/68048280736 \nThe password is the first Fourier coefficient of the modular j-function (as digits) \n 
URL:https://crc326gaus.de/event/tba-119/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Claire Burrin":MAILTO:claire.burrin@math.uzh.ch
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241122T103000
DTEND;TZID=Europe/Berlin:20241122T113000
DTSTAMP:20260425T024558
CREATED:20241111T132603Z
LAST-MODIFIED:20241126T102342Z
UID:9817-1732271400-1732275000@crc326gaus.de
SUMMARY:Differential operators on automorphic forms\, special functions\, and arithmetic applications
DESCRIPTION:Tomoyoshi Ibukiyama\, Professor Emeritus Department of Mathematics Graduate School of Science\, Osaka University \nA theory of differential operators on automorphic forms\nwhich preserve automorphy after restrictions of\nthe domains have a long history and turned out\nto include a nice theory of special functions.\nWe will give rough outline on results\nsince 1990 (partly a joint work with D. Zagier) and\nexplain several arithmetic applications.
URL:https://crc326gaus.de/event/differential-operators-on-automorphic-forms-special-functions-and-arithmetic-applications/
LOCATION:Heidelberg\, MATHEMATIKON\, SR 11\, INF 205\, Heidelberg\, Germany
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Georg Bernhard Oberdieck":MAILTO:georgo@uni-heidelberg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241122T133000
DTEND;TZID=Europe/Berlin:20241122T143000
DTSTAMP:20260425T024558
CREATED:20241113T101011Z
LAST-MODIFIED:20241126T102149Z
UID:9829-1732282200-1732285800@crc326gaus.de
SUMMARY:Heights of modular polynomials
DESCRIPTION:Prof. Dr. Florian Breuer (University of Newcastle) \nFor every positive integer $N$\, the modular polynomial $\Phi_N(X\,Y)$ has integer coefficients and vanishes precisely at pairs of $j$-invariants of elliptic curves linked by a cyclic isogeny of order $N$. These polynomials have applications in cryptography and define integral (but singular) models for the modular curves $X_0(N)$. Their coefficients grow rapidly with $N$. In this talk\, I will explain recent joint work with Fabien Pazuki and Desir\’ee Gij\’on G\’omez obtaining explicit upper and lower bounds on the size of these coefficients. Our methods also lead to explicit bounds on the heights of Hecke images. If time allows\, I can also outline analogous results for Drinfeld modular polynomials.
URL:https://crc326gaus.de/event/heights-of-modular-polynomials/
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:20241122T141500
DTEND;TZID=Europe/Berlin:20241122T151500
DTSTAMP:20260425T024558
CREATED:20241115T214100Z
LAST-MODIFIED:20241126T102247Z
UID:9870-1732284900-1732288500@crc326gaus.de
SUMMARY:Tropical refined curve counting and mirror symmetry
DESCRIPTION:Qaasim Shafi (Heidelberg) \nAn old theorem\, due to Mikhalkin\, says that the number of\nrational plane curves of degree d through 3d-1 points is equal to a\ncount of tropical curves (combinatorial objects which are more amenable\nto computations). There are two natural directions for generalising this\nresult: extending to higher genus curves and allowing for more general\nconditions than passing through points. I’ll discuss a generalisation\nwhich does both\, as well as recent work connecting it to mirror symmetry\nfor log Calabi-Yau surfaces. This is joint work with Patrick\nKennedy-Hunt and Ajith Urundolil Kumaran. \nhttps://sites.google.com/view/heidelbergag/algebraic-geometry-seminar
URL:https://crc326gaus.de/event/tropical-refined-curve-counting-and-mirror-symmetry/
LOCATION:Heidelberg
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Georg Bernhard Oberdieck":MAILTO:georgo@uni-heidelberg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241122T153000
DTEND;TZID=Europe/Berlin:20241122T170000
DTSTAMP:20260425T024558
CREATED:20241016T112540Z
LAST-MODIFIED:20241114T073128Z
UID:9355-1732289400-1732294800@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Andrés Jaramillo Puentes (Universität Tübngen): A Wall-Crossing Formula for Motivic Gromov-Witten Invariants \nIn enumerative geometry\, Gromov-Witten invariants play a central role in counting curves on algebraic varieties\, and their variations under different conditions provide a rich framework for understanding moduli spaces. In recent years\, there has been significant progress in developing enriched versions of these invariants within the framework of motivic homotopy theory\, leading to what we now call motivic Gromov-Witten invariants. Motivic invariants encode additional algebraic structure over the Grothendieck-Witt ring of a base field\, allowing for finer distinctions in curve counts\, particularly over fields with nontrivial real structure. \nIn this talk\, we discuss a wall-crossing formula for motivic Gromov-Witten invariants. Specifically\, we explore how variations in point conditions and configurations influence the values of these invariants\, and demonstrate how these changes can be systematically tracked using a motivic analogue of classical wall-crossing phenomena. We will illustrate how this formula provides a mechanism to relate invariants associated with distinct configurations by tracking contributions along certain “walls” in the parameter space\, which play an analogous role to wall-crossing in real enumerative geometry. \nAdditionally\, we will present applications of this formula to specific enumerative problems\, showcasing how the motivic perspective not only recovers known real and complex cases but also opens new pathways for counting problems over arbitrary fields. This development lays the groundwork for future research\, providing a powerful tool to bridge combinatorial and motivic techniques in tropical and algebraic geometry. \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-14/
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:20241126T160000
DTEND;TZID=Europe/Berlin:20241126T170000
DTSTAMP:20260425T024558
CREATED:20241016T114654Z
LAST-MODIFIED:20241120T071853Z
UID:9388-1732636800-1732640400@crc326gaus.de
SUMMARY:Knots\, q-series\, and modular forms
DESCRIPTION:International Seminar on Automorphic Forms \nMatthias Storzer (University College Dublin): Knots\, q-series\, and modular forms \nTo study knots\, we use knot invariants like the colored Jones polynomials (CJP). For alternating knots\, it is known that the CJP converge to a well-defined q-series\, the tail of the CJP. For several but not all knots with up to 10 crossings\, the tail of the CJP can be written as a product of (partial) theta functions and thus has modular properties. In this talk\, we present a general formula for a class of knots.Moreover\, we argue that the tail of the CJP for some knots does not have any modular properties. We also briefly discuss potential topological interpretations of the (non-)modularity.This is joint work with Robert Osburn. \nhttps://tu-darmstadt.zoom.us/j/68048280736 \nThe password is the first Fourier coefficient of the modular j-function (as digits) \n 
URL:https://crc326gaus.de/event/tba-120/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Claire Burrin":MAILTO:claire.burrin@math.uzh.ch
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241127T160000
DTEND;TZID=Europe/Berlin:20241127T170000
DTSTAMP:20260425T024558
CREATED:20241025T145444Z
LAST-MODIFIED:20241025T150057Z
UID:9569-1732723200-1732726800@crc326gaus.de
SUMMARY:Oberseminar Algebra und Geometrie
DESCRIPTION:Jiaming Chen (Universität Frankfurt): Convex Fujita numbers \nAbstract: I will discuss joint work with Alex Küronya\, Yusuf Mustopa\, and Jakob Stix on the effective global generation of adjoint line bundles on smooth projective varieties. To measure effectiveness\, we introduce the concept of the convex Fujita number of a smooth projective variety. I will present several examples and explore its relation to fundamental groups.
URL:https://crc326gaus.de/event/oberseminaralgebrageometrie-convex-fujita-numbers/
LOCATION:Frankfurt\, RM-Str. 6-8\, R. 308
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241128T153000
DTEND;TZID=Europe/Berlin:20241128T183000
DTSTAMP:20260425T024558
CREATED:20240813T094606Z
LAST-MODIFIED:20241016T115553Z
UID:9041-1732807800-1732818600@crc326gaus.de
SUMMARY:CRC-Colloquium
DESCRIPTION:15:20 Coffee (or earlier)\n15:30 – 16:30 Timo Richarz (TU Darmstadt): Reduction of Shimura Varieties\n16:30 Coffee and Cake\n17:15 – 18:15 Jens Eberhardt (Universität Mainz): K-motives and Local Langlands\n18:45 Dinner \nAbstract – Timo Richarz: Reduction of Shimura Varieties\nThe general theory of Shimura varieties\, first developed by Deligne in the 1970s\, extends classical objects such as modular curves\, moduli of polarized abelian varieties and Hilbert-Blumenthal varieties. The varieties play a crucial role in the search for higher reciprocity laws within the Langlands program. The arithmetic properties of Shimura varieties\, in particular their reduction to positive characteristic\, have enabled remarkable advances in arithmetic geometry in recent decades. In this talk\, I will give an overview of recent results concerning the geometry of Shimura varieties in their reduction to positive characteristic. \nAbstract – Jens Eberhardt: K-motives and Local Langlands\nIn this talk\, we construct a geometric realisation of the category of representations of the affine Hecke algebra. For this\, we introduce a formalism of K-theoretic sheaves (called K-motives) on stacks. The affine Hecke algebra arises from the K-theory of the Steinberg stack\, and we explain how to “categorify” this using K-motives. Lastly\, we discuss applications of K-motives to the local geometric Langlands program.
URL:https://crc326gaus.de/event/crc-colloquium-copy01/
LOCATION:Heidelberg\, MATHEMATIKON\, Konferenzraum\, 5. OG\, Campus Im Neuenheimer Feld (INF)\, INF 205\, Heidelberg\, 69120\, Germany
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241129T103000
DTEND;TZID=Europe/Berlin:20241129T113000
DTSTAMP:20260425T024558
CREATED:20241111T143705Z
LAST-MODIFIED:20241122T141045Z
UID:9821-1732876200-1732879800@crc326gaus.de
SUMMARY:Quantum periods\, toric degenerations and intrinsic mirror symmetry
DESCRIPTION:Samuel M Johnston\, Heilbronn Research Fellow at Imperial College London
URL:https://crc326gaus.de/event/tba-126/
LOCATION:Heidelberg\, MATHEMATIKON\, SR 11\, INF 205\, Heidelberg\, Germany
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Georg Bernhard Oberdieck":MAILTO:georgo@uni-heidelberg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241129T133000
DTEND;TZID=Europe/Berlin:20241129T143000
DTSTAMP:20260425T024558
CREATED:20241119T102406Z
LAST-MODIFIED:20241125T105040Z
UID:9903-1732887000-1732890600@crc326gaus.de
SUMMARY:The degree of algebraic cycles on hypersurfaces
DESCRIPTION:Matthias Paulsen (Universität Marburg) \nAbstract: Let X be a very general hypersurface of dimension 3 and degree d at least 6. Griffiths and Harris conjectured in 1985 that the degree of every curve on X is divisible by d. Substantial progress on this conjecture was made by Kollár in 1991 via degeneration arguments. However\, the conjecture of Griffiths and Harris remained open in any degree d. In this talk\, I will explain how to prove this conjecture (and its higher-dimensional analogues) for infinitely many degrees d.
URL:https://crc326gaus.de/event/the-degree-of-algebraic-cycles-on-hypersurfaces/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241129T153000
DTEND;TZID=Europe/Berlin:20241129T170000
DTSTAMP:20260425T024558
CREATED:20241016T112643Z
LAST-MODIFIED:20241119T072742Z
UID:9356-1732894200-1732899600@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Felipe Espreafico (IMJ-PRG): Gauss-Main Connection in Disguise: A «quasi-modularity» for Gromov-Witten invariants for the Quintic Threefold \nGromov-Witten invariants and modularity are topics that often come together. In this talk\, we will explore a type of quasi-modularity for the genus zero invariants for the quintic threefold. We start by explaining how classical Eisenstein series are related to periods of the Weistrass family of Elliptic Curves. A similar relation may be observed by looking at periods of the mirror quintic family: that generating functions for the genus zero invariants can be written in terms of solutions to certain differential systems coming from the Gauss-Manin connection that generalize the classical Ramanujan equations that give rise to Eisenstein series. This is part of larger program called Gauss-Manin connection in Disguise\, that can be also applied in other contexts. We finish by briefly discussing other applications and further questions. \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-15/
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:20241203T160000
DTEND;TZID=Europe/Berlin:20241203T170000
DTSTAMP:20260425T024558
CREATED:20241016T114757Z
LAST-MODIFIED:20241127T145427Z
UID:9394-1733241600-1733245200@crc326gaus.de
SUMMARY:Topographs and some infinite series
DESCRIPTION:International Seminar on Automorphic Forms \nCormac O’Sullivan (CUNY)): Topographs and some infinite series\nThe Fibonacci numbers are a familiar recursive sequence. Topographs are a kind of two dimensional version conjured up by J.H. Conway in his study of integral binary quadratic forms. These forms are ax^2 + bxy + cy^2 with integer coefficients\, and have a long history in number theory. We’ll review Conway’s classification of topographs into 4 types and look at some new discoveries. Applications are to new class number formulas and a simplification of a proof of Gauss related to sums of three squares. We’ll also see how several infinite series over all the numbers in a topograph may be evaluated explicitly. This generalizes and extends results of Hurwitz and more recent authors and requires a certain Poincare series.  \nhttps://tu-darmstadt.zoom.us/j/68048280736 \nThe password is the first Fourier coefficient of the modular j-function (as digits) \n 
URL:https://crc326gaus.de/event/tba-121/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Claire Burrin":MAILTO:claire.burrin@math.uzh.ch
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241205T141500
DTEND;TZID=Europe/Berlin:20241205T151500
DTSTAMP:20260425T024558
CREATED:20241002T101031Z
LAST-MODIFIED:20241126T120757Z
UID:9275-1733408100-1733411700@crc326gaus.de
SUMMARY:On the transcendental part of K3 surfaces associated with 3D Fano polytopes
DESCRIPTION:
URL:https://crc326gaus.de/event/tba-113/
LOCATION:Mainz\, Hilbertraum (05-432)
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241206T110000
DTEND;TZID=Europe/Berlin:20241206T120000
DTSTAMP:20260425T024558
CREATED:20241202T083638Z
LAST-MODIFIED:20241202T084811Z
UID:10043-1733482800-1733486400@crc326gaus.de
SUMMARY:Tropical refined curve counting and mirror symmetry
DESCRIPTION:Dr. Qaasim Shafi\, postdoctoral research associate at Heidelberg University
URL:https://crc326gaus.de/event/tropical-refined-curve-counting-and-mirror-symmetry-2/
LOCATION:Heidelberg\, MATHEMATIKON\, SR 10\, INF 205\, Heidelberg\, 69124\, Germany
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Georg Bernhard Oberdieck":MAILTO:georgo@uni-heidelberg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241206T133000
DTEND;TZID=Europe/Berlin:20241206T143000
DTSTAMP:20260425T024558
CREATED:20241113T103034Z
LAST-MODIFIED:20241126T102503Z
UID:9832-1733491800-1733495400@crc326gaus.de
SUMMARY:Chow-Heegner Points and Artin Formalism for triple product p-adic L-functions
DESCRIPTION:Kazim Büyükboduk (University College Dublin) \nI will discuss the factorization of a certain triple product p-adic L-function whose interpolation range is empty. The said factorization reflects the Artin formalism for the underlying family of motives (that decompose as the sum of 2 motives of respective degrees 2 and 6). I will explain how this factorization problem can be recast as the comparison of two families of arithmetic GGP conjectures (and can be proved in some cases using this reduction).
URL:https://crc326gaus.de/event/chow-heegner-points-and-artin-formalism-for-triple-product-p-adic-l-functions/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241206T153000
DTEND;TZID=Europe/Berlin:20241206T170000
DTSTAMP:20260425T024558
CREATED:20241016T112752Z
LAST-MODIFIED:20241118T122001Z
UID:9357-1733499000-1733504400@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Christopher Lang (TU Darmstadt): Ekedahl-Oort Stratification of Deligne-Lusztig Varieties \nWhen developing a stratificaion of Rapoport-Zink spaces\, Vollaard and\nWedhorn constructed a decomposition of a certain Deligne-Lusztig variety\nfor a unitary group using smaller Deligne-Lusztig varieties. We will show\nthat this decomposition can be obtained by pullback of the Ekedahl-Oort\nstratification of G-Zips. With this method one gets an Ekedahl-Oort\nstratification of flag varieties for reductive groups\, which refines the\nusual stratification by Deligne-Lusztig varieties. \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-16/
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:20241212T141500
DTEND;TZID=Europe/Berlin:20241212T151500
DTSTAMP:20260425T024558
CREATED:20241126T121001Z
LAST-MODIFIED:20241204T104303Z
UID:10010-1734012900-1734016500@crc326gaus.de
SUMMARY:The heart fan of an abelian category
DESCRIPTION:David Ploog (Stavanger) \nAbstract: To an abelian category such as coherent sheaves on a projective variety or modules over a finite-dimensional algebra\, I associate a fan of convex cones. This fan reflects homological properties of the category. It contains the g-fan of representation theory and is related to the stability conditions.
URL:https://crc326gaus.de/event/tba-133/
LOCATION:Mainz\, Hilbertraum (05-432)
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241213T110000
DTEND;TZID=Europe/Berlin:20241213T120000
DTSTAMP:20260425T024558
CREATED:20241111T144113Z
LAST-MODIFIED:20241206T101054Z
UID:9824-1734087600-1734091200@crc326gaus.de
SUMMARY:Wall crossing for equivariant CY3 categories
DESCRIPTION:Nikolas Kuhn (University of Oxford) \nThe Joyce-Song wall-crossing formulas for Donaldson-Thomas invariants of Calabi-Yau threefolds have proven to be a crucial and versatile tool. In the presence of a torus action\, there are interesting threefold geometries in which the Calabi-Yau condition only holds up to an equivariant twist – examples include Vafa-Witten invariants\, local curves and surfaces and the threefold vertex. In these cases\, invariants are defined using localization\, and Joyce-Song’s theory doesn’t apply. I will explain how ideas from Joyce’s recent work on wall-crossing in abelian categories can be used to prove wall-crossing in this situation\, and which difficulties arise.  This is joint work with Henry Liu and Felix Thimm.
URL:https://crc326gaus.de/event/tba-127/
LOCATION:Heidelberg\, MATHEMATIKON\, SR10\, INF 205\, Heidelberg\, Germany
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Georg Bernhard Oberdieck":MAILTO:georgo@uni-heidelberg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241213T133000
DTEND;TZID=Europe/Berlin:20241213T143000
DTSTAMP:20260425T024558
CREATED:20241203T120958Z
LAST-MODIFIED:20241203T120958Z
UID:10064-1734096600-1734100200@crc326gaus.de
SUMMARY:Resolution of non-singularities and anabelian applications
DESCRIPTION:Emmanuel Lepage (IMJ Paris) \nAbstract: In various anabelian settings over p-adic fields\, one can reconstruct from the fundamental group of a hyperbolic curve the dual graph of the stable reduction of the curve\, and one can get more anabelian information on the curve by applying it to various finite étale covers. For each such finite étale cover\, this graph defines a retract of the analytic space associated to the curve (in the adic or Berkovich sense)\, and resolution of non-singularities predicts that the Berkovich space is homeomorphic to the inverse limit of all these retracts. This was proven in 2023 by Mochizuki and Tsujimura over finite extensions of Q_p. I will try to give a sketch of their proof and explain how to deduce a characterization of geometric Galois sections.
URL:https://crc326gaus.de/event/resolution-of-non-singularities-and-anabelian-applications/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Tim Holzschuh":MAILTO:tholzschuh@mathi.uni-heidelberg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241213T153000
DTEND;TZID=Europe/Berlin:20241213T170000
DTSTAMP:20260425T024558
CREATED:20241016T112848Z
LAST-MODIFIED:20241206T102319Z
UID:9358-1734103800-1734109200@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Thomas Nikolaus (Universität Münster): (Relative) Prismatic cohomology\, K-Theory and Topology\nWe will explain the theory of relative prismatic cohomology (relative to a delta ring) and how this is an essential tool in computations of prismatic cohomology. If time allows we will exlain how this connects to K-Theory and other Homotopy-theoretically defined invariants (such as TP and TR) and to the relative de Rham Witt complex.  \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-17/
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:20241217T160000
DTEND;TZID=Europe/Berlin:20241217T170000
DTSTAMP:20260425T024558
CREATED:20241206T085241Z
LAST-MODIFIED:20241206T085728Z
UID:10101-1734451200-1734454800@crc326gaus.de
SUMMARY:p-adic higher Green's functions for Stark-Heegner Cycles
DESCRIPTION:International Seminar on Automorphic Forms \nHazem Hassan (McGill) \nHeegner Cycles are higher weight generalizations of Heegner points on Modular curves. As such\, one expects them to capture similar arithmetic and modular properties to Heegner points. The higher dimensional nature of Heegner cycles makes them less amenable to algebro-geometric and deformation theoretic approaches. I will introduce Stark-Heegner Cycles\, which are a conjectural analogue to Heegner Cycles in the theory of Real Multiplication. They are defined through p-adic analytic means. Then\, I will describe a p-adic pairing on these cycles which behaves as a local height pairing. When one of the cycles is principal\, the pairing computationally seems to produce algebraic integers living in class fields of real quadratic fields. \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/p-adic-higher-greens-functions-for-stark-heegner-cycles/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Claire Burrin":MAILTO:claire.burrin@math.uzh.ch
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241220T110000
DTEND;TZID=Europe/Berlin:20241220T120000
DTSTAMP:20260425T024558
CREATED:20241112T144032Z
LAST-MODIFIED:20241202T084543Z
UID:9827-1734692400-1734696000@crc326gaus.de
SUMMARY:Euler characteristics of moduli of twisted sheaves on Enriques surfaces
DESCRIPTION:Weisheng Wang\, Utrecht Geometry Center (Utrecht University)
URL:https://crc326gaus.de/event/tba-128/
LOCATION:Heidelberg\, MATHEMATIKON\, SR10\, INF 205\, Heidelberg\, Germany
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Georg Bernhard Oberdieck":MAILTO:georgo@uni-heidelberg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20241220T133000
DTEND;TZID=Europe/Berlin:20241220T143000
DTSTAMP:20260425T024558
CREATED:20241211T131037Z
LAST-MODIFIED:20241211T131037Z
UID:10163-1734701400-1734705000@crc326gaus.de
SUMMARY:On local Galois deformation rings
DESCRIPTION:Julian Quast (Universität Duisburg-Essen) \nIn joint work with Vytautas Paškūnas\, we show that the universal framed\ndeformation ring of an arbitrary mod p representation of the absolute\nGalois group of a p-adic local field valued in a possibly disconnected\nreductive group G is flat\, local complete intersection and of the\nexpected dimension. In particular\, any such mod p representation has a\nlift to characteristic 0. The work extends results of Böckle\, Iyengar\nand Paškūnas in the case G=GL_n. We give an overview of the proof of\nthis main result.
URL:https://crc326gaus.de/event/on-local-galois-deformation-rings/
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:20241220T153000
DTEND;TZID=Europe/Berlin:20241220T170000
DTSTAMP:20260425T024558
CREATED:20241016T112937Z
LAST-MODIFIED:20241210T101446Z
UID:9359-1734708600-1734714000@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Can Yaylali (TU Darmstadt): A^1-homotopy theory of rigid analytic spaces\nIn this talk\, I will report about work with Christian Dahlhausen (Heidelberg) on A^1-homotopy theory of rigid analytic spaces. The B^1-homotopy category has already been defined and studied by Ayoub and a full six-functor formalism was established by Ayoub-Gallauer-Vezzani. One drawback of the B^1-invariant theory is that analytic K-theory for rigid analytic spaces (as defined and studied by Kerz-Saito-Tamme) is not representable since it is not B^1-invariant. Thus we aim for an A^1-invariant version with coefficients in any presentable category. For the stable theory\, we can prove the existence of a partial six-functor formalism for analytifications of schemes and algebraic morphisms between them by using the results of Ayoub’s thesis. Furthermore\, using coefficients in condensed spectra\, we can represent analytic K-theory as the P^1-ring spectrum Z x BGL. If time permits I will also highlight some of the remaining questions. \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-18/
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:20250109T141500
DTEND;TZID=Europe/Berlin:20250109T151500
DTSTAMP:20260425T024558
CREATED:20241126T121104Z
LAST-MODIFIED:20241126T121104Z
UID:10012-1736432100-1736435700@crc326gaus.de
SUMMARY:A new class of maximal hyperelliptic curves
DESCRIPTION:
URL:https://crc326gaus.de/event/a-new-class-of-maximal-hyperelliptic-curves/
LOCATION:Mainz\, Hilbertraum (05-432)
CATEGORIES:GAUS-Seminar
END:VEVENT
END:VCALENDAR