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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220218T140000
DTEND;TZID=Europe/Berlin:20220218T150000
DTSTAMP:20260601T090205
CREATED:20220210T084302Z
LAST-MODIFIED:20220601T070540Z
UID:2273-1645192800-1645196400@crc326gaus.de
SUMMARY:Patchworks of real algebraic varieties in higher codimension
DESCRIPTION:TGiZ-Seminar: Tropical geometry in Zoom (Second meeting) \nJohannes Rau (Universidad de los Andes) \nAbstract:\nI will present a combinatorial setup\, based on smooth tropical varieties and real phase structures\, which after “unfolding” produces a certain class of PL-manifolds (called patchworks). We have two motivations in mind: Firstly\, in the spirit of Viro’s combinatorial patchwoking for hypersurfaces\, these patchworks can be used to describe the topology of real algebraic varieties close to the tropical limit. Secondly\, even if not “realisable” by real algebraic varieties\, real phase structures provide a geometric framework for combinatorial structures such as oriented matroids. Joint work with Arthur Renaudineau and Kris Shaw.
URL:https://crc326gaus.de/event/tgiz-seminar-tropical-geometry-in-zoom-2/
LOCATION:Frankfurt and Zoom
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220218T151500
DTEND;TZID=Europe/Berlin:20220218T161500
DTSTAMP:20260601T090205
CREATED:20220210T104154Z
LAST-MODIFIED:20220601T070641Z
UID:2275-1645197300-1645200900@crc326gaus.de
SUMMARY:Cut-and-paste invariants of moduli spaces of relative stable maps to P^1
DESCRIPTION:TGiZ-Seminar: Tropical geometry in Zoom (Second meeting) \nSiddarth Kannan (Brown University) \nAbstract:\nI will discuss ongoing work studying moduli spaces of genus zero stable maps to P^1\, with fixed ramification profiles over 0 and infinity. I will describe a chamber decomposition of the space of ramification data such that the Grothendieck class of the moduli space is constant on the chambers. Finally\, for the sequence of ramification data corresponding to maximal ramification over 0 and no ramification over infinity\, I will describe a recursive algorithm to compute the generating function for Euler characteristics of these spaces.
URL:https://crc326gaus.de/event/tgiz-seminar-tropical-geometry-in-zoom-3/
LOCATION:Frankfurt and Zoom
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220218T163000
DTEND;TZID=Europe/Berlin:20220218T173000
DTSTAMP:20260601T090205
CREATED:20220210T105232Z
LAST-MODIFIED:20220601T070739Z
UID:2277-1645201800-1645205400@crc326gaus.de
SUMMARY:The S_n action on the homology groups of M_{0\,n}-bar
DESCRIPTION:TGiZ-Seminar: Tropical geometry in Zoom (Second meeting) \nRohini Ramadas (University of Warwick) \nAbstract:\nThe symmetric group on n letters acts on M_{0\,n}-bar\, and thus on its (co-)homology groups. The induced actions on (co-)homology have been studied by\, eg.\, Getzler\, Bergstrom-Minabe\, Castravet-Tevelev. We ask: does H_{2k}(M_{0\,n}-bar) admit an equivariant basis\, i.e. one that is permuted by S_n? We describe progress towards answering this question. This talk includes joint work with Rob Silversmith.
URL:https://crc326gaus.de/event/tgiz-seminar-tropical-geometry-in-zoom-4/
LOCATION:Frankfurt and Zoom
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220223T160000
DTEND;TZID=Europe/Berlin:20220223T170000
DTSTAMP:20260601T090205
CREATED:20220209T080916Z
LAST-MODIFIED:20220214T103253Z
UID:2269-1645632000-1645635600@crc326gaus.de
SUMMARY:Vertex gluings and Demazure products
DESCRIPTION:Oberseminar Algebra und Geometrie \nNathan Pflueger (Amherst College) \nAbstract:\nFinite graphs and metric graphs provide useful combinatorial analogs of algebraic curves. Since the work of Cools-Draisma-Payne Robeva\, it has been known that chains of loops are particularly useful graphs in this regard. I will describe a new perspective on these chains of loops\, by describing a version of Brill-Noether theory for curves or graphs with two marked points. Divisors on twice-marked graphs are associated with permutations; the extent to which a divisor is special is measured by the inversions of the permutation. This twice-marked Brill-Noether theory is well-suited to inductive arguments; when two twice-marked graphs are glued together\, permutations are combined by an operation called the Demazure product. I will describe how this framework provides a short proof of some of the results of Cools-Draisma-Payne Robeva\, as well as more recent results on tropical Hurwitz-Brill-Noether theory\, and may provide a route to identifying new classes of Brill-Noether-General graphs.
URL:https://crc326gaus.de/event/tba/
LOCATION:Frankfurt and Zoom
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220315T103000
DTEND;TZID=Europe/Berlin:20220315T123000
DTSTAMP:20260601T090205
CREATED:20220222T140009Z
LAST-MODIFIED:20220222T140009Z
UID:2334-1647340200-1647347400@crc326gaus.de
SUMMARY:Cones of special cycles and unfolding of the Kudla-Millson lift
DESCRIPTION:Riccardo Zuffetti (Universität Frankfurt) \nDisputation
URL:https://crc326gaus.de/event/cones-of-special-cycles-and-unfolding-of-the-kudla-millson-lift/
LOCATION:Frankfurt and Zoom
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220422T133000
DTEND;TZID=Europe/Berlin:20220422T150000
DTSTAMP:20260601T090205
CREATED:20220413T090417Z
LAST-MODIFIED:20220413T090417Z
UID:2640-1650634200-1650639600@crc326gaus.de
SUMMARY:Dr. Oliver Bräunling: Hilbert reciprocity using K-theory localization
DESCRIPTION:
URL:https://crc326gaus.de/event/dr-oliver-braunling-hilbert-reciprocity-using-k-theory-localization/
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:20220426T160000
DTEND;TZID=Europe/Berlin:20220426T170000
DTSTAMP:20260601T090205
CREATED:20220426T103732Z
LAST-MODIFIED:20220426T103732Z
UID:2814-1650988800-1650992400@crc326gaus.de
SUMMARY:Growth of Bianchi modular forms
DESCRIPTION:In this talk\, I will establish a sharp bound on the growth of cuspidal Bianchi modular forms. By the Eichler-Shimura isomorphism\, we actually give a sharp bound of the second cohomology of a hyperbolic three manifold (Bianchi manifold) with local system arising from the representation Symk⊗Symk¯ of SL2(C). I will explain how a p-adic algebraic method is used for deriving our result. \nYou can joint the Zoom meeting at https://ethz.zoom.us/j/68930894558 \nThe password is the first Fourier coefficient of the modular j-function (as digits).
URL:https://crc326gaus.de/event/growth-of-bianchi-modular-forms/
LOCATION:Zoom
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220428T140000
DTEND;TZID=Europe/Berlin:20220428T160000
DTSTAMP:20260601T090205
CREATED:20220425T100152Z
LAST-MODIFIED:20220425T100152Z
UID:2795-1651154400-1651161600@crc326gaus.de
SUMMARY:On the motivic cohomology of schemes
DESCRIPTION:
URL:https://crc326gaus.de/event/on-the-motivic-cohomology-of-schemes/
LOCATION:Mainz\, Hilbertraum (05-432) and Zoom
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220429T133000
DTEND;TZID=Europe/Berlin:20220429T150000
DTSTAMP:20260601T090205
CREATED:20220422T095835Z
LAST-MODIFIED:20220422T100011Z
UID:2765-1651239000-1651244400@crc326gaus.de
SUMMARY:Recent investigations of L-invariants of modular forms
DESCRIPTION:Ass. Prof. Dr. John Bergdall (Bryn Mawr College / MPIM Bonn)
URL:https://crc326gaus.de/event/recent-investigations-of-l-invariants-of-modular-forms/
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:20220429T140000
DTEND;TZID=Europe/Berlin:20220429T173000
DTSTAMP:20260601T090205
CREATED:20220411T114452Z
LAST-MODIFIED:20220427T071549Z
UID:2593-1651240800-1651253400@crc326gaus.de
SUMMARY:The geometry of coherent sheaves: From derived categories to Higgs bundles
DESCRIPTION:GAUS-Workshop: “Hodge and Poincaré polynomials of moduli spaces of bundles” \n14:00-15:00: Vicente Muñoz (Málaga)\nE-Polynomials of the SL(2\,C)-character varieties of orientable surfaces\n15:15-16:15: Dimitry Wyss (Lausanne)\nIntersection cohomology from non-archimedean integrals
URL:https://crc326gaus.de/event/the-geometry-of-coherent-sheaves-from-derived-categories-to-higgs-bundles/
LOCATION:Frankfurt and Zoom
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220506T133000
DTEND;TZID=Europe/Berlin:20220506T150000
DTSTAMP:20260601T090205
CREATED:20220429T090455Z
LAST-MODIFIED:20220429T090455Z
UID:2841-1651843800-1651849200@crc326gaus.de
SUMMARY:Moduli spaces in p-adic non-abelian Hodge theory
DESCRIPTION:Dr. Ben Heuer\, Universität Bonn
URL:https://crc326gaus.de/event/moduli-spaces-in-p-adic-non-abelian-hodge-theory/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220511T160000
DTEND;TZID=Europe/Berlin:20220511T170000
DTSTAMP:20260601T090205
CREATED:20220222T095902Z
LAST-MODIFIED:20220509T080030Z
UID:2322-1652284800-1652288400@crc326gaus.de
SUMMARY:The Logarithmic Hilbert Scheme and its Tropicalisation
DESCRIPTION:Oberseminar Algebra und Geometrie \nPatrick Kennedy-Hunt (University of Cambridge) \n\nAbstract: Let X be a scheme equipped with a SNC divisor D. I will sketch the construction of a proper moduli space of subschemes Z in expansions of X such that Z satisfies an appropriate transversality condition to D. The central insight is a tropical understanding for when Z is flat over the Artin fan of X\, and how this behaves in families. I will present the example of the logarithmic linear system\, a toric modification of projective space. The associated fan is closely related to the geometry of tropical curves and secondary polytopes. Joint work with Dhruv Ranganathan.
URL:https://crc326gaus.de/event/tba-2/
LOCATION:Frankfurt\, Robert-Mayer-Str. 10\, Raum 711 groß
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220512T140000
DTEND;TZID=Europe/Berlin:20220512T160000
DTSTAMP:20260601T090205
CREATED:20220504T071357Z
LAST-MODIFIED:20220623T073407Z
UID:2885-1652364000-1652371200@crc326gaus.de
SUMMARY:Derived $F$-zips
DESCRIPTION:
URL:https://crc326gaus.de/event/derived-f-zips/
LOCATION:Mainz\, Hilbertraum (05-432) and Zoom
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220513T140000
DTEND;TZID=Europe/Berlin:20220513T153000
DTSTAMP:20260601T090205
CREATED:20220426T082339Z
LAST-MODIFIED:20220426T082339Z
UID:2812-1652450400-1652455800@crc326gaus.de
SUMMARY:Integral models of local Shimura varieties
DESCRIPTION:Abstract: Let $p$ be a prime number. Let $(G\, b\, \mu)$ be a local Shimura datum and $\CG$ be a quasi-parahoric group scheme for $G$ (these terms will be explained in the talk). Scholze has defined a functor on the category of perfectoid spaces in characteristic $p$ and has conjectured that this functor is representable by a formal scheme. I will explain the proof of this conjecture for classical groups. The conjecture also gives a group-theoretical interpretation of Rapoport-Zink spaces. This is joint work with G. Pappas. \nMeeting-ID: 635 7328 0984\nPassword: Smallest six digit prime number
URL:https://crc326gaus.de/event/integral-models-of-local-shimura-varieties/
LOCATION:Darmstadt and Zoom
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220513T150000
DTEND;TZID=Europe/Berlin:20220513T160000
DTSTAMP:20260601T090205
CREATED:20220502T122135Z
LAST-MODIFIED:20220601T070429Z
UID:2869-1652454000-1652457600@crc326gaus.de
SUMMARY:Toroidal b-divisors and Monge-Ampère measures
DESCRIPTION:TGiZ-Seminar: Tropical geometry in Zoom (First meeting Summer Semester 2022) \nAna María Botero (Regensburg University) \nAbstract:\nA b-divisor on a smooth projective algebraic variety X is an element in the projective limit of divisors\, indexed over all smooth proper modifications of X\, and satisfying some functoriality properties. Amongst all b-divisors\, the so-called “toroidal” ones can be studied using convex-geometrical and tropical techniques. The aim of the talk is to give an overview of the theory. This joint work with Jose Burgos and Martin Sombra.
URL:https://crc326gaus.de/event/patchworks-of-real-algebraic-varieties-in-higher-codimension/
LOCATION:Frankfurt and Zoom
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220513T163000
DTEND;TZID=Europe/Berlin:20220513T173000
DTSTAMP:20260601T090205
CREATED:20220502T122524Z
LAST-MODIFIED:20220601T070348Z
UID:2871-1652459400-1652463000@crc326gaus.de
SUMMARY:Chern-Weil theory and Hilbert-Samuel theorem for semi-positive singular toroidal metrics on line bundles
DESCRIPTION:TGiZ-Seminar: Tropical geometry in Zoom (First meeting Summer Semester 2022) \nJosé Ignacio Burgos Gil (ICMAT\, Madrid) \nAbstract:\nIn this talk I will report on joint work with A. Botero\, D. Holmes and R. de Jong. Using the theory of b-divisors and non-pluripolar products we show that Chen-Weil theory and a Hilbert Samuel theorem can be extended to a wide class of singular semi-positive metrics. We apply the techniques relating semipositive metrics on line bundles to b-divisors to study the line bundle of Siegel-Jacobi forms with the Peterson metric. On the one hand we prove that the ring of Siegel-Jacobi forms of constant positive relative index is never finitely generated\, and we recover a formula of Tai giving the asymptotic growth of the dimension of the spaces of Siegel-Jacobi modular forms.
URL:https://crc326gaus.de/event/chern-weil-theory-and-hilbert-samuel-theorem-for-semi-positive-singular-toroidal-metrics-on-line-bundles/
LOCATION:Frankfurt and Zoom
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220518T160000
DTEND;TZID=Europe/Berlin:20220518T170000
DTSTAMP:20260601T090205
CREATED:20220222T100402Z
LAST-MODIFIED:20220509T080629Z
UID:2324-1652889600-1652893200@crc326gaus.de
SUMMARY:δ-Forms and Intersection Numbers
DESCRIPTION:Oberseminar Algebra und Geometrie \nAndreas Mihatsch (Universität Bonn) \n\nAbstract:\nδ-Forms were invented by Gubler–Künnemann\, they are certain\nhybrid objects on non-archimedean spaces that combine the smooth\ndifferential forms of Chambert-Loir–Ducros with tropical intersection\ntheory. In this talk\, I will first present a purely local definition of\nδ-forms that is based on the combinatorics of skeletons in Berkovich\nspaces. I will then explain an application to intersection numbers on\nintegral models: The lengths of artinian complete intersections on the\nmodel agree with certain integrals of δ-forms in the generic fiber.
URL:https://crc326gaus.de/event/tba-3/
LOCATION:Frankfurt\, Robert-Mayer-Str. 10\, Raum 711 groß
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220520T133000
DTEND;TZID=Europe/Berlin:20220520T150000
DTSTAMP:20260601T090205
CREATED:20220513T155410Z
LAST-MODIFIED:20220513T155410Z
UID:3004-1653053400-1653058800@crc326gaus.de
SUMMARY:Chern-Weil theory and Hilbert-Samuel theorem for toroidal semi-positive singular metrics on line bundles
DESCRIPTION:Dr. Ana María Botero
URL:https://crc326gaus.de/event/chern-weil-theory-and-hilbert-samuel-theorem-for-toroidal-semi-positive-singular-metrics-on-line-bundles/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220520T140000
DTEND;TZID=Europe/Berlin:20220520T173000
DTSTAMP:20260601T090205
CREATED:20220411T114643Z
LAST-MODIFIED:20220629T130129Z
UID:2596-1653055200-1653067800@crc326gaus.de
SUMMARY:The geometry of coherent sheaves: From derived categories to Higgs bundles
DESCRIPTION:GAUS-Workshop: “Branes in Higgs bundle moduli spaces” \n14:00-15:00: Emilio Franco (Madrid)\nBranes in the hyperKähler framework\n15:15-16:15: Ana Peon-Nieto (Birmingham)\nSome branes over the singular locus of the Hitchin base\n16:30-17:30: Sebastian Heller (Hannover)\nBranes through finite group actions
URL:https://crc326gaus.de/event/the-geometry-of-coherent-sheaves-from-derived-categories-to-higgs-bundles-2/
LOCATION:Frankfurt and Zoom
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220601T160000
DTEND;TZID=Europe/Berlin:20220601T170000
DTSTAMP:20260601T090205
CREATED:20220411T073933Z
LAST-MODIFIED:20220530T130617Z
UID:2542-1654099200-1654102800@crc326gaus.de
SUMMARY:Invariant rings of reductive representations and singularities of the Minimal Model Program
DESCRIPTION:Oberseminar Algebra und Geometrie \nDaniel Greb (Univ. Duisburg-Essen) \nAbstract:\nI will discuss my recent work with Braun\, Langlois\, and Moraga showing that invariant rings of finite-dimensional representations of (linearly) reductive groups over an algebraically closed field of characteristic zero have Kawamata log-terminal (klt) singularities. I will spend most of the time on explaining what klt singularities are\, why the klt condition is a very natural and geometric condition\, and why smaller classes of singularities are not sufficient in order to understand arbitrary reductive quotient singularities. Then\, I will discuss some applications of the main result\, e.g. to varieties important in geometric representation theory and to certain moduli spaces. If time permits\, I will discuss some ideas of the proof.
URL:https://crc326gaus.de/event/daniel-greb/
LOCATION:Frankfurt\, Robert-Mayer-Str. 10\, Raum 711 groß
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220603T133000
DTEND;TZID=Europe/Berlin:20220603T150000
DTSTAMP:20260601T090205
CREATED:20220524T131617Z
LAST-MODIFIED:20220524T131617Z
UID:3069-1654263000-1654268400@crc326gaus.de
SUMMARY:On the cohomology of the Drinfeld tower
DESCRIPTION:Dr. Gabriel Dospinescu\, Ecole Normale Supérieure de Lyon
URL:https://crc326gaus.de/event/on-the-cohomology-of-the-drinfeld-tower/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Rustam Steingart":MAILTO:rsteingart@mathi.uni-heidelberg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220609T140000
DTEND;TZID=Europe/Berlin:20220609T160000
DTSTAMP:20260601T090205
CREATED:20220518T112552Z
LAST-MODIFIED:20220620T073936Z
UID:3060-1654783200-1654790400@crc326gaus.de
SUMMARY:The wild ramification locus
DESCRIPTION:
URL:https://crc326gaus.de/event/t-b-a/
LOCATION:Mainz\, Hilbertraum (05-432) and Zoom
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220610T133000
DTEND;TZID=Europe/Berlin:20220610T150000
DTSTAMP:20260601T090205
CREATED:20220603T120910Z
LAST-MODIFIED:20220603T120910Z
UID:3097-1654867800-1654873200@crc326gaus.de
SUMMARY:Main conjectures and p-adic Stark conjectures for Artin motives
DESCRIPTION:Dr. Alexandre Maksoud\, Université du Luxembourg
URL:https://crc326gaus.de/event/main-conjectures-and-p-adic-stark-conjectures-for-artin-motives/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220610T150000
DTEND;TZID=Europe/Berlin:20220610T160000
DTSTAMP:20260601T090205
CREATED:20220530T073537Z
LAST-MODIFIED:20220601T070145Z
UID:3072-1654873200-1654876800@crc326gaus.de
SUMMARY:Brill-Noether Theory over the Hurwitz Space
DESCRIPTION:TGiZ-Seminar: Tropical geometry in Zoom (Second meeting Summer Semester 2022) \nDave Jensen (University of Kentucky) \nAbstract:\nBrill-Noether theory is the study of line bundles on algebraic curves. A series of results in the 80’s describe the varieties parameterizing line bundles with given invariants on a sufficiently general curve. More recently\, several mathematicians have turned their attention to the Brill-Noether theory of general covers — that is\, curves that are general in the Hurwitz space rather than in the moduli space of curves. We will survey these recent results and\, time permitting\, some generalizations.
URL:https://crc326gaus.de/event/brill-noether-theory-over-the-hurwitz-space/
LOCATION:Frankfurt and Zoom
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220610T161500
DTEND;TZID=Europe/Berlin:20220610T171500
DTSTAMP:20260601T090205
CREATED:20220530T073812Z
LAST-MODIFIED:20220601T070242Z
UID:3074-1654877700-1654881300@crc326gaus.de
SUMMARY:The combinatorics of the Brill-Noether Theory of general covers
DESCRIPTION:TGiZ-Seminar: Tropical geometry in Zoom (Second meeting Summer Semester 2022) \nKaelin Cook-Powell (Emory University) \nAbstract:\nThe study of line bundles on algebraic curves has historically had deep connections with combinatorics. For example\, standard young tableaux have been used to study line bundles of sufficiently general curves. Recently a variation of tableaux\, known as k-uniform displacement tableaux\, have been used to study line bundles of general covers — that is curves general in the Hurwitz space. We will discuss how these displacement tableaux relate to line bundles of general covers and examine how they are used to produce new results in Brill-Noether Theory.
URL:https://crc326gaus.de/event/the-combinatorics-of-the-brill-noether-theory-of-general-covers/
LOCATION:Frankfurt and Zoom
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220615T160000
DTEND;TZID=Europe/Berlin:20220615T170000
DTSTAMP:20260601T090205
CREATED:20220414T080523Z
LAST-MODIFIED:20220623T090714Z
UID:2700-1655308800-1655312400@crc326gaus.de
SUMMARY:Gorenstein 3-Fanos von Picardzahl 1 mit einer 2-Torus Wirkung;  Gorenstein Fano 3-folds of Picard number 1 with a 2-torus action
DESCRIPTION:Oberseminar Algebra und Geometrie \nAndreas Bäuerle (Univ. Tübingen) \nAbstract: Wir klassifizieren die dreidimensionalen\, nichttorischen\, Q-faktoriellen\, log terminalen\, Gorenstein Fano Varietäten von Picardzahl eins\, die eine effektive Wirkung eines zweidimensionalen Torus besitzen. \nWe classify the non-toric\, Q-factorial\, log terminal\, Gorenstein Fano threefolds of Picard number one that admit an effective action of a two-dimensional torus. \n  \n  \n  \n  \n 
URL:https://crc326gaus.de/event/tba-4/
LOCATION:Frankfurt\, Robert-Mayer-Str. 10\, Raum 711 groß
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220624T133000
DTEND;TZID=Europe/Berlin:20220624T150000
DTSTAMP:20260601T090205
CREATED:20220617T113551Z
LAST-MODIFIED:20220617T113642Z
UID:3145-1656077400-1656082800@crc326gaus.de
SUMMARY:On geometric linear and quadratic Chabauty
DESCRIPTION:Pim Spelier (Universiteit Leiden)
URL:https://crc326gaus.de/event/on-geometric-linear-and-quadratic-chabauty/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Marius Leonhardt":MAILTO:mleonhardt@mathi.uni-heidelberg.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220629T160000
DTEND;TZID=Europe/Berlin:20220629T170000
DTSTAMP:20260601T090205
CREATED:20220509T111933Z
LAST-MODIFIED:20220613T085145Z
UID:2943-1656518400-1656522000@crc326gaus.de
SUMMARY:What is a building and why should one care?
DESCRIPTION:Oberseminar Algebra und Geometrie \nPetra Schwer (Otto-von-Guericke-Universität Magdeburg) \nAbstract:\nGroups like GL_n\, SL_n or SP_n  play an important role in many areas of mathematics. It has been known for a long time that some of their properties (when studied over the reals or complex numbers) are best understood via the associated symmetric spaces. Jaques Tits later introduced buildings as a tool to study the respective groups over other field and developed\, together with Bruhat\, a theory that also captures reductive groups evaluated over non-archimedian local fields with discrete valuations\, like the p-adic numbers. \nIn this talk I will explain how some of the subgroup structures of such a reductive group over a non-Archimedian local field can be explained via Coxeter combinatorics and the geometry of an (affine) Bruhat-Tits building\, its apartments and retractions. The building for example simultaneously encodes the (affine) flag variety and (affine) Grassmannian associated to the group. But it also permits to explain more complicated structures such as representation theoretic data or other associated varieties in purely combinatorial terms.
URL:https://crc326gaus.de/event/tba-6/
LOCATION:Frankfurt\, Robert-Mayer-Str. 10\, Raum 711 groß
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20220701T133000
DTEND;TZID=Europe/Berlin:20220701T150000
DTSTAMP:20260601T090205
CREATED:20220624T153750Z
LAST-MODIFIED:20220624T153750Z
UID:3206-1656682200-1656687600@crc326gaus.de
SUMMARY:A descent principle for compact support cohomology theories
DESCRIPTION:Josefien Kuijper (Stockholms universitet)
URL:https://crc326gaus.de/event/a-descent-principle-for-compact-support-cohomology-theories/
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:20220701T140000
DTEND;TZID=Europe/Berlin:20220701T153000
DTSTAMP:20260601T090205
CREATED:20220628T081233Z
LAST-MODIFIED:20220628T081233Z
UID:3210-1656684000-1656689400@crc326gaus.de
SUMMARY:Hecke orbits on Shimura varieties of Hodge type
DESCRIPTION:Oort conjectured in 1995 that isogeny classes in the moduli space A_g of principally polarised abelian varieties in characteristic p are Zariski dense in the Newton strata containing them. There is a straightforward generalisation of this conjecture to the special fibres of Shimura varieties of Hodge type\, and in this talk\, I will present a proof of this conjecture.  I will mostly focus on the case of A_g since most of the new ideas can already be explained in this special case. This is joint work with Marco D'Addezio.\nMeeting-ID: 635 7328 0984\nPassword: 100003
URL:https://crc326gaus.de/event/hecke-orbits-on-shimura-varieties-of-hodge-type/
LOCATION:Darmstadt\, Room 401 and Zoom\, Schlossgartenstraße 7\, Darmstadt\, 64289\, Germany
CATEGORIES:GAUS-Seminar
END:VEVENT
END:VCALENDAR