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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260526T160000
DTEND;TZID=Europe/Berlin:20260526T170000
DTSTAMP:20260527T052040
CREATED:20260416T144028Z
LAST-MODIFIED:20260520T110619Z
UID:13100-1779811200-1779814800@crc326gaus.de
SUMMARY:International Seminar on Automorphic Forms
DESCRIPTION:Zheng Liu (UCSB): Yoshida lifts and congruences\nA Yoshida lift is the theta lift of two modular forms to GSp(4). Its congruence with stable forms on GSp(4) can be used to produce a lower bound on the Selmer group of the Rankin-Selberg product of the two modular forms. We study this congruence by using Rallis inner product formula\, Bessel periods and Furusawa’s pullback formula\, together with p-adic interpolation. \nZoom (680 4828 0736\, The password is the first Fourier coefficient of the modular j-function (as digits)).
URL:https://crc326gaus.de/event/international-seminar-on-automorphic-forms-14/
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260527T160000
DTEND;TZID=Europe/Berlin:20260527T180000
DTSTAMP:20260527T052040
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:20260528T090000
DTEND;TZID=Europe/Berlin:20260528T110000
DTSTAMP:20260527T052040
CREATED:20260407T111943Z
LAST-MODIFIED:20260430T074957Z
UID:13006-1779958800-1779966000@crc326gaus.de
SUMMARY:Poincaré-Dualität in Charakteristik p
DESCRIPTION:Vortrag 6: Zykelklassenabbildung – Nicolas Otte
URL:https://crc326gaus.de/event/poincare-dualitat-in-charakteristik-p-6/
LOCATION:Heidelberg\, Mathematikon\, SR 8\, Heidelberg\, Germany
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260528T100000
DTEND;TZID=Europe/Berlin:20260528T123000
DTSTAMP:20260527T052040
CREATED:20260414T090820Z
LAST-MODIFIED:20260421T125616Z
UID:13067-1779962400-1779971400@crc326gaus.de
SUMMARY:WKB Analysis: From Quadratic Differentials to Stokes matrices
DESCRIPTION:10:00 – 11:00 Talk 5: Konstantin Jakob (Goethe Universität): Stokes matrices and Voros periods \n11:30 – 12:30 Talk 6: Tianyi Feng (TU Darmstadt): Gentle introduction to the irregular Riemann-Hilbert correspondence \n  \n 
URL:https://crc326gaus.de/event/wkb-analysis-from-quadratic-differentials-to-stokes-matrices-copy/
LOCATION:Frankfurt\, Robert-Mayer-Str. 6-8\, Raum 309
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260528T111500
DTEND;TZID=Europe/Berlin:20260528T124500
DTSTAMP:20260527T052040
CREATED:20260318T131929Z
LAST-MODIFIED:20260318T132447Z
UID:12864-1779966900-1779972300@crc326gaus.de
SUMMARY:The K-theory of Z/p^n
DESCRIPTION:Talk 6: Prismatic envelopes – Otmar Venjakob (Universität Heidelberg)
URL:https://crc326gaus.de/event/the-k-theory-of-z-pn-6/
LOCATION:Heidelberg\, Mathematikon\, SR 8 and Zoom\, INF 205\, Heidelberg\, Germany
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260528T141500
DTEND;TZID=Europe/Berlin:20260528T151500
DTSTAMP:20260527T052040
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:20260528T160000
DTSTAMP:20260527T052040
CREATED:20260430T083641Z
LAST-MODIFIED:20260430T083641Z
UID:13299-1779977700-1779984000@crc326gaus.de
SUMMARY:Symmetric Power Functoriality
DESCRIPTION:14:15 Talk 5 Deforming (\phi\,\Gamma)-Modules: Benjamin Steklov \n  \n 
URL:https://crc326gaus.de/event/symmetric-power-functoriality-5/
LOCATION:Heidelberg
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260529T140000
DTEND;TZID=Europe/Berlin:20260529T160000
DTSTAMP:20260527T052040
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:20260527T052040
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
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260601
DTEND;VALUE=DATE:20260606
DTSTAMP:20260527T052040
CREATED:20260226T144700Z
LAST-MODIFIED:20260226T144700Z
UID:12743-1780272000-1780703999@crc326gaus.de
SUMMARY:Conference: Vertex algebras\, automorphic forms and combinatorics
DESCRIPTION:For more information see \nhttps://conferences.cirm-math.fr/3656.html
URL:https://crc326gaus.de/event/conference-vertex-algebras-automorphic-forms-and-combinatorics/
LOCATION:Marseille
CATEGORIES:GAUS-Workshop
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260601T101500
DTEND;TZID=Europe/Berlin:20260601T114500
DTSTAMP:20260527T052040
CREATED:20260421T091855Z
LAST-MODIFIED:20260421T091855Z
UID:13153-1780308900-1780314300@crc326gaus.de
SUMMARY:de Rham-Witt complex
DESCRIPTION:Timon Tausendpfund \n§6: Seminormal aspects \nThe de Rham–Witt complex is invariant under semi-normalization (and recovers the semi-normalization of a ring). Cover §§6.1-6.2 and §§6.5-6.6\, with a focus on Proposition 6.2.1\, Corollary 6.5.2\, and Theorem 6.5.3. As time permits\, introduce crystalline cohomology (as the cohomology of the structure sheaf on the crystalline site relative to the divided power ring (Zp\,(p))\, see for example the book by Berthelot or Tag 07GI in the Stacks project) and cover §6.4.
URL:https://crc326gaus.de/event/de-rham-witt-complex-5/
LOCATION:Mainz\, Hilbertraum (05-432)
CATEGORIES:GAUS-AG
ORGANIZER;CN="Tom Bachmann":MAILTO:tom.bachmann@uni-mainz.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260602T160000
DTEND;TZID=Europe/Berlin:20260602T170000
DTSTAMP:20260527T052040
CREATED:20260416T144116Z
LAST-MODIFIED:20260421T110931Z
UID:13099-1780416000-1780419600@crc326gaus.de
SUMMARY:International Seminar on Automorphic Forms
DESCRIPTION:tba\nChris Lutsko (University of Houston) \nZoom (680 4828 0736\, The password is the first Fourier coefficient of the modular j-function (as digits)).
URL:https://crc326gaus.de/event/international-seminar-on-automorphic-forms-15/
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260603T140000
DTEND;TZID=Europe/Berlin:20260603T170000
DTSTAMP:20260527T052040
CREATED:20260423T081650Z
LAST-MODIFIED:20260504T133400Z
UID:13218-1780495200-1780506000@crc326gaus.de
SUMMARY:Specialization of iterated Galois groups
DESCRIPTION:14:00 – 15:15 Talk 3: Ruth Wild (Goethe Universität Frankfurt): Extension of the base field – part I \n15:45 – 17:00 Talk 4: Magnus Carlson (Goethe Universität Frankfurt): Extension of the base field – part II \n  \n 
URL:https://crc326gaus.de/event/specialization-of-iterated-galois-groups-copy/
LOCATION:Frankfurt\, Robert-Mayer-Str. 6-8\, Raum 308
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260608T101500
DTEND;TZID=Europe/Berlin:20260608T114500
DTSTAMP:20260527T052040
CREATED:20260421T092119Z
LAST-MODIFIED:20260421T092140Z
UID:13155-1780913700-1780919100@crc326gaus.de
SUMMARY:de Rham-Witt Complex
DESCRIPTION:Anton Engelmann \nDerived considerations \nThe Nygaard filtration and foundations for the last four talks. Define filtered derived categories (Construction 8.4.1) and the Beilinson t-structure (Remark 8.4.8). Use Proposition 8.4.10 as a definition for the functor Lηp\, and give a more explicit description relating it to the functor ηp of §2.1. Discuss Proposition 7.2.4\, Theorem 7.4.7 and Corollary 7.4.8. Finally\, define the Nygaard filtration as in Proposition 8.4.11. As time permits\, come back to some descriptions and properties in §8.1 and §8.2.
URL:https://crc326gaus.de/event/de-rham-witt-complex-6/
LOCATION:Mainz\, Hilbertraum (05-432)
CATEGORIES:GAUS-AG
ORGANIZER;CN="Tom Bachmann":MAILTO:tom.bachmann@uni-mainz.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260609T160000
DTEND;TZID=Europe/Berlin:20260609T170000
DTSTAMP:20260527T052040
CREATED:20260416T144210Z
LAST-MODIFIED:20260421T110720Z
UID:13098-1781020800-1781024400@crc326gaus.de
SUMMARY:International Seminar on Automorphic Forms
DESCRIPTION:tba\nHassan Saad (LSU) \nZoom (680 4828 0736\, The password is the first Fourier coefficient of the modular j-function (as digits)).
URL:https://crc326gaus.de/event/international-seminar-on-automorphic-forms-16/
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260610T140000
DTEND;TZID=Europe/Berlin:20260610T170000
DTSTAMP:20260527T052040
CREATED:20260423T082052Z
LAST-MODIFIED:20260504T133600Z
UID:13222-1781100000-1781110800@crc326gaus.de
SUMMARY:Specialization of iterated Galois groups
DESCRIPTION:14:00 – 15:15 Talk 5: Leonie Nienhaus (Goethe Universität Frankfurt): Proof of theorems 1.2 and 1.3 \n15:45 – 17:00 Talk 6: Benjamin Steklov (Goethe Universität Frankfurt): Proof of theorem 1.4 \n  \n 
URL:https://crc326gaus.de/event/specialization-of-iterated-galois-groups-2/
LOCATION:Frankfurt\, Robert-Mayer-Str. 6-8\, Raum 308
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260611T090000
DTEND;TZID=Europe/Berlin:20260611T110000
DTSTAMP:20260527T052040
CREATED:20260407T112038Z
LAST-MODIFIED:20260428T102053Z
UID:13008-1781168400-1781175600@crc326gaus.de
SUMMARY:Poincaré-Dualität in Charakteristik p
DESCRIPTION:Vortrag 7: Dimension der Kohomologiegruppen – Alexander Schmidt
URL:https://crc326gaus.de/event/poincare-dualitat-in-charakteristik-p-7/
LOCATION:Heidelberg\, Mathematikon\, SR 8\, Heidelberg\, Germany
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260611T100000
DTEND;TZID=Europe/Berlin:20260611T123000
DTSTAMP:20260527T052040
CREATED:20260414T091033Z
LAST-MODIFIED:20260421T125806Z
UID:13070-1781172000-1781181000@crc326gaus.de
SUMMARY:WKB Analysis: From Quadratic Differentials to Stokes matrices
DESCRIPTION:10:00 – 11:00 Talk 7: Paul Siemon (TU Darmstadt): SL(n\, C)-Opers \n11:30 – 12:30 Talk 8: Johannes Horn (Goethe Universität): SL(n\, C)-spectral networks and WKB analysis for opers \n  \n 
URL:https://crc326gaus.de/event/wkb-analysis-from-quadratic-differentials-to-stokes-matrices-3/
LOCATION:Frankfurt\, Robert-Mayer-Str. 6-8\, Raum 309
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260611T111500
DTEND;TZID=Europe/Berlin:20260611T124500
DTSTAMP:20260527T052040
CREATED:20260318T132125Z
LAST-MODIFIED:20260324T100239Z
UID:12866-1781176500-1781181900@crc326gaus.de
SUMMARY:The K-theory of Z/p^n
DESCRIPTION:Talk 7: Generators and relations descriptions for the Nygaard filtration –\nOtmar Venjakob (Universität Heidelberg)
URL:https://crc326gaus.de/event/the-k-theory-of-z-pn-7/
LOCATION:Heidelberg\, Mathematikon\, SR 8 and Zoom\, INF 205\, Heidelberg\, Germany
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260611T141500
DTEND;TZID=Europe/Berlin:20260611T160000
DTSTAMP:20260527T052040
CREATED:20260430T083859Z
LAST-MODIFIED:20260430T083859Z
UID:13301-1781187300-1781193600@crc326gaus.de
SUMMARY:Symmetric Power Functoriality
DESCRIPTION:14:15 Talk 6 Deforming Global Galois Representations: Nils Tietke \n  \n 
URL:https://crc326gaus.de/event/symmetric-power-functoriality-6/
LOCATION:Heidelberg
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260612T133000
DTEND;TZID=Europe/Berlin:20260612T143000
DTSTAMP:20260527T052040
CREATED:20260507T081050Z
LAST-MODIFIED:20260507T081050Z
UID:13363-1781271000-1781274600@crc326gaus.de
SUMMARY:Eisenstein Congruences at Prime-Square Level
DESCRIPTION:Jaclyn Lang (Temple University Philadelphia) \nIn Mazur’s celebrated Eisenstein ideal paper\, he studies congruences between prime-level cusp forms and the unique weight-2 Eisenstein series of the same level. He shows that (if p is at least 5) such mod-p congruences exist if and only if the level N is congruent to 1 modulo p. In this talk\, we consider Eisenstein–cuspidal congruences in weight 2 and level N2\, still under the condition that N = 1 mod p. In this case\, recent work with Pollack and Wake shows that the relevant level-N2 Hecke algebra is a free module over an appropriate inertia-at-N pseudodeformation ring. This structure turns out to be surprisingly powerful. One can recover Mazur’s existence theorem that there exists a mod-p Eisenstein–cuspidal congruence in weight 2 and prime level N when N = 1 mod p. One can also recover the results of Merel and Lecouturier that characterize the rank of Mazur’s Hecke algebra in terms of the order of vanishing of a certain zeta element in cases when that rank is at most 3.  We will discuss some of the ideas that go into these results.  In addition to the joint work with Pollack and Wake\, the later results are joint with Palvannan and Müller.
URL:https://crc326gaus.de/event/eisenstein-congruences-at-prime-square-level/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260612T153000
DTEND;TZID=Europe/Berlin:20260612T170000
DTSTAMP:20260527T052040
CREATED:20260319T100329Z
LAST-MODIFIED:20260319T100329Z
UID:12877-1781278200-1781283600@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Federico Binda (Milano): tba \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl)
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-34/
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:20260615T101500
DTEND;TZID=Europe/Berlin:20260615T114500
DTSTAMP:20260527T052040
CREATED:20260421T092343Z
LAST-MODIFIED:20260421T092343Z
UID:13157-1781518500-1781523900@crc326gaus.de
SUMMARY:de Rham-Witt Complex
DESCRIPTION:Klaus Mattis \n§9: The derived de Rham-Witt complex 1/2 \nAlternative description of the de Rham–Witt complex. More general criterion for when it can recover the de Rham complex. Define the derived de Rham–Witt and derived de Rham complexes (Construction 9.2.5\, Variant 9.2.6) and the conjugate filtration (Remark 9.2.7). Discuss Theorem 9.3.1 (the saturated de Rham–Witt complex in terms of the derived one). Prove Corollary 9.3.5 as an application. Prove Theorem 9.4.1 and Proposition 9.4.6.
URL:https://crc326gaus.de/event/de-rham-witt-complex-7/
LOCATION:Mainz\, Hilbertraum (05-432)
CATEGORIES:GAUS-AG
ORGANIZER;CN="Tom Bachmann":MAILTO:tom.bachmann@uni-mainz.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260616T160000
DTEND;TZID=Europe/Berlin:20260616T170000
DTSTAMP:20260527T052040
CREATED:20260416T144303Z
LAST-MODIFIED:20260421T110533Z
UID:13097-1781625600-1781629200@crc326gaus.de
SUMMARY:International Seminar on Automorphic Forms
DESCRIPTION:tba\nTrajan Hammonds (Aarhus) \nZoom (680 4828 0736\, The password is the first Fourier coefficient of the modular j-function (as digits)).
URL:https://crc326gaus.de/event/international-seminar-on-automorphic-forms-17/
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260618T090000
DTEND;TZID=Europe/Berlin:20260618T110000
DTSTAMP:20260527T052040
CREATED:20260407T112157Z
LAST-MODIFIED:20260428T101935Z
UID:13010-1781773200-1781780400@crc326gaus.de
SUMMARY:Poincaré-Dualität in Charakteristik p
DESCRIPTION:Vortrag 8: Gerstenauflösung I – Immanuel Klevesath
URL:https://crc326gaus.de/event/poincare-dualitat-in-charakteristik-p-8/
LOCATION:Heidelberg\, Mathematikon\, SR 8\, Heidelberg\, Germany
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260618T111500
DTEND;TZID=Europe/Berlin:20260618T124500
DTSTAMP:20260527T052040
CREATED:20260324T095438Z
LAST-MODIFIED:20260428T094146Z
UID:12902-1781781300-1781786700@crc326gaus.de
SUMMARY:The K-Theory of Z/p^n
DESCRIPTION:Talk 8: Relative-to-absolute descent II – Chenyi Yang (Universität Heidelberg)
URL:https://crc326gaus.de/event/gaus-ag-the-k-theory-of-z-pn/
LOCATION:Heidelberg\, Mathematikon\, SR 8 and Zoom\, INF 205\, Heidelberg\, Germany
CATEGORIES:GAUS-AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260619T133000
DTEND;TZID=Europe/Berlin:20260619T143000
DTSTAMP:20260527T052040
CREATED:20260519T104110Z
LAST-MODIFIED:20260519T104110Z
UID:13427-1781875800-1781879400@crc326gaus.de
SUMMARY:On arithmetical surjectivity and the Conjecture of Colliot-Thelene
DESCRIPTION:Florian Pop (University of Pennsylvania) \nThe notion of ‘arithmetical surjectivity’ (a.s.) for dominant morphisms f of proper smooth varieties over number fields was introduced by Colliot-Thelene\, and he made a precise\nconjecture (CCT) relating a.s. to birational properties of the morphisms f. The CCT was proved in a sharper form by Denef (2019)\, and Loughran-Skorobogatov-Smeets gave a\ncharacterization of a.s. (2020). I will present a new method of proof which allows generalizations/refinements of the above results by: First\, allowing k to be any finitely generated base fields k with char(k)=0 (and beyond). Second\, showing that a.s. is a fully birational property\, i.e.\, a.s. depends only on properties of the function field extension defined by morphisms f. The method of proof also yields generalizations of the so called\nzero-cycle surjectivity\, considered/characterized over number fields by Gvirtz (2020).\nNOTE: The problems are completely open in positive characteristic!
URL:https://crc326gaus.de/event/on-arithmetical-surjectivity-and-the-conjecture-of-colliot-thelene/
LOCATION:Heidelberg\, Mathematikon\, SR A and Livestream
CATEGORIES:GAUS-Seminar
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260619T153000
DTEND;TZID=Europe/Berlin:20260619T170000
DTSTAMP:20260527T052040
CREATED:20260319T100422Z
LAST-MODIFIED:20260520T110437Z
UID:12879-1781883000-1781888400@crc326gaus.de
SUMMARY:Seminar on Arithmetic Geometry
DESCRIPTION:Louisa Bröring (Duisburg-Essen): Quadratic Euler Characteristic of Geometrically Cyclic Branched Coverings \nThe quadratic Euler characteristic $\chi(X)$ of a smooth\, projective scheme\n$X$ over a field $k$ of characteristic not two is a refinement of the\ntopological Euler characteristic to quadratic forms\, constructed using motivic\nhomotopy theory. For example\, if $k\subset \mathbb{R}$\, then rank of $\chi(X)$\nis equal to the topological Euler characteristic of $X(\mathbb{C})$ and the\nsignature of $\chi(X)$ with respect to the given embedding is equal to the\ntopological Euler characteristic of $X(\mathbb{R})$. The quadratic Euler\ncharacteristic plays an import role in the programme of $\mathbb{A}^1$-refined\nenumerative geometry. \nAfter briefly introducing the quadratic Euler characteristic\, we present a\ncomputation of the quadratic Euler characteristic of geometrically cyclic\nbranched coverings leveraging Levine’s quadratic Riemann-Hurwitz formula. An\n$n$-fold geometrically cyclic branched covering is a morphism $f\colon Y \to\nX$ between smooth\, projective schemes together with a smooth\, closed subscheme\n$Z \subset X$ satisfying the following condition: there exists a line bundle\n$L$ over $X$ and a section $s \colon X \to L^{\otimes n}$ such that $Z$ is the\nzero locus of $s$ and $f$ is the pullback along $s$ of the map $L \to\nL^{\otimes n}$ taking $n$-th powers. \nAs an application\, we compute the quadratic Euler characteristic of branched\ndouble covers of $\mathbb{P}^2$\, which includes some K3 surfaces. \nZoom (635 7328 0984\, Kenncode: kleinste sechsstellige Primzahl)
URL:https://crc326gaus.de/event/seminar-on-arithmetic-geometry-35/
LOCATION:Darmstadt\, Room 401 and Zoom\, Schlossgartenstraße 7\, Darmstadt\, 64289\, Germany
CATEGORIES:GAUS-Seminar
ORGANIZER;CN="Sabrina Pauli":MAILTO:pauli@mathematik.tu-darmstadt.de
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260622T101500
DTEND;TZID=Europe/Berlin:20260622T114500
DTSTAMP:20260527T052040
CREATED:20260421T100218Z
LAST-MODIFIED:20260421T100218Z
UID:13159-1782123300-1782128700@crc326gaus.de
SUMMARY:de Rham-Witt complex
DESCRIPTION:Daniel Fink \n§9: The derived the Rham-Witt complex 2/2 \nBy the criterion of the previous talk\, the de Rham–Witt complex recovers the de Rham complex for a more general class of rings. Cover §9.5\, in particular Theorem 9.5.6\, Corollary 9.5.19\, and Theorem 9.5.21.
URL:https://crc326gaus.de/event/de-rham-witt-complex-8/
LOCATION:Mainz\, Hilbertraum (05-432)
CATEGORIES:GAUS-AG
ORGANIZER;CN="Tom Bachmann":MAILTO:tom.bachmann@uni-mainz.de
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BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20260623T160000
DTEND;TZID=Europe/Berlin:20260623T170000
DTSTAMP:20260527T052040
CREATED:20260416T144354Z
LAST-MODIFIED:20260421T110453Z
UID:13096-1782230400-1782234000@crc326gaus.de
SUMMARY:International Seminar on Automorphic Forms
DESCRIPTION:tba\nNoam Kimmel (MPIM Bonn) \nZoom (680 4828 0736\, The password is the first Fourier coefficient of the modular j-function (as digits)).
URL:https://crc326gaus.de/event/international-seminar-on-automorphic-forms-18/
CATEGORIES:GAUS-AG
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