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fables [2020/03/31 13:04]
fables [2021/10/24 16:34]
Ligne 3: Ligne 3:
 The normal starting time of this seminar is 16.30 on Monday. The normal starting time of this seminar is 16.30 on Monday.
 +  Nov 1, 16h15. Room 06-13
 +  Vasily Golyshev (Moscow, Bures-sur-Yvette) Modularity proofs via
 +  fibered motives.
 +This is a report on joint work with Don Zagier, and joint work
 +in progress with Kilian Bönisch and Albrecht Klemm.
 +The rigid Calabi-Yau threefolds that appear as conifold fibers
 +in the hypergeometric Landau-Ginzburg models of Fano
 +complete intersection fourfolds in [weighted] projective spaces
 +are expected to be modular, but what is lacking is the
 +construction of actual correspondences with Kuga-Sato
 +threefolds. I will explain how the technique of fibered motives
 +can be used to provide `opportunistic' modularity
 +proofs for such fibers.
 +  2020, Wednesday, May 20, 16:00 (CEST), Virtual seminar, Lionel Lang (Stockholm University)
 +Meeting ID: 592 872 9514  Password: (the number of lines on a cubic surface)
 +**Co-amoebas, dimers and vanishing cycles**
 +In this joint work in progress with J. Forsgård, we study the topology of maps P:(\C*)^2 \to \C given by Laurent polynomials P(z,w). 
 +For specific P, we observed that the topology of the corresponding map can be described in terms of the co-amoeba of a generic fiber. When the latter co-amoeba is maximal, it contains a dimer (a particularly nice graph) whose fundamental cycles corresponds to the vanishing cycles of the map P. For general P, the existence of maximal co-amoebas is widely open. In the meantime, we can bypass co-amoebas, going directly to dimers using a construction of Goncharov-Kenyon and obtain a virtual correspondence between fundamental cycles and vanishing cycles.
 +In this talk, we will discuss how this (virtual) correspondence can be used to compute the monodromy of the map P.
 +  2020, Tuesday, April 7, 17:00, Virtual seminar (EDGE seminar) Grigory Mikhalkin (Geneva)
 +Meeting ID: 870 554 816 Password: 014504 
 +**Area in real K3-surfaces**
 +Real locus of a K3-surfaces is a multicomponent topological surface. The canonical class provides an area form on these components (well defined up to multiplication by a scalar). In the talk we'll explore inequalities on total areas of different components as well a link between such inequalities and a class of real algebraic curves called simple Harnack curves. Based on a joint work with Ilia Itenberg.
   2020, Monday, March 31, 17:00, Virtual seminar, Vladimir Fock (Strasbourg)   2020, Monday, March 31, 17:00, Virtual seminar, Vladimir Fock (Strasbourg)
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-  2020, Monday, March 16, 16:30, Battelle, Alexander Veselov (Loughborough University)[POSTPONED TILL APRIL]+  2020, Monday, March 16, 16:30, Battelle, Alexander Veselov (Loughborough University)[POSTPONED]
 **On integrability, geometrization and knots** **On integrability, geometrization and knots**
fables.txt · Dernière modification: 2021/12/18 22:44 de kalinin0