fables

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fables [2020/01/12 23:23] weronika |
fables [2020/05/10 17:37] (Version actuelle) weronika |
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The normal starting time of this seminar is 16.30 on Monday. | The normal starting time of this seminar is 16.30 on Monday. | ||

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+ | 2020, Wednesday, May 20, 16:00 (CEST), Virtual seminar, Lionel Lang (Stockholm University) | ||

+ | | ||

+ | https:// | ||

+ | Meeting ID: 592 872 9514 Password: (the number of lines on a cubic surface) | ||

+ | | ||

+ | **Co-amoebas, | ||

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+ | 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, | ||

+ | 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. | ||

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+ | ---- | ||

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+ | 2020, Tuesday, April 7, 17:00, Virtual seminar (EDGE seminar) Grigory Mikhalkin (Geneva) | ||

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+ | https:// | ||

+ | Meeting ID: 870 554 816 Password: 014504 | ||

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+ | **Area in real K3-surfaces** | ||

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+ | 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. | ||

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+ | ---- | ||

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+ | 2020, Monday, March 31, 17:00, Virtual seminar, Vladimir Fock (Strasbourg) | ||

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+ | https:// | ||

+ | Meeting ID: 737 573 471 | ||

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+ | **Higher measured laminations and tropical curves** | ||

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+ | We shall define a notion of a higher lamination - a graph embedded | ||

+ | into a Riemann surface with edges coloured by generators of an affine | ||

+ | Weyl group. This notion generalises the notion of the ordinary | ||

+ | integral measured lamination and on the other hand of a tropical | ||

+ | curve and can be constructed out of a integral Lagrangian submanifold | ||

+ | of the cotangent bundle. | ||

+ | |||

+ | ---- | ||

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+ | 2020, Monday, March 16, 16:30, Battelle, Alexander Veselov (Loughborough University)[POSTPONED] | ||

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+ | **On integrability, | ||

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+ | I will start with a short review of Liouville integrability in relation with Thurston’s geometrization programme, | ||

+ | using as the main example the geodesic flows on the 3-folds with SL(2, | ||

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+ | A particular case of such 3-folds the modular quotient SL(2, | ||

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+ | The talk is partly based on a recent joint work with Alexey Bolsinov and Yiru Ye. | ||

+ | |||

+ | ---- | ||

2020, Monday, February 17, 16:30, Battelle, Karim Adiprasito | 2020, Monday, February 17, 16:30, Battelle, Karim Adiprasito |

fables.1578867838.txt.gz · Dernière modification: 2020/01/12 23:23 de weronika