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Categorification of 2d cohomological Hall algebras
Categorification of 2d cohomological Hall algebras
Tuesday 17 September 2019
Tuesday 17 September 2019
Speaker: Francesco Sala (IPMU Tokyo)
Location: J11
Time: 2.00pm
Partitions and Hilbert schemes of points
Partitions and Hilbert schemes of points
Tuesday 1 October 2019
Tuesday 1 October 2019
Speaker: Paul Johnson (Sheffield)
Location: J11
Time: 12.00pm
Abstract: This will be a gentle, expository talk explaining some connections between the two objects in the title.
A Mayer-Vietoris theorem for Gromov-Witten theory
A Mayer-Vietoris theorem for Gromov-Witten theory
Tuesday 8 October 2019
Tuesday 8 October 2019
Speaker: Dhruv Ranganathan (Cambridge)
Location: J11
Time: 12.00pm
The Stability Manifold of a Contraction Algebra
The Stability Manifold of a Contraction Algebra
Tuesday 15 October 2019
Tuesday 15 October 2019
Speaker: Jenny August (MPIM Bonn)
Location: J11
Time: 12.00pm
Quasimodular forms from Betti numbers
Quasimodular forms from Betti numbers
Thursday 17 October 2019
Thursday 17 October 2019
Speaker: Pierrick Bousseau (ETH)
Location: J11
Time: 3.00pm
Abstract: I will explain how to construct quasimodular forms starting from Betti numbers of moduli spaces of dimension 1 coherent sheaves on P2. This gives a proof of some stringy predictions about the refined topological string theory of local P2 in the Nekrasov-Shatashvili limit. Partly based on work in progress with Honglu Fan, Shuai Guo, and Longting Wu.
The Gamma and SYZ conjectures: a tropical approach to periods
The Gamma and SYZ conjectures: a tropical approach to periods
Tuesday 22 October 2019
Tuesday 22 October 2019
Speaker: Nick Sheridan (Edinburgh)
Location: J11
Time: 12.00pm
K-theoretic Donaldson-Thomas theory and the Hilbert scheme of points on a surface
K-theoretic Donaldson-Thomas theory and the Hilbert scheme of points on a surface
Tuesday 29 October 2019
Tuesday 29 October 2019
Speaker: Noah Arbesfeld (Imperial College London)
Location: J11
Time: 12.00pm
Abstract: Tautological bundles on Hilbert schemes of points often enter into enumerative and physical computations.
Strong positivity for quantum cluster algebras
Strong positivity for quantum cluster algebras
Tuesday 5 November 2019
Tuesday 5 November 2019
Speaker: Ben Davison (Edinburgh)
Location: J11
Time: 12.00pm
Abstract: I will discuss the positivity for quantum theta functions, a result of joint work with Travis Mandel.
Stability conditions on the derived category of coherent systems and Brill-Noether theory
Stability conditions on the derived category of coherent systems and Brill-Noether theory
Thursday 21 November 2019
Thursday 21 November 2019
Speaker: Soheyla Feyzbakhsh (Imperial College London)
Location: J11
Time: 12.00pm
Abstract: A classical method to study Brill-Noether locus of higher rank semistable vector bundles on curves is to examine the stability of coherent systems.
Non-archimedean and motivic integrals on the Hitchin fibration
Non-archimedean and motivic integrals on the Hitchin fibration
Tuesday 3 December 2019
Tuesday 3 December 2019
Speaker: Dimitri Wyss (École Polytechnique Fédérale de Lausanne)
Location: J11
Time: 12.00pm
Higher SL(k)-friezes
Higher SL(k)-friezes
Tuesday 10 December 2019
Tuesday 10 December 2019
Speaker: Sira Gratz (Glasgow)
Location: J11
Time: 12.00pm
Intersection theory of derived stacks
Intersection theory of derived stacks
Wednesday 11 December 2019
Wednesday 11 December 2019
Speaker: Adeel Khan (Regensburg)
Location: LT-B
Time: 3.00pm
Abstract: I will discuss how various formalisms of intersection theory (Chow groups, K-theory, cobordism) can be extended to the setting of derived schemes and stacks. This gives a new approach to virtual phenomena such as the virtual fundamental class and virtual Riemann-Roch formulas.
Generalisation of the Givental theory for the open WDVV equations
Generalisation of the Givental theory for the open WDVV equations
Wednesday 18 December 2019
Wednesday 18 December 2019
Speaker: Alexandr Buryak (Leeds)
Location: J11
Time: 2.00pm
Abstract: The WDVV equations, also called the associativity equations, is a system of non-linear partial differential equations for one function that describes the local structure of a Frobenius manifold.
Smoothing toroidal crossing varieties
Smoothing toroidal crossing varieties
Tuesday 28 January 2020
Tuesday 28 January 2020
Speaker: Helge Ruddat (Mainz)
Location: J11
Time: 12.00pm
Quantum modularity
Quantum modularity
Tuesday 18 February 2020
Tuesday 18 February 2020
Speaker: William Mistegaard (IST Austria)
Location: F24
Time: 12.00pm
Cancelled - Etienne Mann (Angers)
Cancelled - Etienne Mann (Angers)
Tuesday 17 March 2020
Tuesday 17 March 2020
Speaker: Etienne Mann (Angers)
Location: F24
Time: 12.00pm
Tropical multiplicities from polyvector fields and QFT
Tropical multiplicities from polyvector fields and QFT
Tuesday 21 April 2020
Tuesday 21 April 2020
Speaker: Travis Mandel (Edinburgh)
Time: 3.30pm UK time
Online: ZOOM Meeting ID: 762 8025 8504, ask for password.
Piotr Sulkowski (Warsaw)
Piotr Sulkowski (Warsaw)
Tuesday 28 April 2020
Tuesday 28 April 2020
Speaker: Piotr Sulkowski (Warsaw)
Time: 2.00pm UK time
Prelog Chow rings and stable irrationality in semistable degenerations
Prelog Chow rings and stable irrationality in semistable degenerations
Tuesday 5 May 2020
Tuesday 5 May 2020
Speaker: Michel van Garrel (Warwick)
Time: 3.30pm UK time
Quantum differential equations and helices.
Quantum differential equations and helices.
Tuesday 19 May 2020
Tuesday 19 May 2020
Speaker: Giordano Cotti (Birmingham)
Time: 2.00pm UK time
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