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Speaker: Yingdi Qin (SIMIS) Abstract: Kapustin and Orlov first notice that the D-branes of the Topological A-model (Fukaya category) are not necessarily supported on Lagragian submanifolds, certain coisotropic branes are also allowed. M.Gualtieri later generalizes the concept of coisotropic branes to generalized complex geometry, in which are called generalized complex branes. In this talk, I …

SIMIS Seminar on Derived and Noncommutative Geometry: Generalized Complex Geometry in terms of Shifted Symplectic Holomorphic Stack 查看全文 »

Speaker: Xinan Zhou Abstract: I will consider 4d N=4 SYM on real projective space preserving half of supersymmetry and focus on the case where charge conjugation is gauged.The holographic dual of this setup is a Z2 quotient of AdS5xS5 with an O1 orientifold.I will discuss how to use analytic conformal bootstrap techniques to compute all …

SIMIS+ShanghaiTech Joint Seminar on Theoretical Physics: Correlators of N=4 SYM on real projective space at strong coupling 查看全文 »

Speaker: Fernando Alday Abstract: I will describe recent progress in computing tree-level string amplitudes on curved AdS backgrounds, denoted AdS Virasoro-Shapiro amplitudes.In particular,we will discuss two limits,the Regge and high energy limits,where the amplitude can be computed in an explicit form. Time: 1:30-4:00 pm, Oct.21,2024 Location: Auditorium (18th floor) at SIMIS, Block A, No. 657 …

SIMIS+ShanghaiTech Joint Seminar on Theoretical Physics: The AdS Virasoro-Shapiro amplitude at high energies 查看全文 »

Speaker : Javad Mohammadkarimi Host: Huaxin Lin Abstract: In this talk, I give some information about the known uniform property Gamma for C*-algebras. Also, I talk about a version of the uniform property Gamma which is defined in a more general setting. Time: 2:30-3:30pm, Thursday, October 10th, 2024 Location: Room 1510, Block A, No. 657 Songhu Road, …

An operator algebras seminar at SIMIS: Introduction to uniform property Gamma 查看全文 »

Speaker: Fei Si (Xi’an Jiaotong University) Abstract: Cohomology of moduli spaces of 1 dimensional sheaves on del Pezzo surfaces X is expected to refine enumerative geometry of the local Calabi-Yau 3-folds Tot(ω_X). On the one hand, the normalized generators of the cohomology of moduli space will induce Chern filtration on the cohomology. On the other …

SIMIS Seminar on Algebraic Geometry: COHOMOLOGICAL ASPECT OF MODULI OF 1D SHEAVES ON SURFACES 查看全文 »

Speaker: Andrea Seppi (the Institut Fourier of Grenoble) Abstract: The Asymptotic Plateau Problem in the hyperbolic space is the problem of existence of minimal surfaces with a prescribed Jordan curve as a boundary “at infinity”. Since the work of Anderson in the 1980s, it is known to have a solution, which is however in general …

Geometry and Topology Seminar of Fudan & Simis: Uniqueness and non-uniqueness for the Asymptotic Plateau Problem in hyperbolic three-space 查看全文 »

Lecturer: Tianqing Zhu (YMSC, Tsinghua) Abstract: K-theoretic quasimap counting to quiver varieties is one of the core subject in the enumerative geometry. It turns out that it is connected to the representation theory of the Maulik-Okounkov quantum affine algebra via the stable envelopes. It has long been conjectured that the Maulik-Okounkov quantum affine algebra is …

Mini course on theoretical and mathematical physics: Quantum toroidal algebras, quantum difference equations and stable envelopes 查看全文 »

Speaker: Liang Guo Host: Huaxin Lin Abstract: In this talk, we will introduce a notion of a coarse algebra associated with a metric space, and construct the twisted Roe algebras and a twisted coarse Baum-Connes assembly map associated with this coarse algebra. We will cover basic properties of the twisted Roe algebras and the K-theory …

An operator algebras seminar at SIMIS: Twisted Roe algebras and their K-theory 查看全文 »

Speaker: Thomas Strobl Abstract: Koszul-Tate resolutions are the key ingredient in the Batalin-Vilkovisky (BV) and the Batalin-Fradkin-Vilkovisky (BFV) formalisms. Such resolutions have been known explicitly only in a very limited number of cases. And while the Tate algorithm shows existence, it almost always leads to an infinite amount of computations to be performed. We provide …

Decorated trees for Koszul-Tate resolutions and ghosts 查看全文 »

Host: Chongqing Cheng Abstract: A series of seminars on some issues related to Hamiltonian dynamical systems. Time: 14:00~16:00, Thursday (every week, since Sept. 26) Location: Room 1310, Block A, No. 657 Songhu Road, Yangpu District, Shanghai