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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

Speaker: Ruxuan Zhang (SCMS, Fudan University) Abstract: The D-equivalence conjecture predicts that birational Calabi–Yau varieties have equivalent bounded derived category of coherent sheaves. We proved that this conjecture holds for any hyperKähler varieties of K3[n]-type. The proof relies on Markman’s projectively hyperholomorphic bundles, which are constructed from BKR equivalences. Firstly, I will talk about some …

SIMIS Seminar on Algebraic Geometry: ON THE D-EQUIVALENCE CONJECTURE FOR HYPER-KÄHLER VARIETIES 查看全文 »

Speaker: Hang Yuan (BIMSA) Abstract: Given a Lagrangian fibration, we propose that the dual torus fibration, for a precise formulation of the SYZ conjecture, should be interpreted as a non-Archimedean torus fibration defined over the Novikov field. This proposal comes from a toy model of the SYZ duality between the complex logarithm map and the …

SIMIS Seminar on Derived and Noncommutative Geometry: On a mathematical formulation of Strominger-Yau-Zaslow conjecture 查看全文 »