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SIMIS Seminar on Field Theory and String Theory: B-brane transport in nonabelian GLSMs and its applications
Speaker: Jirui Guo (Tongji University) Abstract: B-branes are the boundary conditions of gauged linear sigma models (GLSM) compatible with B-type topological twist. Their categorical structure provides a powerful tool in analysing the phases of the GLSMs. A transport of the brane from one phase to another realizes an explicit faithful functor between the two phases. …
Symmetries Of Algebraic Manifolds
Speaker: DE-QI ZHANG (NUS) Abstract: In the first 60 min of the 2h lecture (for year-one graduates), we introduce the projective variety, affine variety, morphisms between varieties, and the Néron-Severi group. In the second half of the lecture (for year-two onwards graduates), we introduce the Kawaguchi-Silverman conjecture (KSC) about the equivalence of dynamical degree and …
SIMIS Seminar on Field Theory and String Theory: Orientifold Calabi-Yau threefolds: divisor exchanges and reflections
Speaker: Xin Gao (Sichuan University) Abstract: We systematically constructed orientifold Calabi-Yau threefolds, encompassing both divisor exchange and multiple divisor reflection involutions. Expanding our classification, we reached h^{1,1}(X)=12 using a database from the Kreuzer-Skarke list. We identified 156,509 proper divisor exchange involutions, and explored over 1 billion reflection types. Under these involutions, we clarified some ambiguities …
SIMIS Seminar on Field Theory and String Theory: Bootstrapping the Abelian Lattice Gauge Theories
Speaker: Zhijin Li (Southeast University) Abstract: In this talk, I will introduce a recent bootstrap study of the Z2 and U(1) Abelian lattice gauge theories, for which the loop equations and positivity conditions are employed for Wilson loops with lengths L ⩽ Lmax to derive two-sided bounds on the Wilson loop averages. I will address …
SIMIS Seminar on Field Theory and String Theory: A loop group valued Frobenius period map for a mod $p$ Shimura variety
Speaker: Qijun Yan (BIMSA) Abstract: In this talk, I will describe a variant of the zip period map of the special fibre of a Shimura variety (of good reduction) which defines the Ekedahl-Oort strata of S. The target of the period map is the moduli stack of 1-1 truncated local Shtukas. If time permits, I …
SIMIS Seminar on Field Theory and String Theory: Partial entanglement network and geometry reconstruction in AdS/CFT
Speaker: Qiang Wen (YAUC, Southeast University) Abstract: We give a scheme to geometrize the partial entanglement entropy (PEE) in AdS/CFT on a time slice in generic dimensions. More explicitly, the two point PEE is represented by bulk geodesics, which we call the PEE threads. The density of the PEE threads is determined by the physical …
SIMIS Seminar on Geometric Analysis and PDEs: Some long time existence and convergence results on hypersymplectic flow
Speaker: Yao Chengjian (ShanghaiTech University) Abstract: Hypersymplectic structure on a 4-manifold is a triple of symplectic forms such that any nontrivial linear combination of them is symplectic. The hypersymplectic flow is a natural geometric flow designed with the goal of deforming one given hypersymplectic structure in its cohomology class to a hyperKahler structure. This flow also has close relation with …
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