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NCTS Seminar on Algebraic Geometry
14:00 - 15:00, November 16, 2018 (Friday)
Room 440, Astronomy-Mathematics Building, NTU
(台灣大學天文數學館 440室)
The Category of B-branes and Bridgeland Stability
Hung-Yu Yeh (Academia Sinica)


In physics, string theory contains open strings whose world sheet has non-trivial boundaries, and the ends of open strings with Dirichlet boundary conditions called D-branes can be embedded into submanifolds of the target space. In topological string theories, D-branes can naturally be considered as objects in a category and the morphisms are graded cohomological class. Precisely, the category of A-branes looks like the Fukaya category and the category of B-branes like the derived category of coherent sheaves. 
Thus for the D-branes, considered as particles, we need suitable definition of the binding process, the formation or decay, called -stability proposed by Douglas. Motivated by Douglas's work Bridgeland made a precise definition of stability on triangulated categories. So in this talk I would introduce the category of B-branes and the relevant Bridgeland stability, and, if time permitted, I would discuss some of  my recent work in Bridgeland stability (In progress). 


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