Geometry Seminar


Dichotomy of uniruled

symplectic submanifolds


Professor RUAN Yong Bin

University of Michigan




Symplectic birational geometry studies uniruled manifolds and uniruled submanifolds. This talk will focus on uniruled submanifolds. The main conjecture is that there is a dichotomy for such a special submanifold depending on its normal bundle. Namely, if the normal bundle is non-negative in some sense, the ambient manifold should be uniruled. Otherwise, there should be a symplectic surgery to remove the submanifold. We will present a solution to the conjecture for the case of divisor.




March 26, 2008 (Wednesday)


2:00 – 3:00pm


Room 517, Meng Wah Complex, HKU




All are welcome