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−  Wednesday 3:30pm4:30pm VV B139  +  Wednesday 3:30pm5:00pm VV B139 
   
 *If you would like to talk in the seminar but have difficulty with adding information here, please contact [http://www.math.wisc.edu/~dwang Dongning Wang]   *If you would like to talk in the seminar but have difficulty with adding information here, please contact [http://www.math.wisc.edu/~dwang Dongning Wang] 
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 !align="left"  host(s)   !align="left"  host(s) 
     
−  Sept. 21st  +  date 
−  Ruifang Song  +   name 
−   The PicardFuchs equations of CalabiYau hypersurfaces in partial flag varieties  +  Title 
     
     
−  Sept. 28st  +   
−  Ruifang Song  +   
−   The PicardFuchs equations of CalabiYau hypersurfaces in partial flag varieties(continued)  +   
−  
 
−  
 
−  Oct. 5th
 
−  Dongning Wang
 
−  Seidel Representation for Symplectic Orbifolds
 
−  
 
−  
 
−  Oct. 12th
 
−  Dongning Wang
 
−  Seidel Representation for Symplectic Orbifolds(continued)
 
−  
 
 }   } 
   
 == Abstracts ==   == Abstracts == 
   
−  '''Ruifang Song''' ''The PicardFuchs equations of CalabiYau hypersurfaces in partial flag varieties ''  +  '''name''' ''title '' 
   
−  Abstract  +  Abstract: 
   
−  We introduce a system of differential equations associated to a smooth algebraic variety X acted by a complex Lie group G and a Glinearlized line bundle L on X. We show that this system is holonomic and thus has finite dimensional solution space assuming G acts on X with finitely many orbits. When X is a partial flag variety, we show that this system gives the PicardFuchs system of CalabiYau hypersurfaces in X. In particular, when X is a toric variety, our construction recovers GKZ systems and extended GKZ systems, which have played important roles in studying periods of CalabiYau hypersurfaces/complete intersections in toric varieties. In general, if X is a Fano variety, L is the anticanonical line bundle and G=Aut(X), this construction can be used to study the PicardFuchs system of CalabiYau hypersurfaces/complete intersections in X.
 +  ??? 
   
−  '''Dongning Wang''' ''Seidel Representation for Symplectic Orbifolds''
 
   
−  For a symplectic manifold <math>(M,\omega)</math>, Seidel representation is a group morphism from <math>\pi_1(Ham(M,\omega))</math> to the multiplication group of the quantum cohomology ring <math>QH^*(M,\omega)</math>. With this morphism, once given enough information about <math>\pi_1(Ham(M,\omega))</math>, one can get compute <math>QH^*(M,\omega)</math>. On the other side, one would like to compute quantum cohomology of symplectic orbifolds defined by Chen and Ruan for many reasons, for example, to verify mirror symmetry between orbifolds and its mirror. With this motivation, we generalize Seidel representation to the orbifold cases. To do that, we need to generalize all the terminologies used to construct Seidel representation. For a symplectic orbifold <math>(\mathcal{X},\omega)</math>, we define loops of Hamiltonian diffeomorphisms, <math>\pi_1(Ham(\mathcal{X},\omega))</math>, Hamiltonian orbifiber bundles, and sectional pseudoholomorphic orbicurves into the bundle. In this talk, I will explain these definitions and use them to construct Seidel representation for orbifolds.
 
 ==Past Semesters ==   ==Past Semesters == 
 *[[ Spring 2011 Symplectic Geometry Seminar]]   *[[ Spring 2011 Symplectic Geometry Seminar]] 
 +  *[[ Fall 2011 Symplectic Geometry Seminar]] 
 +  *[[ Spring 2012 Symplectic Geometry Seminar]] 
 +  *[[ Fall 2012 Symplectic Geometry Seminar]] 
Latest revision as of 13:38, 4 February 2013
Wednesday 3:30pm5:00pm VV B139
 If you would like to talk in the seminar but have difficulty with adding information here, please contact Dongning Wang
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