CMSA Combinatorics, Physics and Probability Seminar: BCFW recursion relations and non-planar positive geometry


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April 12, 2022 9:30 am - 10:30 am
CMSA, 20 Garden St, G10
Address: 20 Garden Street, Cambridge, MA 02138

Jaroslav Trnka - UC Davis, Department of Physics and Astronomy

There is a close connection between the scattering amplitudes in planar N=4 SYM theory and the cells in the positive Grassmannian. In the context of BCFW recursion relations the tree-level S-matrix is represented as a sum of planar on-shell diagrams (aka plabic graphs) and associated with logarithmic forms on the Grassmannian cells of certain dimensionality. In this talk, we explore non-adjacent BCFW shifts which naturally lead to non-planar on-shell diagrams and new interesting subspaces inside the real Grassmannian.

 in person – CMSA, 20 Garden St, Room G10

via Zoom – register at:  CMSA Combinatorics, Physics and Probability Seminar