4/12/2022 Combinatorics, Physics and Probability Seminar

Jaroslav Trnka (UC Davis, Department of Physics and Astronomy) **

Title: BCFW recursion relations and non-planar positive geometry

Abstract: 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. 

**This talk will be hybrid. Talk will be held at CMSA (20 Garden St) Room G10.

All non-Harvard affiliated visitors to the CMSA building will need to complete this covid form prior to arrival.


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