Scattering equations: from projective spaces to tropical grassmannians by Cachazo, Freddy, Early, Nick, Guevara, Alfredo, Mizera, Sebastian

“…We compute all ‘biadjoint amplitudes’ for (k, n) = (3, 6) and find a direct connection to the tropical Grassmannian. This leads to the notion of k = 3 Feynman diagrams. …”
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On-shell structures of MHV amplitudes beyond the planar limit by Arkani-Hamed, Nima, Bourjaily, Jacob L., Cachazo, Freddy, Postnikov, Alexander, Trnka, Jaroslav

“…This is understood in terms of an extended notion of positivity in G(2, n), the Grassmannian of 2-planes in n dimensions: a single on-shell diagram can be associated with many different “positive” regions, of which the familiar G [subscript +](2, n) associated with planar diagrams is just one example. …”
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