Fuss–Catalan enumeration and construction of regions for AnϕpA^{\phi^p}_n

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Place n−2n-2 points labeled 0,1,…,n−30,1,\ldots,n-3 in increasing order on the real line, and let H(x)H(x) be the function in the global Schwinger formula for AnϕpA^{\phi^p}_n. For a non-crossing (p−2)(p-2)-chord θa1,a2,…,ap−2\theta_{a_1,a_2,\ldots,a_{p-2}}, associate the equalities xa1=xa2=⋯=xap−2x_{a_1}=x_{a_2}=\cdots=x_{a_{p-2}}; if it surrounds θb1,b2,…,bp−2\theta_{b_1,b_2,\ldots,b_{p-2}}, impose the corresponding strict inequality between the two common values. Fuss–Catalan region conjecture. The regions contributing to AnϕpA^{\phi^p}_n are in bijection with the FC(n−2)/(p−2)(p−2,1)\textrm{FC}_{(n-2)/(p-2)}(p-2,1) possible non-crossing (p−2)(p-2)-chord diagrams, and the region associated with each diagram is obtained by these equalities and nesting inequalities. These regions are all the solutions to H(x)=0H(x)=0, and their contributions produce all the FC(n−2)/(p−2)(p−1,1)\textrm{FC}_{(n-2)/(p-2)}(p-1,1) trees of ϕp\phi^p. The supplied text gives no evidence that this conjectural classification and enumeration has been resolved.

References

Primary source

Freddy Cachazo and Bruno Giménez Umbert, “Connecting Scalar Amplitudes using The Positive Tropical Grassmannian”, arXiv:2205.02722 (2022).

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