Partial flag cluster algebras reproduce a large part of the two-loop five- and six-point massless scattering symbol alphabets, with the momentum twistor embedding stronger at six points after permutation completion.
Each quadratic letter is of the form Qi,j;k,l;m = si,j − sk,l (37) for {i, j, k, l, m} = {1, 2, 3, 4, 5}
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Singularities of massless scattering and cluster algebras
Partial flag cluster algebras reproduce a large part of the two-loop five- and six-point massless scattering symbol alphabets, with the momentum twistor embedding stronger at six points after permutation completion.