General factorization conjecture for cyclic block partitions

Fix an ordered set partition S=(S1,,Sk)\mathbf{S}=(S_1,\ldots,S_k) of {1,,n}\{1,\ldots,n\} into kk cyclically contiguous interval blocks. Let dd be the number of blocks with size at least 22, and let NS\mathcal{N}_{\mathbf{S}} denote the associated set of distinct nonzero kinematic blades.

Block-partition factorization conjecture. There is an ordering (T1,,T(d1)(k1)1,S)(\mathbf{T}_1,\ldots,\mathbf{T}_{(d-1)(k-1)-1},\mathbf{S}) with {T1,,T(d1)(k1)1}=NS\{\mathbf{T}_1,\ldots,\mathbf{T}_{(d-1)(k-1)-1}\}=\mathcal{N}_{\mathbf{S}} such that the iterated residue is nonzero and

Resη(T(d1)(k1)1)=0 ⁣(Resη(T1)=0 ⁣(Resη(S)=0(mn(k))))==1dmn(k),\operatorname{Res}_{\eta_{(\mathbf{T}_{(d-1)(k-1)-1})}=0}\!\left(\cdots\operatorname{Res}_{\eta_{(\mathbf{T}_1)}=0}\!\left(\operatorname{Res}_{\eta_{(\mathbf{S})}=0}(m^{(k)}_n)\right)\cdots\right)=\prod_{\ell=1}^{d}m^{(k)}_{n_\ell},

under a suitable identification of kinematic parameters, where n1++nd=n+d(k1)n_1+\cdots+n_d=n+d(k-1).

This extends the explicit factorization proposal to arbitrary kk and block degeneracies. The supplied text gives no resolution, so the conjecture remains open.

Sources & referencesView supporting material

Primary source

Nick Early, “Factorization for Generalized Biadjoint Scalar Amplitudes via Matroid Subdivisions”, arXiv:2211.16623 (2023).

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