General factorization conjecture for cyclic block partitions

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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(d−1)(k−1)−1,S)(\mathbf{T}_1,\ldots,\mathbf{T}_{(d-1)(k-1)-1},\mathbf{S}) with {T1,…,T(d−1)(k−1)−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

Res⁡η(T(d−1)(k−1)−1)=0 ⁣(⋯Res⁡η(T1)=0 ⁣(Res⁡η(S)=0(mn(k)))⋯ )=∏ℓ=1dmnℓ(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(k−1)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.

References

Primary source

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

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