The formal scalelessness conjecture for monomials in Feynman integral families

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Let I(z1,…,zn)I(z_1,\ldots,z_n) be an LL-loop integral with nonnegative indices, and let D1,…,DnD_1,\ldots,D_n be the propagator generators in the associated noncommutative rational double-shift algebra. For a sector with n−un-u active propagators, a monomial D1i1⋯Dn−uin−uD_1^{i_1}\cdots D_{n-u}^{i_{n-u}} is formally scaleless with respect to I(1,…,1⏟n−u,0,…,0⏟u)I(\underbrace{1,\ldots,1}_{n-u},\underbrace{0,\ldots,0}_u) when its normal form under the Gröbner basis GG vanishes after setting z1=⋯=zn−u=1z_1=\cdots=z_{n-u}=1 and zn−u+1=⋯=zn=0z_{n-u+1}=\cdots=z_n=0. Formal scalelessness conjecture. A monomial D1i1⋯DninD_1^{i_1}\cdots D_n^{i_n} is formally scaleless if and only if

I(1−i1,…,1−in−u,−in−u+1,…,−in)I(1-i_1,\ldots,1-i_{n-u},-i_{n-u+1},\ldots,-i_n)

is scaleless. Scaleless integrals vanish in dimensional regularization, so this would identify formally scaleless monomials algebraically with integrals that vanish because the corresponding sector has no mass scale. The source presents this as a conjecture motivated by computations in the noncommutative rational double-shift algebra; no resolution is supplied.

References

Primary source

Mohamed Barakat, Robin Brüser, Claus Fieker, Tobias Huber and Jan Piclum, “Feynman integral reduction using Gröbner bases”, arXiv:2210.05347 (2023).

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