The Bernstein-Sato zero-locus and Sabbah specialization conjecture

Let F=(f1,3ellots,fr)F=(f_1, 3ellots,f_r) be a collection of non-zero polynomials on X=CnX=\mathbb{C}^n, let D=j=1rV(fj)D=\bigcup_{j=1}^rV(f_j), and let BF,xB_{F,x} denote the local Bernstein-Sato ideal at xDx\in D. Let

Exp:Cr(C)r,3xexp(2πix),\operatorname{Exp}:\mathbb{C}^r\longrightarrow(\mathbb{C}^*)^r, 3\qquad x\longmapsto\exp(2\pi i x),

and let ψF\psi_F be the Sabbah specialization functor, with uniform support Suppxunif(ψFCX)(C)r\operatorname{Supp}^{\mathrm{unif}}_x(\psi_F\mathbb{C}_X)\subset(\mathbb{C}^*)^r. Bernstein-Sato specialization conjecture.

Exp(V(BF,x))=yD near xSuppyunif(ψFCX).\operatorname{Exp}(V(B_{F,x}))=\bigcup_{y\in D\text{ near }x}\operatorname{Supp}^{\mathrm{unif}}_y(\psi_F\mathbb{C}_X).

This is proposed as a multivariable generalization of the Kashiwara–Malgrange relation between Bernstein-Sato roots and Milnor-fiber monodromy eigenvalues. The statement connects algebraic Bernstein-Sato ideals with cohomology support loci of local systems, but its general validity remains open.

Sources & referencesView supporting material

Primary source

Nero Budur, “Bernstein-Sato ideals and local systems”, arXiv:1209.3725 (2013).

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