Bernstein–Sato support conjecture for Sabbah's specialization complex

Let F=(f1,,fr):XCrF=(f_1,\ldots,f_r):X\rightarrow\mathbb{C}^r be a collection of non-invertible analytic functions on a complex manifold such that f1(0)f^{-1}(0) admits a finite Whitney stratification, where f=i=1rfif=\prod_{i=1}^r f_i. Define S(F)\mathcal{S}(F) as the support of Sabbah's specialization complex, and let Z(BF)\mathcal{Z}(B_F) be the zero locus of the Bernstein–Sato ideal of FF. Let

Exp:Cr(C)r,\operatorname{Exp}:\mathbb{C}^r\rightarrow(\mathbb{C}^*)^r,

be given by αexp(2πiα)\alpha\mapsto\exp(2\pi i\alpha). Bernstein–Sato support conjecture. One has

S(F)=Exp(Z(BF)).\mathcal{S}(F)=\operatorname{Exp}(\mathcal{Z}(B_F)).

This conjecture gives a Bernstein–Sato-ideal description of the support of Sabbah's specialization complex, avoiding a log resolution. The source indicates that one inclusion, S(F)Exp(Z(BF))\mathcal{S}(F)\subset\operatorname{Exp}(\mathcal{Z}(B_F)), has been proved; the equality is therefore solved.

Sources & referencesView supporting material

Primary source

Nero Budur, Yongqiang Liu, Luis Saumell and Botong Wang, “Cohomology support loci of local systems”, arXiv:1511.08013 (2016).

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