Abstract
A log generic hypersurface in \(\mathbb {P}^n\) with respect to a birational modification of \(\mathbb {P}^n\) is by definition the image of a generic element of a high power of an ample linear series on the modification. A log very-generic hypersurface is defined similarly but restricting to line bundles satisfying a non-resonance condition. Fixing a log resolution of a product \(f=f_1\ldots f_p\) of polynomials, we show that the monodromy conjecture, relating the motivic zeta function with the complex monodromy, holds for the tuple \((f_1,\ldots ,f_p,g)\) and for the product fg, if g is log generic. We also show that the stronger version of the monodromy conjecture, relating the motivic zeta function with the Bernstein–Sato ideal, holds for the tuple \((f_1,\ldots ,f_p,g)\) and for the product fg, if g is log very-generic. Even the case \(f=1\) is intricate, the proof depending on nontrivial properties of Bernstein–Sato ideals, and it singles out the class of log (very-) generic hypersurfaces as an interesting class of singularities on its own.
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Acknowledgements
We thank M. Mustaţă, L. Wu, P. Zhao, and the referee for useful comments. We are especially grateful to the referee for formulating Theorem 1.10. The first author would like to thank MPI Bonn for hospitality during the writing of this article. The first author was partly supported by the grants STRT/13/005 and Methusalem METH/15/026 from KU Leuven, G097819N and G0F4216N from FWO (Research Foundation - Flanders). The second author is supported by a PhD Fellowship from FWO.
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Budur, N., van der Veer, R. Monodromy conjecture for log generic polynomials. Math. Z. 301, 713–737 (2022). https://doi.org/10.1007/s00209-021-02914-4
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DOI: https://doi.org/10.1007/s00209-021-02914-4