Local Motivic Monodromy Conjecture for formal schemes

Assume that kk has characteristic zero and that RR is complete. Let X\mathfrak{X} be a regular stftstft formal RR-scheme, with special fiber Xs\mathfrak{X}_s, motivic Weil generating series S(X;T)S(\mathfrak{X};T), nearby-cycle functor ψX\psi_{\mathfrak{X}}, monodromy operator σ\sigma, and cyclotomic polynomial Φn(t)\Phi_n(t). Let τ(a/b)\tau(a/b) denote the order of the root of unity Exp(2πia/b){\mathcal{E}\mathrm{xp}}(2\pi i a/b).

Local Motivic Monodromy Conjecture. There exists a finite subset SZ×Z>0\mathcal{S}\subset\mathbb{Z}\times\mathbb{Z}_{>0} such that

S(X;T)MXs[T,11LaTb](a,b)SS(\mathfrak{X};T)\in \mathcal{M}_{\mathfrak{X}_s}\left[T,\frac{1}{1-\mathbb{L}^aT^b}\right]_{(a,b)\in\mathcal{S}}

and, for each (a,b)S(a,b)\in\mathcal{S}, the cyclotomic polynomial Φτ(a/b)(t)\Phi_{\tau(a/b)}(t) divides the characteristic polynomial of σ\sigma on RiψX(Q)xR^i\psi_{\mathfrak{X}}(\mathbb{Q}_\ell)_x for some iZ0i\in\mathbb{Z}_{\geq0} and some geometric closed point xx of Xs\mathfrak{X}_s.

The conjecture predicts that every denominator contributing to the motivic Weil generating series is detected by monodromy on nearby-cycle cohomology. The supplied text does not state a resolution.

Sources & referencesView supporting material

Primary source

Lars Halvard Halle and Johannes Nicaise, “Motivic zeta functions of abelian varieties, and the monodromy conjecture”, arXiv:0902.3755 (2009).

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