Regulated local good-reduction conjecture for A-motives

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Let AA be the coefficient ring, let FF be a finite extension of its fraction field, let p\mathfrak p be a finite place of FF, and let M‾p\underline M_{\mathfrak p} be an AA-motive over FpF_{\mathfrak p}. Let ℓ\ell be a maximal ideal of AA such that p\mathfrak p does not lie above ℓ\ell. Write Ext⁡Op1,reg(1p,M‾p)\operatorname{Ext}^{1,\mathrm{reg}}_{\mathcal O_{\mathfrak p}}(\mathbb{1}_{\mathfrak p},\underline M_{\mathfrak p}) for regulated extensions in the integral category, and Ext⁡good1,reg(1p,M‾p)ℓ\operatorname{Ext}^{1,\mathrm{reg}}_{\mathrm{good}}(\mathbb{1}_{\mathfrak p},\underline M_{\mathfrak p})_\ell for regulated extensions having good reduction in the ℓ\ell-adic realization.

Regulated local good-reduction conjecture.

Ext⁡Op1,reg(1p,M‾p)=Ext⁡good1,reg(1p,M‾p)ℓ.\operatorname{Ext}^{1,\mathrm{reg}}_{\mathcal O_{\mathfrak p}}(\mathbb{1}_{\mathfrak p},\underline M_{\mathfrak p})=\operatorname{Ext}^{1,\mathrm{reg}}_{\mathrm{good}}(\mathbb{1}_{\mathfrak p},\underline M_{\mathfrak p})_\ell.

In particular, the module on the right does not depend on ℓ\ell.

This is the proposed regulated analogue of the local integral-part conjecture for AA-motives; the source presents it as strongly expected and obtains the corresponding inclusion.

References

Primary source

Quentin Gazda, “On the Integral Part of A-Motivic Cohomology”, arXiv:2201.09304 (2024).

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