Regulated extensions independence-of-ell conjecture for A-motives

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Let FF be a finite extension of the fraction field of AA, let p\mathfrak p be a finite place of FF, and let M‾\underline M be an AA-motive over FpF_{\mathfrak p}. For a maximal ideal ℓ\ell of AA distinct from the maximal ideal below p\mathfrak p, let Ext⁡good1,reg(1,M‾)ℓ\operatorname{Ext}^{1,\mathrm{reg}}_{\mathrm{good}}(\mathbb{1},\underline M)_\ell denote the regulated extensions having good reduction in the ℓ\ell-adic realization.

Regulated independence-of-ℓ\ell conjecture. The inclusion

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

is an equality. In particular, Ext⁡good1,reg(1,N‾)ℓ\operatorname{Ext}^{1,\mathrm{reg}}_{\mathrm{good}}(\mathbb{1},\underline N)_\ell does not depend on ℓ\ell.

This is stated as a strong expectation after the inclusion supplied by the source's main theorem; it is a local regulated analogue of the equality between integral and good-reduction extensions.

References

Primary source

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

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