A Bloch–Kato-type formula for critical Asai motives

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Let M=M(π,r±⊗Ψ)\mathcal{M}=\mathcal{M}(\pi,r^{\pm}\otimes\Psi) be critical, with Betti and de Rham realizations HB(M)H_{\rm B}(\mathcal{M}) and HdR(M)H_{\rm dR}(\mathcal{M}), and let TpT_{\mathfrak p} be the chosen GK+G_{K^+}-invariant lattice in its p\mathfrak p-adic realization. Let Ω\Omega be the corresponding Deligne period. For a finite set of primes Σ+\Sigma^+ containing every vv at which πv\pi_v or K/K+K/K^+ is ramified, but not containing pp, write Tp∗=Hom⁡O(Tp,O)T^*_{\mathfrak p}=\operatorname{Hom}_{\mathcal O}(T_{\mathfrak p},\mathcal O) with the dual GK+G_{K^+}-action. Conjecture 4.1. One has

ord⁡p(LΣ+(1,π,r±⊗Ψ)Ω)=ord⁡p(#HΣ+1(K+,Tp∗⊗(E/O))#H0(K+,Tp∗⊗(E/O))),\operatorname{ord}_{\mathfrak p}\left(\frac{L^{\Sigma^+}(1,\pi,r^{\pm}\otimes\Psi)}{\Omega}\right)=\operatorname{ord}_{\mathfrak p}\left(\frac{\#H^1_{\Sigma^+}(K^+,T^*_{\mathfrak p}\otimes(E/\mathcal O))}{\#H^0(K^+,T^*_{\mathfrak p}\otimes(E/\mathcal O))}\right),

where #\# denotes a Fitting ideal. This is the expected relation between the algebraic part of a critical Asai LL-value and the corresponding Selmer group, in the spirit of the Bloch–Kato conjecture. The source does not provide evidence resolving this formulation.

References

Primary source

Tobias Berger, “Oddness of residually reducible Galois representations”, arXiv:1611.09315 (2016).

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