A Bloch–Kato-type formula for critical Asai motives

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=HomO(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

ordp(LΣ+(1,π,r±Ψ)Ω)=ordp(#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.

Sources & referencesView supporting material

Primary source

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

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