Bloch–Kato conjecture for the Asai L-function

Let K/QK/\mathbf{Q} be the quadratic extension, let π\pi be the automorphic representation and let q>2kq>2k be a prime at which neither π\pi nor K/QK/\mathbf{Q} is ramified. Let Tq(1)k(k)(1)T_{\mathfrak{q}}^{(-1)^k}(k)^*(1) denote the dual of the chosen q\mathfrak{q}-adic lattice in the Tate-twisted Asai representation, and let Ω\Omega be the corresponding Deligne period. For a finite set Σ+\Sigma^+ of primes containing every prime pp at which πp\pi_p or K/QK/\mathbf{Q} is ramified, but not qq, write LΣ+(1,π,r(1)k)L^{\Sigma^+}(1,\pi,r^{(-1)^k}) for the imprimitive Asai LL-value and ordq\operatorname{ord}_{\mathfrak{q}} for the q\mathfrak{q}-adic valuation. Bloch–Kato conjecture. One has

ordq(LΣ+(1,π,r(1)k)Ω)=ordq(#HΣ+1(Q,Tq(1)k(k)(1)(Eq/Oq))#H0(Q,Tq(1)k(k)(1)(Eq/Oq))),\operatorname{ord}_{\mathfrak{q}}\left(\frac{L^{\Sigma^+}(1,\pi,r^{(-1)^k})}{\Omega}\right)=\operatorname{ord}_{\mathfrak{q}}\left(\frac{\# H^1_{\Sigma^+}(\mathbf{Q},T_{\mathfrak{q}}^{(-1)^k}(k)^*(1)\otimes(E_{\mathfrak{q}}/\mathcal{O}_{\mathfrak{q}}))}{\# H^0(\mathbf{Q},T_{\mathfrak{q}}^{(-1)^k}(k)^*(1)\otimes(E_{\mathfrak{q}}/\mathcal{O}_{\mathfrak{q}}))}\right),

where Tq=HomOq(Tq,Oq)T_{\mathfrak{q}}^*={\rm Hom}_{\mathcal{O}_{\mathfrak{q}}}(T_{\mathfrak{q}},\mathcal{O}_{\mathfrak{q}}) has the dual GQG_{\mathbf{Q}}-action and #\# denotes a Fitting ideal. This is the predicted relation between the special value of the Asai LL-function and the Selmer-group arithmetic of the associated motive; the source gives no evidence here that the conjecture has been resolved.

Sources & referencesView supporting material

Primary source

Tobias Berger, “On the Bloch-Kato conjecture for the Asai L-function”, arXiv:1507.00684 (2016).

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