On $p$-adic Asai $L$-functions of Bianchi modular forms at non-ordinary primes and their decomposition into bounded $p$-adic $L$-functions (2501.10581v1)

Abstract: Let $p$ be an odd prime integer, $F/\mathbb{Q}$ be an imaginary quadratic field, and $\Psi$ be a small slope cuspidal Bianchi modular form over $F$ which is non-ordinary at $p$. In this article, we first construct a $p$-adic distribution $L^{\mathrm{As}}_{p}(\Psi)$ that interpolates the twisted critical $L$-values of Asai (or twisted tensor) $L$-function of $\Psi$, generalizing the works of Loeffler-Williams from the ordinary case to the non-ordinary case. To construct this distribution, we use the Betti analogue of the Euler system machinery, developed by Loeffler-Williams, as well as techniques analogous to those used by Loeffler-Zerbes for interpolating the twists of Beilinson-Flach elements arising in the Euler system associated with Rankin-Selberg convolutions of elliptic modular forms. We also use the interpolation method developed by Amice-V\'elu, Perrin-Riou, and B\"uy\"ukboduk-Lei in the construction. Furthermore, assume that $p$ splits as $\mathfrak{p}\overline{\mathfrak{p}}$ in $F$. Let $\Psi$ be a cuspidal Bianchi eigenform of level $\mathcal{N}$, where $\mathcal{N}\subset\mathcal{O}{F}$ is an ideal coprime to $p$, such that $\Psi$ is non-ordinary at $\mathfrak{p}$ and ordinary at $\overline{\mathfrak{p}}$. We can then attach unbounded $p$-adic distributions $L{p}^{\mathrm{As}}(\Psi^{\tilde{\alpha}})$ and $L_{p}^{\mathrm{As}}(\Psi^{\tilde{\beta}})$ to the $p$-stabilizations $\Psi^{\tilde{\alpha}}$ and $\Psi^{\tilde{\beta}}$ of $\Psi$ respectively. Another objective of this article is to decompose these unbounded $p$-adic distributions into the linear combination of bounded measures as done by Pollack, Sprung, and Lei-Loeffler-Zerbes in the elliptic modular forms case.