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Signed $p$-adic $L$-functions of Bianchi modular forms (2401.15881v3)

Published 29 Jan 2024 in math.NT

Abstract: Let $p\geq 3$ be a prime number and $K$ be a quadratic imaginary field in which $p$ splits as $\mathfrak{p}\overline{\mathfrak{p}}$. Let $\mathcal{F}$ be a cuspidal Bianchi eigenform over $K$ of weight $(k,k)$, where $k\geq 0$ is an integer, level $\mathfrak{m}$ coprime to $p$, and non-ordinary at both of the primes above $p$. We assume $\mathcal{F}$ has trivial nebentypus. For $\mathfrak{q}\in{\mathfrak{p}, \overline{\mathfrak{p}}}$, let $a_{\mathfrak{q}}$ be the $T_{\mathfrak{q}}$ Hecke eigenvalue of $\mathcal{F}$ and let $\alpha_{\mathfrak{q}},\beta_{\mathfrak{q}}$ be the roots of polynomial $X{2} -a_{\mathfrak{q}}X+ p{k+1}$. Then we have four $p$-stabilizations of $\mathcal{F}$: $\mathcal{F}{\alpha_{\mathfrak{p}},\alpha_{\overline{\mathfrak{p}}}}, \mathcal{F}{\alpha_{\mathfrak{p}},\beta_{\overline{\mathfrak{p}}}}, \mathcal{F}{\beta_{\mathfrak{p}},\alpha_{\overline{\mathfrak{p}}}},$ and $ \mathcal{F}{\beta_{\mathfrak{p}},\beta_{\overline{\mathfrak{p}}}}$ which are Bianchi cuspforms of level $p\mathfrak{m}$. Due to Williams, to each $p$-stabilization $\mathcal{F}{*,\dagger}$, we can attach a locally analytic distribution $L_{p}(\mathcal{F}{*,\dagger})$ over the ray class group $\text{Cl}(K,p{\infty})$. On viewing $L_{p}(\mathcal{F}{*,\dagger})$ as a two-variable power series with coefficients in some $p$-adic field having unbounded denominators satisfying certain growth conditions, we decompose this power series into a linear combination of power series with bounded coefficients in the spirit of Pollack, Sprung, and Lei--Loeffler--Zerbes.

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