Analytic continuation of the multiple Fibonacci zeta functions

Abstract

In this article, we prove the meromorphic continuation of the multiple Fibonacci zeta functions of depth 2: \begin{equation*} \sum_{0<n_{1}<n_{2}}\frac{1}{F_{n_{1}}^{s_{1}}F_{n_{2}}^{s_{2}}}, \end{equation*} where $F_{n}$ is the $n$-th Fibonacci number, $\mathop{\mathrm{Re}} (s_{1}) > 0$ and $\mathop{\mathrm{Re}} (s_{2}) > 0$. We compute a complete list of its poles and their residues. We also prove that multiple Fibonacci zeta values at negative integer arguments are rational.