Published online by Cambridge University Press: 20 November 2018
The behavior of the dynamical zeta function ${{Z}_{D}}(s)$ related to several strictly convex disjoint obstacles is similar to that of the inverse
$Q(s)\,=\,\frac{1}{\zeta (s)}$ of the Riemann zeta function
$\zeta \left( s \right)$ . Let
$\prod \left( s \right)$ be the series obtained from
${{Z}_{D}}(s)$ summing only over primitive periodic rays. In this paper we examine the analytic singularities of
${{Z}_{D}}(s)$ and
$\prod \left( s \right)$ close to the line
$\Re s={{s}_{2}},$ where
${{s}_{2}}$ is the abscissa of absolute convergence of the series obtained by the second iterations of the primitive periodic rays. We show that at least one of the functions
${{Z}_{D}}(s),$
$\prod \left( s \right)$ has a singularity at
$s\,=\,{{s}_{2}}$ .