Arithmetic properties and zeros of the Bergman kernel on a class of quotient domains

Abstract: An effective formula for the Bergman kernel on $\mathbb{H}{\gamma} = {|z_1|^\gamma < |z_2| < 1 }$ is obtained for rational $\gamma = \frac{m}{n} >1$. The formula depends on arithmetic properties of $\gamma$, which uncovers new symmetries and clarifies previous results. The formulas are then used to study the Lu Qi-Keng problem. We produce sequences of rationals $\gamma_j \searrow 1$, where each $\mathbb{H}{\gamma_j}$ has a Bergman kernel with zeros (while $\mathbb{H}_1$ is known to have a zero-free kernel), resolving an open question on this domain class.