Determinantal structures for Bessel fields

Abstract: A Bessel field $\mathcal{B}={\mathcal{B}(\alpha,t), \alpha\in\mathbb{N}_0, t\in\mathbb{R}}$ is a two-variable random field such that for every $(\alpha,t)$, $\mathcal{B}(\alpha,t)$ has the law of a Bessel point process with index $\alpha$. The Bessel fields arise as hard edge scaling limits of the Laguerre field, a natural extension of the classical Laguerre unitary ensemble. It is recently proved in [LW21] that for fixed $\alpha$, ${\mathcal{B}(\alpha,t), t\in\mathbb{R}}$ is a squared Bessel Gibbsian line ensemble. In this paper, we discover rich integrable structures for the Bessel fields: along a time-like or a space-like path, $\mathcal{B}$ is a determinantal point process with an explicit correlation kernel; for fixed $t$, ${\mathcal{B}(\alpha,t),\alpha\in\mathbb{N}_0}$ is an exponential Gibbsian line ensemble.