  In this paper, we construct the Bessel line ensemble, a countable collection
of continuous random curves. This line ensemble is stationary under horizontal
shifts with the Bessel point process as its one-time marginal. Its finite
dimensional distributions are given by the extended Bessel kernel. Furthermore,
it enjoys a novel resampling invariance with respect to non-intersecting
squared Bessel bridges. The Bessel line ensemble is constructed by extracting
the hard edge scaling limit of a collection of independent squared Bessel
processes starting at the origin and never being conditioned to intersect. This
process is also known as the Dyson Bessel process, and it arises as the
evolution of the eigenvalues of the Laguerre unitary ensemble with i.i.d.
complex Brownian entries.
