Unveiling the singular dynamics in the cosmic large-scale structure
  It is known that the gravitational collapse of cold dark matter leads to
infinite-density caustics that seed the primordial dark-matter halos in the
large-scale structure. The development of these caustics begins, generically,
as an almost one-dimensional phenomenon with the formation of pancakes.
Focusing on the one-dimensional case, we identify a landscape of
non-differentiable, and thus, singular features in the particle acceleration
that emerge after the first crossing of particle trajectories. We complement
our fully analytical studies by high-resolution simulations and find
outstanding agreement, particularly shortly after the first crossing. We
develop the methods in one space dimension but outline briefly the necessary
steps for the 3D case.
