  We use the Magneticum suite of state-of-the-art hydrodynamical simulations to
identify cosmic voids based on the watershed technique and investigate their
most fundamental properties across different resolutions in mass and scale.
This encompasses the distributions of void sizes, shapes, and content, as well
as their radial density and velocity profiles traced by the distribution of
cold dark matter particles and halos. We also study the impact of various
tracer properties, such as their sparsity and mass, and the influence of void
merging on these summary statistics. Our results reveal that all of the
analyzed void properties are physically related to each other and describe
universal characteristics that are largely independent of tracer type and
resolution. Most notably, we find that the motion of tracers around void
centers is perfectly consistent with linear dynamics, both for individual, as
well as stacked voids. Despite the large range of scales accessible in our
simulations, we are unable to identify the occurrence of nonlinear dynamics
even inside voids of only a few Mpc in size. This suggests voids to be among
the most pristine probes of cosmology down to scales that are commonly referred
to as highly nonlinear in the field of large-scale structure.
