  It is by now well known that various condensed matter systems may be used to
mimic many of the kinematic aspects of general relativity, and in particular of
curved-spacetime quantum field theory. In this essay we will take a look at
what would be needed to mimic a cosmological spacetime -- to be precise a
spatially flat FRW cosmology -- in one of these analogue models. In order to do
this one needs to build and control suitable time dependent systems. We discuss
here two quite different ways to achieve this goal. One might rely on an
explosion, physically mimicking the big bang by an outflow of whatever medium
is being used to carry the excitations of the analogue model, but this idea
appears to encounter dynamical problems in practice. More subtly, one can avoid
the need for any actual physical motion (and avoid the dynamical problems) by
instead adjusting the propagation speed of the excitations of the analogue
model. We shall focus on this more promising route and discuss its
practicality.
