  A new experiment has been performed to study the formation of topological
defects (quantized vortices) during rapid quenches of liquid 4He through the
superfluid transition, with particular care taken to minimise vortex creation
via conventional hydrodynamic flow processes. It is found that the generated
vortices, if any, are being produced at densities at least two orders of
magnitude less than might be expected on the basis of the Kibble-Zurek
mechanism.
