  We show for the first time that sustained turbulence is possible at low
magnetic Prandtl number for Keplerian flows with no mean magnetic flux. Our
results indicate that increasing the vertical domain size is equivalent to
increasing the dynamical range between the energy injection scale and the
dissipative scale. This has important implications for a large variety of
differentially rotating systems with low magnetic Prandtl number such as
protostellar disks and laboratory experiments.
