Formation of the First Planetesimals via the Streaming Instability in Globally Turbulent Protoplanetary Disks?

Abstract Using self-consistent models of turbulent particle growth in an evolving protoplanetary nebula solar composition, we find that recently proposed local metallicity and Stokes number criteria necessary for the streaming instability to generate gravitationally bound overdensities are generally not approached anywhere disk during first million years, epoch which meteoritic observational evidence strongly suggests formation planetesimals perhaps giant planet core accretion already occurring.