Cloud fragmentation cascades and feedback: on reconciling an unfettered
  inertial range with a low star formation rate
  Molecular cloud complexes exhibit both (i) an unfettered Larson-type spectrum
over much of their dynamic range, whilst (ii) still producing a much lower
star-formation rate than were this cascade to remain unfettered all the way
down to star-forming scales. Here we explain the compatibility of these
attributes with minimalist considerations of a mass-conserving fragmentation
cascade, combined with estimates of stellar feedback. Of importance is that the
amount of feedback needed to abate fragmentation and truncate the complex
decreases with decreasing scale. The scale at which the feedback momentum
matches the free-fall momentum marks a transition scale below most of the
cascade is truncated and the molecular cloud complex dissipated. For a
$10^6M_\odot$ GMC complex starting with radius of $\sim 50$pc, the combined
feedback from young stellar objects, supernovae, radiation, and stellar winds
for a GMC cloud complex can truncate the cascade within an outer free-fall time
but only after the cascade reaches parsec scales.
