Are Superluminous Supernovae Powered By Collision Or By Millisecond
  Magnetars?
  Using our previously derived simple analytic expression for the bolometric
light curves of supernovae, we demonstrate that the collision of the fast
debris of ordinary supernova explosions with relatively slow-moving shells from
pre-supernova eruptions can produce the observed bolometric light curves of
superluminous supernovae (SLSNe) of all types. These include both, those which
can be explained as powered by spinning-down millisecond magnetars and those
which cannot. That and the observed close similarity between the bolometric
light-curves of SLSNe and ordinary interacting SNe suggest that SLSNe are
powered mainly by collisions with relatively slow moving circumstellar shells
from pre-supernova eruptions rather than by the spin-down of millisecond
magnetars born in core collapse supernova explosions.
