Forming clusters within clusters: How 30 Doradus recollapsed and gave
  birth again
  The 30 Doradus Nebula in the Large Magellanic Cloud (LMC) contains the
massive starburst cluster NGC 2070 with a massive and probably younger stellar
sub clump at its center: R136. It is not clear how such a massive inner cluster
could form several million years after the older stars in NGC 2070, given that
stellar feedback is usually thought to expel gas and inhibit further star
formation. Using the recently developed 1D feedback scheme WARPFIELD to scan a
large range of cloud and cluster properties, we show that an age offset of
several million years between the stellar populations is in fact to be expected
given the interplay between feedback and gravity in a giant molecular cloud
(GMC) with a density $\gtrsim 500$ cm$^{-3}$ due to re-accretion of gas onto
the older stellar population. Neither capture of field stars nor gas retention
inside the cluster have to be invoked in order to explain the observed age
offset in NGC 2070 as well as the structure of the interstellar medium (ISM)
around it.
