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We investigate the possibility that multiple populations in globular clustersarise as a natural by-product of massive star-cluster formation. We use 3Dradiative hydrodynamics simulations for the formation of young massive clustersto track their chemical self-enrichment during their first 5 Myr. Theseclusters form embedded within filamentary Giant Molecular Clouds by acombination of gas accretion and rapid merging of protoclusters. Chemicalenrichment is a dynamic process happening as the young cluster assembles, sothat the original (1P) and enriched (2P) subpopulations of stars form almostsimultaneously. Here we test two simple and opposite extremes for the injectionof enriched material into the intracluster gas: we assume either continuousinjection in a way that tracks the star formation rate; or sudden injection bya single instantaneous event. Using helium abundance as a proxy for theenrichment, we find that realistic multiple population features can bereproduced by injecting a total helium mass amounting to a few percent of thecluster's total mass. The differences in individual growth histories can leadto widely differing 1P/2P outcomes. These models suggest that dual or multiplepopulations can emerge rapidly in massive star clusters undergoing the typicalmode of star cluster formation.

On the Origin of Multiple Populations During Massive Star Cluster Formation