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Globular clusters (GCs) display anomalous light element abundances(HeCNONaMgAl), resembling the yields of hot-hydrogen burning, but there is noconsensus yet on the origin of these ubiquitous multiple populations. Wepresent a model in which a super-massive star (SMS, >10^3 Msun) forms viastellar collisions during GC formation and pollutes the intra-cluster medium.The growth of the SMS finds a balance with the wind mass loss rate, such thatthe SMS can produce a significant fraction of the total GC mass in processedmaterial, thereby overcoming the so-called mass-budget problem that plaguesother models. Because of continuous rejuvenation, the SMS acts as a`conveyer-belt' of hot-hydrogen burning yields with (relatively) low Heabundances, in agreement with empirical constraints. Additionally, the amountof processed material per unit of GC mass correlates with GC mass, addressingthe specific mass budget problem. We discuss uncertainties and tests of thisnew self-enrichment scenario.

Supermassive stars as the origin of the multiple populations in globular clusters