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The Randall-Sundrum (RS-II) braneworld cosmological model with a fraction ofthe total energy density in primordial black holes is considered. Due to their5-d geometry these black holes undergo modified Hawking evaporation. It isshown that during the high energy regime accretion from the surroundingradiation bath is dominant compared to evaporation. This effect increases themass of the black holes till the onset of matter (or black hole) domination ofthe total energy density. Thus black holes with even very small initial massescould survive till several cosmologically interesting eras.Comment: Latex, 3 pages; talk delivered at PASCOS'03 in TIFR, Mumbai; to be  published in a special issue of 'Pramana

Primordial braneworld black holes: Significant enhancement of lifetimes through accretion