Braneworld effects cause primordial black holes to accrete matter far more efficiently in the early universe, producing present-day masses up to 10^5 times larger than previous estimates for the smallest allowed fundamental Planck scale.
How particle collisions increase the rate of accretion from the cosmological background onto primordial black holes in braneworld cosmology
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abstract
It is shown that, contrary to the widespread opinion, particle collisions considerably increase accretion rate from the cosmological background onto 5D primordial black holes formed during the high-energy phase of the Randall-Sundrum Type II braneworld scenario. Increase of accretion rate leads to much tighter constraints on initial primordial black hole mass fraction imposed by the critical density limit and measurements of high-energy diffuse photon background and antiproton excess.
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Cosmological accretion onto braneworld black holes: a relativistic treatment
Braneworld effects cause primordial black holes to accrete matter far more efficiently in the early universe, producing present-day masses up to 10^5 times larger than previous estimates for the smallest allowed fundamental Planck scale.