• Corpus ID: 239885476

Evaporating primordial black holes, the string axiverse, and hot dark radiation

  title={Evaporating primordial black holes, the string axiverse, and hot dark radiation},
  author={Marco Calz{\'a} and John March-Russell and Jo{\~a}o G. Rosa},
We show that primordial black holes (PBHs) develop non-negligible spins through Hawking emission of the large number of axion-like particles generically present in string theory compactifications. This is because scalars can be emitted in the monopole mode (l = 0), where no angular momentum is removed from the BH, so a sufficiently large number of scalars can compensate for the spin-down produced by fermion, gauge boson, and graviton emission. The resulting characteristic spin distributions for… 

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