Abstract
Black holes of almost arbitrarily small mass may have formed in the very early Universe. Their presence today would be revealed by the energetic radiation they would produce by means of the quantum-gravitational Hawking mechanism, allowing observational limits to be set on their density today and on their past significance.
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Halzen, F., Zas, E., MacGibbon, J. et al. Gamma rays and energetic particles from primordial black holes. Nature 353, 807–815 (1991). https://doi.org/10.1038/353807a0
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DOI: https://doi.org/10.1038/353807a0
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