Abstract
We consider cosmological evolution in Brans-Dicke theory with a populationof primordial black holes. Hawking radiation from the primordial black holesimpacts various astrophysical processes during the evolution of the Universe.The accretion of radiation by the black holes in the radiation dominated eramay be effective in imparting them a longer lifetime. We present a detailed study of how this affects various standard astrophysical constraints coming from the evaporation of primordial black holes. We analyze constraints arisingfrom the present density of the Universe, the present photonspectrum, the distortion of the cosmic microwave background spectrum and also from processes affecting light element abundances after nucleosynthesis. We find that the constraints on the initial primordialblack hole mass fractions are tightened with increased accretion efficiency.
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