2010/02/28 by Bibekananda Nayak, B. Nayak, A. S. Majumdar +1
Physics and Astronomy · #Astronomy #Astrophysics #Binary black hole #Black Holes and Theoretical Physics #Brans–Dicke theory #Cosmological model #Cosmological perturbation theory #Cosmology #Cosmology and Gravitation Theories #Gravitational wave #Physics #Primordial black hole #Quantum electrodynamics #Relativity and Gravitational Theory #Theoretical physics #Universe #astro-ph.CO #gr-qc
paper · pdf · doi:10.1088/1475-7516/2010/08/039
published as JCAP 1008:039,2010 · 15 pages
openalex publication_date 2010/08/31 · arxiv created 2010/09/03 · arxiv updated 2012/01/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We consider cosmological evolution in Brans-Dicke theory with a population of primordial black holes. Hawking radiation from the primordial black holes impacts various astrophysical processes during the evolution of the Universe. The accretion of radiation by the black holes in the radiation dominated era may 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 arising from the present density of the Universe, the present photon spectrum, 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 primordial black hole mass fractions are tightened with increased accretion efficiency.