Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2007-09-20
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
5 pages, Latex; uses MNRAS stylefiles; minor changes; accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2008.12925.x
We consider the evolution of primordial black holes in a generalyzed Jordan-Brans-Dicke cosmological model where both the Brans-Dicke scalar field and its coupling to gravity are dynamical functions determined from the evolution equations. The evaporation rate for the black holes changes compared to that in standard cosmology. We show that accretion of radiation can proceed effectively in the radiation dominated era. The black hole lifetime shortens for low initial mass, but increases for high initial mass, and is thus considerably modified compared to the case of standard cosmology. We derive a cut-off value for the initial black hole mass, below which primordial black holes evaporate out in the radiation dominated era, and above which they survive beyond the present era.
Gangopadhyay Debajyoti
Majumdar Archan S.
Singh Lambodar Prasad
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