Rapid Merger of Binary Primordial Black Holes

Details Rapid Merger of Binary Primordial Black Holes Rapid Merger of Binary Primordial Black Holes

2009-09-09

arxiv.org/abs/0909.1738v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5pages,no figure

Scientific paper

We propose a new scenario for the evolution of a binary of primordial black holes (PBHs). We consider the dynamical friction by ambient dark matter and gravitational interaction between a binary and a circumbinary disk, assuming PBHs do not constitute the bulk of dark matter. After the turnaround, a PBH binary loses the energy and angular momentum by the two processes, which are very effective for a typical configuration. Finally the binary coalesces due to the emission of gravitational waves in a time scale much shorter than the age of the universe. We estimate the density parameter of the resultant gravitational wave background. Astrophysical implication concerning supermassive black holes is also discussed.

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