Gravitational Waves from Coalescing Black Hole MACHO Binaries

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Abstract
If MACHOs are black holes of mass ~0.5 M☉, they must have been formed in the early universe when the temperature was ~1 GeV. We estimate that in this case in our Galaxy's halo out to ~ 50 kpc there exist ~5×108 black hole binaries the coalescence times of which are comparable to the age of the universe, so that the coalescence rate will be ~5×10−2 events yr-1 per galaxy. This suggests that we can expect a few events per year within 15 Mpc. The gravitational waves from such coalescing black hole MACHOs can be detected by the first generation of interferometers in the LIGO/VIRGO/TAMA/GEO network. Therefore, the existence of black hole MACHOs can be tested within the next 5 yr by gravitational waves.
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