Recent Advanced LIGO detections of binary black hole mergers have prompted multiple studies investigating the possibility that the heavy GW150914 binary system was of primordial origin, and hence could be evidence for dark matter in the form of black holes. We compute the stochastic background arising from the incoherent superposition of such primordial binary black hole systems in the Universe and compare it to the similar background spectrum due to binary black hole systems of stellar origin. We investigate the possibility of detecting this background with future gravitational-wave detectors, and conclude that constraining the dark matter component in the form of black holes using stochastic gravitational-wave background measurements will be very challenging.
Bibliographical noteFunding Information:
We would like to thank Marc Kamionkowski and Eric Thrane for valuable discussions. The work of V.M. was supported in part by the NSF Grant No. PHY-1204944 at the University of Minnesota. S.B. was supported by NASA through Einstein Postdoctoral Fellowship Grant No. PF5-160133. I.C. was supported by NASA NNX15AB18G Grand and the Simons Foundation. LIGO Document Control No. LIGO-P1600241.
© 2016 American Physical Society.