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We show that the effect of initial non-Gaussian clustering can significantlyenhance the event rate for primordial black hole (PBH) coalescence. The impactof such clustering is studied in a specific scenario of multi-stream inflation.Initial clustering enables the possibility of detecting massive PBH coalescenceby space-based gravitational wave interferometers such as LISA and DECIGO/BBO.The parameter regime for the ground-based detectors to detect PBH coalescenceis also extended.

Detectability of Gravitational Waves from the Coalescence of Massive Primordial Black Holes with Initial Clustering