Gravitational wave bursts from Primordial Black Hole hyperbolic encounters

Understand

We propose that Gravitational Wave (GW) bursts with millisecond durations can be explained by the GW emission from the hyperbolic encounters of Primordial Black Holes in dense clusters.

• These bursts are single events, with the bulk of the released energy happening during the closest approach, and emitted in frequencies within the AdvLIGO sensitivity range.
• We provide expressions for the shape of the GW emission in terms of the peak frequency and amplitude, and estimate the rates of these events for a variety of mass and velocity configurations.
• We study the regions of parameter space that will allow detection by both AdvLIGO and, in the future, LISA.