Not quite black holes at LIGO

Abstract

We provide more evidence of not quite black holes at LIGO. We update and streamline our previous search strategy and apply it to the ten black hole merger events and the one neutron star merger event. The strategy is aimed at the evenly spaced resonance spectrum expected from not quite black holes, given that at low frequencies the radial wave equation describes the modes of a stretched 1D cavity. We describe various indications of the self-consistency of the apparent signals across all events in the context of a simple theoretical model. The merger with the largest final mass, spin and redshift, GW170729, provides additional interesting support.