> 2/3 LIGO detections imply one of the merging pair of black holes should be a naked singularity.
Where did you get this impression? All of the LIGO results are consistent with "standard" GR black holes whose event horizons merge.
Where did you get this impression? All of the LIGO results are consistent with "standard" GR black holes whose event horizons merge.
Background: https://en.wikipedia.org/wiki/Gravastar
This creates more interest, but can obfuscate what the real situation in the field is. In this case, while Gravastars are certainly something many scientists actively do and should consider, there is no real evidence from the LIGO data that favors the hypothesis of "we are in a universe that lacks causality" over the observation of the merger of two Kerr black holes.
Yes.
http://journals.aps.org/prd/abstract/10.1103/PhysRevD.94.084... (preprint: https://arxiv.org/abs/1602.08759)
So you're still left with gravastar models that can co-exist with black holes.