"How Did Supermassive Black Holes Grow So Big?"
http://www.sciencedaily.com/releases/2013/10/131023090952.htmGravitational waves are never found, even there is no encouraging clue. GW possibly does not exist becuase c is not a limit.
It is a comedy to give the 'upper limit' argument of non existing GW in BH (non)observations.
Of course: Absence of evidance is not evidence of absence.
