Comment on `An extreme critical spacetime: echoing and black-hole perturbations'

Gérard Clément, Sean A Hayward
2001 Classical and quantum gravity  
We show that the black hole perturbations of the Hayward static solution to the massless Einstein-Klein-Gordon equations are actually gauge artifacts resulting from the linearization of a coordinate transformation.
doi:10.1088/0264-9381/18/21/401 fatcat:yzk5vzimtngpzbo6jbjq5jfrke