Two previously found k-essence black hole/wormhole solutions are shown to be unstable under radial perturbations, and a generic instability is argued for power-law k-essence with exponent n < 1/2.
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On the instability of some k-essence space-times
Two previously found k-essence black hole/wormhole solutions are shown to be unstable under radial perturbations, and a generic instability is argued for power-law k-essence with exponent n < 1/2.