Imagine I were to shake a black hole rigorously, does it grow bigger? I think it will simply radiate all the kinetic energy gained from the shaking as gravitational wave right? In the normal case, if I shake a planet, its mass remains unchanged but gains kinetic energy then in the case of a black hole, its mass should remain intact but the missing energy must go somewhere. I bet it is lost as gravitational wave but need someone to confirm.

  • $\begingroup$ By shaking a black hole do you mean just giving it (kinetic?) energy, or something else too? $\endgroup$ – Eagle Mar 30 at 14:56
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    $\begingroup$ How are you going to shake a black hole? There are several possible ways and the answer depends on the details. $\endgroup$ – A.V.S. Mar 30 at 15:03
  • $\begingroup$ the LIGO observation showed one black hole shaking another, before merging, and yes there are gravitational waves that were detected.en.wikipedia.org/wiki/LIGO $\endgroup$ – anna v Mar 30 at 16:44

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