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Hidden Momentum and Black Hole Kicks

A stationary magnetic dipole immersed in an electric field carries "hidden" mechanical momentum. However, the fate of this momentum if the fields are turned off is unclear. We consider a charge-and-dipole hidden momentum configuration, and turn off the fields by collapsing a null shell onto the system, forming a black hole. In numerical calculations we find that the black hole receives a kick corresponding to 0.1% of the initial stored momentum. When extrapolated to apply to purely gravitational phenomena, this efficiency suggests a role for the hidden momentum kick mechanism in generating the binary black hole "superkicks" observed in numerical simulations of Einstein's equation.

preprint2013arXivOpen access
Samuel E. GrallaFrank Herrmann
gr-qcphysics.class-ph
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Samuel E. GrallaFrank Herrmann

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