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Journal Article

Boosted Schwarzschild Metrics from a Kerr-Schild Perspective


Winicour,  Jeffrey
AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Mädler, T., & Winicour, J. (2018). Boosted Schwarzschild Metrics from a Kerr-Schild Perspective. Classical and Quantum Gravity, 35(3): 035009. doi:10.1088/1361-6382/aaa18e.

Cite as: http://hdl.handle.net/21.11116/0000-0000-64BF-9
The Kerr-Schild version of the Schwarzschild metric contains a Minkowski background which provides a definition of a boosted black hole. There are two Kerr-Schild versions corresponding to ingoing or outgoing principle null directions. We show that the two corresponding Minkowski backgrounds and their associated boosts have an unexpected difference. We analyze this difference and discuss the implications in the nonlinear regime for the gravitational memory effect resulting from the ejection of massive particles from an isolated system. We show that the nonlinear effect agrees with the linearized result based upon the retarded Green function only if the velocity of the ejected particle corresponds to a boost symmetry of the ingoing Minkowski background. A boost with respect to the outgoing Minkowski background is inconsistent with the absence of ingoing radiation from past null infinity.