Do black hole shadows merge?
arXiv:2003.07519 · doi:10.1103/PhysRevD.102.044011
Abstract
The so-called black hole shadow is not a silhouette of a black hole but an image of a collapsing object or a white hole. Hence it is non-trivial whether black hole shadows merge with each other when black holes coalesce with each other. In this paper, by analyzing the null geodesic generators of the event horizon in Kastor-Traschen spacetime which describes a coalescence of black boles, we see that observers who will never see a merger of black hole shadows exist.
arXiv comment11 pages, 7 figures, published version
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- Shadow formation in gravitational collapse: Redshift and blueshift by spacetime dynamics
- Gravitational lensing inside and outside of a marginally unstable photon sphere in a general, static, spherically symmetric, and asymptotically-flat spacetime in strong deflection limits