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Optical phenomena in brany Kerr spacetimes
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We study the influence of the tidal charge parameter of the braneworld models onto some optical phenomena in rotating black hole spacetimes. The escape photon cones are determined for special families of locally non-rotating, circular geodetical and radially free falling observers. The silhouette of a rotating black hole, the shape of an equatorial thin accretion disk and time delay effect for direct and indirect images of a radiation hot spot orbiting the black hole are given and classified in terms of the black hole rotational and tidal parameters. It is shown that rising of negatively-valued tidal parameter, with rotational parameter fixed, generally strenghtens the relativistic effects and suppresses the rotation induced asymmetries in the optical phenomena.
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Cited by 2 Pith papers
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Dark matter environments and safeguards for spacetime inference from horizon scale interferometry
Using public 2017 M87* closure data, a frozen Kerr source fails an absolute adequacy test and the differential tidal-charge response fails numerical convergence, so no posterior or bound is reported.
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Relativistic reflection spectra of super-spinning black holes
Fitting Suzaku reflection spectra with a super-spinning spacetime model finds apparent deviations from Kerr in Ark 120 and Swift J0501.9, but the 3-sigma claim is not consistently supported for Swift.
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