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Shadow of axisymmetric, stationary and asymptotically flat black holes in the presence of plasma
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We study the shadow produced by a class of rotating black holes surrounded by plasma. The metric for these black holes arises by applying the Newman-Janis algorithm to a family of spherically symmetric spacetimes, which includes several well known geometries as special cases. We derive a general expression for the shape of the shadow in the case that the plasma frequency leads to a separable Hamilton-Jacobi equation for light. We present two examples in which we obtain the shadow contours and the observables resulting from them. In one, we analyze Kerr-Newman-like geometries, including braneworld and Horndeski gravity black holes, while in the other, we consider scalar-tensor 4D Einstein-Gauss-Bonnet gravity spacetimes. In both cases, we find that the presence of plasma leads to a smaller and less deformed shadow.
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Cited by 2 Pith papers
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Shadow constraints of charged black hole with scalar hair and gravitational waves from extreme mass ratio inspirals
EHT shadow data constrain the EMCS black hole charge and scalar hair to about 0.1 and 0.01 levels, while LISA EMRI waveforms could reach 0.01 and 0.0001 levels.
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Plasma effects on gravitational lensing and shadow observables of a Kerr-like black hole in a dark matter halo
Homogeneous plasma enlarges Kerr-like black-hole shadows and emission rates while inhomogeneous plasma shrinks them; astrophysical dark-matter densities leave photon orbits essentially unchanged.
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