Shadow of a disformal Kerr black hole in quadratic DHOST theories
arXiv:2009.07508
Abstract
We have studied the shadow of a disformal Kerr black hole with an extra deformation parameter, which belongs to non-stealth rotating solutions in quadratic Degenerate Higher Order Scalar Tensor (DHOST) theory. Our result show that the size of the shadow increases with the deformation parameter for the black hole with arbitrary spin parameter. However, the effect of the deformation parameter on the shadow shape depends heavily on the spin parameter of black hole and the sign of the deformation parameter. The change of the shadow shape becomes more distinct for the black hole with the more quickly rotation and the more negative deformation parameter. Especially, for the near-extreme black hole with negative deformation parameter, there exist a "pedicel"-like structure appeared in the shadow, which increases with the absolute value of deformation parameter. The eyebrow-like shadow and the self-similar fractal structures also appear in the shadow for the disformal Kerr black hole in DHOST theory. These features in the black hole shadow originating from the scalar field could help us to understand the non-stealth disformal Kerr black hole and quadratic DHOST theory.
arXiv comment13 pages, 5 figures
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- Einstein-Æther Gravity in the light of Event Horizon Telescope Observations of M87*
- Constraints on Barrow entropy from M87* and S2 star observations
- Kerr Black hole shadows in Melvin magnetic field with stable photon orbits
- Effect of noncircularity on the dynamic behaviors of particles in a disformal rotating black-hole spacetime