Strong lensing by DHOST black holes
arXiv:2007.09473 · doi:10.1088/1361-6382/abdd0d
Abstract
The deflection of light in the strong field limit is an important test for alternative theories of gravity. However, solutions for the metric that allow for analytic computations are not always available. We implement a hybrid analytic-numerical approximation to determine the deflection angle in static, spherically symmetrics pacetimes. We apply this to a set of numerical black hole solutions within the class of theories known as Degenerate Higher Order Scalar-tensor Theories. Comparing our results to a more time consuming full numerical integration, we find that we can accurately describe the deflection angle for light rays passing at arbitrary distances from the photon sphere with a combination of two analytic-numerical approximations. Furthermore, we find a range of parameters where our DHOST black holes predict strong lensing effects whose size is comparable with the uncertainty in the properties of the supermassive black hole in M87 reported by the Event Horizon Telescope, showing that strong lensing is a viable alternative to put constraints on these models.
22 pages, 8 figures
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- Gravitational lensing by a black hole in effective loop quantum gravity
- Conservation of distortion of gravitationally lensed images
- Geodesics motion of test particles around Schwarzschild-Klinkhamer wormhole with topological defects and gravitational lensing
- Horndeski fermion-boson stars
- Total light bending in non-asymptotically flat black hole spacetimes
- Strong Gravitational Lensing in Horndeski theory
- Gravitational lensing by charged black hole with global monopole in the strong field limit
- Constraining a disformal Schwarzschild black hole in DHOST theories with the orbit of the S2 star
- Analyzing the effect of higher dimensions on the black hole silhouette, deflection angles, and PINN approximated quasinormal modes