New method for shadow calculations: Application to parametrized axisymmetric black holes

By Z. Younsi, A. Zhidenko, Luciano Rezzolla, R. Konoplya, Yosuke Mizuno. 2016

223 citations recorded by the source corpus.

Collaborative international efforts under the name of the Event Horizon Telescope project, using sub-mm very long baseline interferometry, are soon expected to provide the first images of the shadow cast by the candidate supermassive black hole in our Galactic center, Sagittarius A*. Observations of this shadow would provide direct evidence of the existence of astrophysical black holes. Although it is expected that astrophysical black holes are described by the axisymmetric Kerr solution, there also exist many other black hole solutions, both in general relativity and in other theories of gravity, which cannot presently be ruled out. To this end, we present calculations of black hole shadow images from various metric theories of gravity as described by our recent work on a general parametrization of axisymmetric black holes [R. Konoplya, L. Rezzolla, and A. Zhidenko, Phys. Rev. D 93, 064015 (2016).]. An algorithm to perform general ray-tracing calculations for any metric theory of gravity is first outlined and then employed to demonstrate that even for extremal metric deformation parameters of various black hole spacetimes, this parametrization is both robust and rapidly convergent to the correct solution.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/2eb62e3a5b6d4613ff79353565a00bf4a2a475a7

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Citations in the corpus

Shadows and deflection angle of charged and slowly rotating black holes in Einstein-Æther theory (2019, unknown): “[9] Z.”
Gravitational Lensing in Presence of Plasma: Strong Lens Systems, Black Hole Lensing and Shadow (2017, background): “Numerous analytical investigations and numerical simulations of the shadow are presented in literature (for example, see [90, 101, 95, 85, 86, 103, 104, 105, 94, 98, 99, 91, 106, 102, 97, 87, 88, 89, 93, 92, 96, 100, 110, 107, 108, 109, 111]).”
Black Hole Parameter Estimation from Its Shadow (2018, background): “…work for black holes in some modified theories of gravity (Abdujabbarov et al. 2015b), which leads to the introduction of new observables (Schee & Stuchlik 2009; Johannsen 2013b; Tsukamoto et al. 2014; Abdujabbarov et al. 2015b; Cunha et al. 2015; Younsi et al. 2016; Tsupko 2017; Wang et al. 2018).”
Phenomenological aspects of black holes beyond general relativity (2018, methodology): “[154] Ziri Younsi, Alexander Zhidenko, Luciano Rezzolla, Roman Konoplya, and Yosuke Mizuno, “New method for shadow calculations: Application to parametrized axisymmetric black holes,” Phys.”