Shadows of Kerr black holes with and without scalar hair

By P. Cunha, Carlos A. R. Herdeiro, Eugen Radu, H. R'unarsson. 2016

155 citations recorded by the source corpus.

For an observer, the Black Hole (BH) shadow is the BH's apparent image in the sky due to the gravitational lensing of nearby radiation, emitted by an external source. A recent class of solutions dubbed Kerr BHs with scalar hair possess smaller shadows than the corresponding Kerr BHs and, under some conditions, novel exotic shadow shapes can arise. Thus, these hairy BHs could potentially provide new shadow templates for future experiments such as the Event Horizon Telescope. In order to obtain the shadows, the backward ray-tracing algorithm is briefly introduced, followed by numerical examples of shadows of Kerr BHs with scalar hair contrasting with the Kerr analogues. Additionally, an analytical solution for the Kerr shadow is derived in closed form for a ZAMO observer at an arbitrary position.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/db808230c5a178af18cc6e8282b30cfeba750915

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. Paolo Pani
2. R. Brito
3. V. Cardoso
4. Carlos A. R. Herdeiro
5. P. Cunha
6. Eugen Radu
7. H. R'unarsson
8. Jiliang Jing

In Nuclear and High Energy Physics

1. R. Brito
2. Paolo Pani
3. V. Cardoso
4. P. Cunha
5. Carlos A. R. Herdeiro
6. Eugen Radu
7. H. R'unarsson
8. Jiliang Jing

Citations in the corpus

• The imitation game: Proca stars that can mimic the Schwarzschild shadow (2021, unknown): “[31,81–84], to numerically integrate the null geodesic equations ẍ + Γαβ ẋ ẋ = 0.”
• Shadow casted by a Konoplya-Zhidenko rotating non-Kerr black hole (2017, background): “Generally, it is convenient to choice a decomposition connected to a reference frame with zero axial angular momentum in relation to spatial infinity, which is given by [2, 20, 27, 41, 42]”
• Superradiance (2015, background): “[662, 663, 664].”
• Chaotic lensing around boson stars and Kerr black holes with scalar hair (2016, background): “ngle in the e 1 e 2 plane, measured with respect to e 1. Given a light ray incident on the camera, it is straightforward to relate its momentum, at the camera position, to these spherical coordinates [50]. To obtain an image, a scan over observation angles is performed, tracing the corresponding lig”