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Title: Shadows of Kerr black holes with and without scalar hair
Author: Cunha, Pedro V. P.
Herdeiro, Carlos A. R.
Radu, Eugen
Runarsson, Helgi F.
Keywords: Shadows
Black hole
Gravitational lensing
Issue Date: Aug-2016
Publisher: World Scientific Publishing
Abstract: For an observer, the Black Hole (BH) shadow is the BHs 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.
Peer review: yes
DOI: 10.1142/S0218271816410212
ISSN: 0218-2718
Appears in Collections:CIDMA - Artigos
DFis - Artigos
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