Cuspy and fractured black hole shadows in a toy model with axisymmetry

Cuspy and fractured black hole shadows in a toy model with axisymmetry (2022)

Authors:
Autor USP: QIAN, WEILIANG - EEL
Unidade: EEL
DOI: 10.1140/epjc/s10052-022-10033-5
Subjects: FÍSICA; BURACOS NEGROS
Agências de fomento:
Language: Inglês
Abstract: Cuspy shadow was first reported for hairy rotating black holes, whose metrics deviate significantly from the Kerr one. The non-smooth edge of the shadow is attributed to a transition between different branches of unstable but bounded orbits, known as the fundamental photon orbits, which end up at the light rings. In searching for a minimal theoretical setup to reproduce such a salient feature, in this work, we devise a toy model with axisymmetry, a slowly rotating Kerr black hole enveloped by a thin slowly rotating dark matter shell. Despite its simplicity, we show rich structures regarding fundamental photon orbits explicitly in such a system. We observe two disconnected branches of unstable spherical photon orbits, and the jump between them gives rise to a pair of cusps in the resultant black hole shadow. Besides the cuspy shadow, we explore other intriguing phenomena when the Maxwell construction cannot be established. We find that it is possible to have an incomplete arc of Einstein rings and a “fractured” shadow. The potential astrophysical significance of the corresponding findings is addressed.
Imprenta:
- Publisher: Springer
- Date published: 2022
Source:
- Título: European physical journal c
- ISSN: 14346044
- Volume/Número/Paginação/Ano: v.82, n.91, p.1-14, 2022

Informações sobre o DOI: 10.1140/epjc/s10052-022-10033-5 (Fonte: oaDOI API)

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ABNT

QIAN, Wei-Liang et al. Cuspy and fractured black hole shadows in a toy model with axisymmetry. European physical journal c, v. 82, n. 91, p. 1-14, 2022Tradução . . Disponível em: https://doi.org/10.1140/epjc/s10052-022-10033-5. Acesso em: 07 fev. 2026.
APA

Qian, W. -L., Chen, S., Shao, C. -G., Wang, B., & Yue, R. -H. (2022). Cuspy and fractured black hole shadows in a toy model with axisymmetry. European physical journal c, 82( 91), 1-14. doi:10.1140/epjc/s10052-022-10033-5
NLM

Qian W-L, Chen S, Shao C-G, Wang B, Yue R-H. Cuspy and fractured black hole shadows in a toy model with axisymmetry [Internet]. European physical journal c. 2022 ;82( 91): 1-14.[citado 2026 fev. 07 ] Available from: https://doi.org/10.1140/epjc/s10052-022-10033-5
Vancouver

Qian W-L, Chen S, Shao C-G, Wang B, Yue R-H. Cuspy and fractured black hole shadows in a toy model with axisymmetry [Internet]. European physical journal c. 2022 ;82( 91): 1-14.[citado 2026 fev. 07 ] Available from: https://doi.org/10.1140/epjc/s10052-022-10033-5