Interferometric signatures of black holes with multiple photon spheres

Chen, Yiqian; Wang, Peng; Yang, Haitang

doi:10.1103/physrevd.110.044020

Phys. Rev. D

2024

DOI: 10.1103/physrevd.110.044020

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Interferometric signatures of black holes with multiple photon spheres

Yiqian Chen,

Peng Wang,

Haitang Yang

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2024

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Cited by 2 publications

References 85 publications

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Stationary scalar clouds around Kerr-Newman black holes

Guo,

Wang,

et al. 2024

J. High Energ. Phys.

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This study investigates scalar clouds around Kerr-Newman black holes within the Einstein-Maxwell-scalar model. Tachyonic instabilities are identified as the driving mechanism for scalar cloud formation. Employing the spectral method, we numerically compute wave functions and parameter space existence domains for both fundamental and excited scalar cloud modes. Our analysis demonstrates that black hole spin imposes an upper limit on the existence of scalar clouds, with excited modes requiring stronger tachyonic instabilities for their formation. These findings lay the groundwork for exploring the nonlinear dynamics and astrophysical implications of scalar clouds.

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Stationary scalar clouds around Kerr-Newman black holes

Guo,

Wang,

et al. 2024

J. High Energ. Phys.

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Distinguishing black holes with and without spontaneous scalarization in Einstein-scalar-Gauss–Bonnet theories via optical features

Wang,

Meng,

Kuang

et al. 2024

Eur. Phys. J. C

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Spontaneous scalarization in Einstein-scalar-Gauss–Bonnet theory admits both vacuum-general relativity (GR) and scalarized hairy black holes as valid solutions, which provides a distinctive signature of new physics in strong gravity regime. In this paper, we shall examine the optical features of Gauss–Bonnet black holes with spontaneous scalarization, which is governed by the coupling parameter $$\lambda $$ λ . We find that the photon sphere, critical impact parameter and innermost stable circular orbit all decrease as the increasing of $$\lambda $$ λ . Using observable data from Event Horizon Telescope, we establish the upper limit for $$\lambda $$ λ . Then we construct the optical appearances of the scalarized black holes illuminated by various thin accretions. Our findings reveal that the scalarized black holes consistently exhibit smaller shadow sizes and reduced brightness compared to Schwarzschild black holes. Notably, in the case of thin spherical accretion, the shadow of the scalarized black hole is smaller, but the surrounding bright ring is more pronounced. Our results highlight the observable features of the scalarized black holes, providing a distinguishable probe from their counterpart in GR in strong gravity regime.

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Interferometric signatures of black holes with multiple photon spheres

Cited by 2 publications

References 85 publications

Stationary scalar clouds around Kerr-Newman black holes

Stationary scalar clouds around Kerr-Newman black holes

Distinguishing black holes with and without spontaneous scalarization in Einstein-scalar-Gauss–Bonnet theories via optical features

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