Polarization effects in Kerr black hole shadow due to the coupling between photon and bumblebee field

Chen, Songbai; Jing, Jiliang

doi:10.1007/jhep07(2020)054

Cited by 36 publications

(19 citation statements)

References 56 publications

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“…In order to directly test this kind of coupling, one could look for the higher order geometric optics approximation, which leads to the rotation of polarization vectors along the path of photons and could be tested by the precise measurements of polarizations in principle [66]. For other forms of tensor coupling, we refer readers to [19,20] for more details.…”

Section: Scalar Fieldmentioning

confidence: 99%

“…One type of the works focuses on the possible contamination of the perfect vacuum environments around the black hole, which could arise from the coupling of gravity to other background fields and the accumulation of dark matter due to accretion. Such novel physics modify the black hole metric and leave observable effects on the black hole photon ring [14][15][16][17][18][19][20]. On the other side, the question is about testing gravity theories.…”

Section: Introductionmentioning

confidence: 99%

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New test on the Einstein equivalence principle through the photon ring of black holes

Zhao

Cai

2021

Phys. Rev. D

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Einstein equivalence principle (EEP), as one of the foundations of general relativity, is a fundamental test of gravity theories. In this paper, we propose a new method to test the EEP of electromagnetic interactions through observations of black hole photon rings, which naturally extends the scale of Newtonian and post-Newtonian gravity where the EEP violation through a variable fine structure constant has been well constrained to that of stronger gravity. We start from a general form of Lagrangian that violates EEP, where a specific EEP violation model could be regarded as one of the cases of this Lagrangian. Within the geometrical optical approximation, we find that the dispersion relation of photons is modified: for photons moving in circular orbit, the dispersion relation simplifies, and behaves such that photons with different linear polarizations perceive different gravitational potentials. This makes the size of black hole photon ring depend on polarization. Further assuming that the EEP violation is small, we derive an approximate analytic expression for spherical black holes showing that the change in size of the photon ring is proportional to the violation parameters. We also discuss several cases of this analytic expression for specific models. Finally, we explore the effects of black hole rotation and derive a modified proportionality relation between the change in size of photon ring and the violation parameters. The numerical and analytic results show that the influence of black hole rotation on the constraints of EEP violation is relatively weak for small magnitude of EEP violation and small rotation speed of black holes.

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Section: Scalar Fieldmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New test on the Einstein equivalence principle through the photon ring of black holes

Zhao

Cai

2021

Phys. Rev. D

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“…Then the coupled photons have been studied widely in refs. [11][12][13][14][15][16][17][18]. It indicates that the the interaction between electromagnetic field and curvature tensor changes the path of photons propagation and leads to the birefringence phenomenon of light.…”

Section: Introductionmentioning

confidence: 99%

Double shadow of a 4D Einstein-Gauss-Bonnet black hole and their connection between with quasinormal modes

Liu¹,

Zhang²,

Feng³

et al. 2022

Preprint

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In this paper, we firstly study the shadow of a 4D Einstein-Gauss-Bonnet black hole as photons couple to the Weyl tensor and find that the propagation of light depends on its polarization which leads to the existence of a double shadow. Further, we discuss the effect of the coupling parameter λ, the polarization of light and the Gauss-Bonnet coupling constant α on shadow. Then we explore the influence of the Gauss-Bonnet coupling constant α on the quasinormal modes (QNMs) of massless scalar field and investigate the connection between the real part of QNMs in the eikonal limit and the modified shadow radius of black holes. We find that in the eikonal limit the real part of QNMs is inversely proportional to the shadow radius, which is also applicable in the case of the photons coupled to the Weyl tensor.

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“…In particular, some interesting results related to the black hole shadows have been found. For examples, one can see the black hole shadows in the regularized 4D Einstein-Gauss-Bonnet gravities in [21][22][23][24], the shadows of black holes in an expanding universe in [25][26][27], the cuspy and fractured black hole shadows in [28,29], the black holes furnished by non-geodesic photons in [30,31] and the novel shadows from the asymmetric thin-shell wormhole in [32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Revisiting the shadow of braneworld black holes

2021

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We revisit the shadows of rotating braneworld black holes in the Randall-Sundrum type II model, by considering not only the metric in the near region of the black hole but also the linearized metric in the far region where the observer stays. Our study is significantly different from previous studies, which relies only on the metric in the near region. From the study, we identify a critical angle θ c which decides the shadow curve is open or closed: the shadow curve would be open if the observational angle θ c < θ o ≤ π/2, and the curve becomes closed when 0 < θ o ≤ θ c . We study how various parameters affect the shape of the shadow curve. We furthermore apply our analysis to the data of M87* from the Event Horizon Telescope and obtain a new constraint on the parameters of the braneworld black holes.

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Polarization effects in Kerr black hole shadow due to the coupling between photon and bumblebee field

Cited by 36 publications

References 56 publications

New test on the Einstein equivalence principle through the photon ring of black holes

New test on the Einstein equivalence principle through the photon ring of black holes

Double shadow of a 4D Einstein-Gauss-Bonnet black hole and their connection between with quasinormal modes

Revisiting the shadow of braneworld black holes

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