Innermost stable circular orbit of Kerr-MOG black hole

Han, Yong-Jin

doi:10.1140/epjc/s10052-017-5152-7

Cited by 29 publications

(17 citation statements)

References 35 publications

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“…So it is of great interest to investigate the properties of the black hole in this gravity theory. Many studies demonstrated that there exist distinct differences between this MOG and GR [54][55][56][57][58][59][60][61][62][63][64][65]. In Refs.…”

Section: Introductionmentioning

confidence: 99%

Shadows of Kerr-like black holes in a modified gravity theory

Wang

Wei

2019

J. Cosmol. Astropart. Phys.

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In this paper, the shadows cast by non-rotating and rotating modified gravity black holes are investigated. In addition to the black hole spin parameter a and the inclination angle θ of observer, another parameter α measuring the deviation of gravitational constant from the Newton one is also found to affect the shape of the black hole shadow. The result shows that, for fixed values of a/M and θ, the size and perimeter of the shadows cast by the non-rotating and rotating black holes significantly increase with the parameter α, while the distortions decrease with α. Moreover, the energy emission rate of the black hole in high energy case is also investigated, and the result shows that the peak of the emission rate decreases with the parameter α.

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Section: Introductionmentioning

confidence: 99%

Shadows of Kerr-like black holes in a modified gravity theory

Wang

Wei

2019

J. Cosmol. Astropart. Phys.

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“…The static and rotating solutions of MOG were obtained in Ref. [34] and followed by research works examining various aspects of these black holes [33,[35][36][37][38][39][40][41][42]. The particular case of rotating black holes known as Kerr-MOG black holes have gained more astrophysical interests since the observed black holes are thought to be rotating.…”

Section: Introductionmentioning

confidence: 99%

“…The particular case of rotating black holes known as Kerr-MOG black holes have gained more astrophysical interests since the observed black holes are thought to be rotating. For example, the particle dynamics [40], the innermost stable circle orbit [39], the accretion disks [33] and the relativistic jets [38] have been studied. Furthermore, the shadows cast by MOG black holes have been studied in Ref.…”

Section: Introductionmentioning

confidence: 99%

Observational signatures of near-extremal Kerr-like black holes in a modified gravity theory at the Event Horizon Telescope

2018

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We study the shadows cast by near-extremal Kerr-MOG black holes for different values of the parameter in modified gravity (MOG). In particular, we consider an isotropic emitter orbiting near such black holes and analytically compute the positions, fluxes and redshift factors of their images. The size of the shadow decreases when the modified parameter is increased. For each shadow, the images of the emitter appear on a special part of the shadow which has a rich structure. The primary image and secondary images are similar to those produced for the near-extremal (high spin) Kerr black hole, but the near-extremal Kerr-MOG black hole can have a spin (Ĵ/M 2 α ) which is finitely lower than 1. When the modified parameter is varied, the typical positions of the corresponding images do not change, nor does the typical redshift factor associated with the primary image. However, another typical redshift factor associated with the secondary image increases when the modified parameter is increased. We also find that the fluxes increase in that case. These images appear periodically with period greater than that of Kerr. This provides an alternative signature away from the Kerr case which may be tested by the Event Horizon Telescope. arXiv:1806.05249v2 [gr-qc] 9 Nov 2018

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“…The quasinormal modes in the ringdown phase of the merging of two Schwarzschild-MOG black holes has been investigated [11]. Other physical features of the MOG black holes and neutron stars have been investigated [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. As an alternative gravity theory MOG has been shown to agree with data for galaxy rotation curves, galaxy dynamics and cosmology without dark matter [30][31][32][33][34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Regular rotating MOG dark compact object

Moffat

2021

Eur. Phys. J. C

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A regular rotating MOG (modified gravity) compact object is derived that reduces to the Kerr black hole when the parameter $$\alpha =0$$ α = 0 . Physical consequences of the dark compact object, which is regular everywhere in spacetime for $$\alpha > \alpha _\mathrm{crit}=0.674$$ α > α crit = 0.674 and is a rotating Kerr-MOG black hole for $$\alpha < \alpha _\mathrm{crit}$$ α < α crit are investigated.

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Innermost stable circular orbit of Kerr-MOG black hole

Cited by 29 publications

References 35 publications

Shadows of Kerr-like black holes in a modified gravity theory

Shadows of Kerr-like black holes in a modified gravity theory

Observational signatures of near-extremal Kerr-like black holes in a modified gravity theory at the Event Horizon Telescope

Regular rotating MOG dark compact object

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