Orbits of light rays in (1＋2)-dimensional Einstein–power–Maxwell gravity: Exact analytical solution to the null geodesic equations

Panotopoulos, Grigoris; Rincón, Ángel

doi:10.1016/j.aop.2022.168947

Cited by 13 publications

(2 citation statements)

References 84 publications

(65 reference statements)

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“…[ 18,19 ] We can gather data to derive these characteristics by studying black hole shadows, which are essentially dark representations of their event horizon, and photon rings, which are dazzling images formed by photons circling around black holes, [ 20–22 ] which are especially noteworthy since they provide accurate gravity constraints in the strong‐field regime. [ 21,23–53 ] These discrepancies could be caused by many reasons linked with several alternative theories of gravity [ 54–68 ] or the surrounding astrophysical conditions in which the black hole is located. [ 69–76 ] Therefore, it becomes crucial to investigate modified gravity theories and establish constraints by utilizing the black hole's shadow alongside astrophysical data, such as observations from telescopes like EHT.…”

Section: Introductionmentioning

confidence: 99%

Asymptotically‐Flat Black Hole Solutions in Symmergent Gravity

Puliçe,

Pantig,

Övgün

et al. 2024

Fortschritte der Physik

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Symmergent gravity is an emergent gravity model with an curvature sector and an extended particle sector having new particles beyond the known ones. With constant scalar curvature, asymptotically flat black hole solutions are known to have no sensitivity to the quadratic curvature term (coefficient of ). With variable scalar curvature, however, asymptotically‐flat symmergent black hole solutions turn out to explicitly depend on the quadratic curvature term. In the present work, asymptotically‐flat symmergent black holes with variable scalar curvature are constructed and used its evaporation, shadow, and deflection angle to constrain the symmergent gravity parameters. Concerning their evaporation, new particles predicted by symmergent gravity are found, even if they do not interact with the known particles, can enhance the black hole evaporation rate. Concerning their shadow, statistically significant symmergent effects are reached at the level for the observational data of the Event Horizon Telescope (EHT) on the Sagittarius A* supermassive black hole are shown. Concerning their weak deflection angle, discernible features for the boson‐fermion number differences are revealed, particularly at large impact parameters. These findings hold the potential to serve as theoretical predictions for future observations and investigations on black hole properties.

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Section: Introductionmentioning

confidence: 99%

Asymptotically‐Flat Black Hole Solutions in Symmergent Gravity

Puliçe,

Pantig,

Övgün

et al. 2024

Fortschritte der Physik

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“…It would take more years, or even more sophisticated equipment, to probe other theories of gravity using the black hole. Ever since many authors have considered exploring the behavior of the classical shadow silhouette for black holes [15,18] described by either a toy model metric or through an alternative theory of gravity [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Testing symmergent gravity through the shadow image and weak field photon deflection by a rotating black hole using the M87$$^$$ and Sgr. $$\hbox {A}^$$ results

Pantig

Овгун²,

Demir

2023

Eur. Phys. J. C

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In this paper, we study rotating black holes in symmergent gravity, and use deviations from the Kerr black hole to constrain the parameters of the symmergent gravity. Symmergent gravity induces the gravitational constant G and quadratic curvature coefficient $$c_{\textrm{O}}$$ c O from the flat spacetime matter loops. In the limit in which all fields are degenerate in mass, the vacuum energy $$V_{\textrm{O}}$$ V O can be wholly expressed in terms of G and $$c_{\textrm{O}}$$ c O . We parametrize deviation from this degenerate limit by a parameter $${\hat{\alpha }}$$ α ^ such that the black hole spacetime is dS for $${\hat{\alpha }} < 1$$ α ^ < 1 and AdS for $${\hat{\alpha }} > 1$$ α ^ > 1 . In constraining the symmergent parameters $$c_{\textrm{O}}$$ c O and $${\hat{\alpha }}$$ α ^ , we utilize the EHT observations on the M87* and Sgr. A* black holes. We investigate first the modifications in the photon sphere and shadow size, and find significant deviations in the photonsphere radius and the shadow radius with respect to the Kerr solution. We also find that the geodesics of time-like particles are more sensitive to symmergent gravity effects than the null geodesics. Finally, we analyze the weak field limit of the deflection angle, where we use the Gauss-Bonnet theorem for taking into account the finite distance of the source and the receiver to the lensing object. Remarkably, the distance of the receiver (or source) from the lensing object greatly influences the deflection angle. Moreover, $$c_{\textrm{O}}$$ c O needs be negative for a consistent solution. In our analysis, the rotating black hole acts as a particle accelerator and possesses the sensitivity to probe the symmergent gravity.

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Three-dimensional AdS black holes in massive-power-Maxwell theory

Panah,

Jafarzade,

Rincón

2024

Gen Relativ Gravit

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Orbits of light rays in (1＋2)-dimensional Einstein–power–Maxwell gravity: Exact analytical solution to the null geodesic equations

Cited by 13 publications

References 84 publications

Asymptotically‐Flat Black Hole Solutions in Symmergent Gravity

Asymptotically‐Flat Black Hole Solutions in Symmergent Gravity

Testing symmergent gravity through the shadow image and weak field photon deflection by a rotating black hole using the M87$$^$$ and Sgr. $$\hbox {A}^$$ results

Three-dimensional AdS black holes in massive-power-Maxwell theory

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Orbits of light rays in (1＋2)-dimensional Einstein–power–Maxwell gravity: Exact analytical solution to the null geodesic equations

Cited by 13 publications

References 84 publications

Asymptotically‐Flat Black Hole Solutions in Symmergent Gravity

Asymptotically‐Flat Black Hole Solutions in Symmergent Gravity

Testing symmergent gravity through the shadow image and weak field photon deflection by a rotating black hole using the M87$$^*$$ and Sgr. $$\hbox {A}^*$$ results

Three-dimensional AdS black holes in massive-power-Maxwell theory

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Testing symmergent gravity through the shadow image and weak field photon deflection by a rotating black hole using the M87$$^$$ and Sgr. $$\hbox {A}^$$ results