Quasinormal modes and optical properties of 4-D black holes in Einstein Power-Yang–Mills gravity

Gogoi, Dhruba Jyoti; Bora, Jyatsnasree; Koussour, M.; Sekhmani, Yassine

doi:10.1016/j.aop.2023.169447

Cited by 4 publications

(3 citation statements)

References 109 publications

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“…This section delves into the fascinating and complex phenomena of black hole shadows and their associated emission rates, shedding light on the mysterious nature of these cosmic behemoths. Black holes, characterized by their incredibly powerful gravitational pull, create an environment where even light cannot escape once it crosses the event horizon [72][73][74][75]. This unique property gives rise to what is known as the black hole shadow, a darkened region in space-time that envelops the event horizon.…”

Section: Optical Properties Of the Black Holementioning

confidence: 99%

“…The study of these shadows has been a topic of great interest and importance in astrophysics, as they offer a glimpse into the otherwise hidden properties of these enigmatic objects. Recent advancements in astronomical observation and imaging technology have made it possible to capture detailed images of these elusive black hole shadows, marking a significant milestone in our understanding of these cosmic phenomena [72,74,76].…”

Section: Optical Properties Of the Black Holementioning

confidence: 99%

“…Equations ( 59) and ( 60) establish the connection between the celestial coordinates and the impact parameters for observers positioned at inclination angles θ 0 = π/2 and θ 0 = 0, respectively [79]. These equations are fundamental for extracting information regarding the shadows of black holes [72][73][74].…”

Section: A Shadow Radiusmentioning

confidence: 99%

See 2 more Smart Citations

Technical Efficiency of Organic Tea Growers of Assam, India: A study in Dibrugarh District

Gogoi¹,

Buragohain

Gogoi³

2022

EEA

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Organic tea cultivation is a most emerging farming activity in recent years. Assam is only the state of India, where the highest tea is produced. Organic tea farming is a new concept for the state Assam. The study focuses on to estimate the technical efficiency level of organic tea growers. The Stochastic Frontier Analysis (SFA) is used to estimate the efficiency level of the growers by conducting a survey in Dibrugarh district of Assam, where the highest organic tea growers are concentrated. The study found- Mean technical efficiency of organic tea growers is 0.91. The variables organic fertilizer, organic pesticide, manure, machine and land area under tea cultivation are found statistically significant. On the other hand the variable labour man days found insignificant result with output.

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Section: Optical Properties Of the Black Holementioning

confidence: 99%

Section: Optical Properties Of the Black Holementioning

confidence: 99%

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Technical Efficiency of Organic Tea Growers of Assam, India: A study in Dibrugarh District

Gogoi¹,

Buragohain

Gogoi³

2022

EEA

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Violation of Hod’s conjecture and probing it with optical properties of a 5-D black hole in Einstein Gauss–Bonnet Bumblebee theory of gravity

Gogoi

2024

Physics of the Dark Universe

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The optical features of noncommutative charged 4D-AdS-Einstein–Gauss–Bonnet black hole: shadow and deflection angle

Lekbich,

Parbin,

Gogoi

et al. 2024

Eur. Phys. J. C

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In this paper, we have explored the optical characteristics, namely the shadow and the deflection angle, inherent to the solution of a 4D-AdS-Einstein–Gauss–Bonnet black hole. This solution, which finds its inspiration in noncommutative geometry, had previously been established in our previous work. The radius of the shadow was determined using the Hamilton-Jacobi method and the Carter separation. Our results revealed that the presence of noncommutativity in the background of spacetime impacts the variation of the shadow radius. More specifically, we have demonstrated that an increase in the parameter $$\theta $$ θ induces a decrease in the radius of the shadow. In a similar way, analogous observations have been made by studying the variation of the electric charge Q. The noncommutative parameter $$\theta $$ θ and the electric charge Q have been constrained regarding the EHT observation data of the M87* and Sgr A* black holes. Furthermore, the angle of deflection, which is the outcome of lensing by the black hole, has been derived following the Ishihara et al. approach for a receiver and source positioned at finite distances from the black hole in an asymptotically non-flat spacetime. The impact of the noncommutative parameter $$\theta $$ θ and the charge Q of the black hole are hence analyzed, and our results depict that these parameters have a significant influence on the angle at which light is deflected by the gravitational field of the black hole.

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Quasinormal modes and optical properties of 4-D black holes in Einstein Power-Yang–Mills gravity

Cited by 4 publications

References 109 publications

Technical Efficiency of Organic Tea Growers of Assam, India: A study in Dibrugarh District

Technical Efficiency of Organic Tea Growers of Assam, India: A study in Dibrugarh District

Violation of Hod’s conjecture and probing it with optical properties of a 5-D black hole in Einstein Gauss–Bonnet Bumblebee theory of gravity

The optical features of noncommutative charged 4D-AdS-Einstein–Gauss–Bonnet black hole: shadow and deflection angle

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