Absorption by stringy black holes

Xavier, Sérgio V. M. C. B.; Benone, Carolina L.; Crispino, Luís C. B.

doi:10.1140/epjc/s10052-021-09933-9

Cited by 6 publications

(2 citation statements)

References 45 publications

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“…( 94) and angular velocity is Ω ph with the radius of the photon sphere r ph . Hence, the Sinc approximation said that the total absorption cross section at the eikonal limit is σ abs ≈ σ osc +σ geo [123,[125][126][127][128][129][130]. In the Fig.…”

Section: Bounds Of Greybody Factors and High-energy Absorption Cross-...mentioning

confidence: 99%

Testing dynamical torsion effects on the charged black hole's shadow, deflection angle and greybody with M87* and Sgr A* from EHT

Pantig¹,

Овгун²

2022

Preprint

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Poincare Gauge's theory of gravity is the most noteworthy alternative extension of general relativity that has a correspondence between spin and spacetime geometry. In this paper, we used Reissner-Nordstrom-de Sitter and anti-de Sitter solutions, where torsion τ is added as an independent field, to analyze the weak deflection angles α of massive and null particles in finite distance regime. We then applied α to determine the Einstein ring formation in M87* and Sgr. A* and determine that relative to Earth's location from these black holes, massive torsion effects can provide considerable deviation, while the cosmological constant's effect remains negligible. Furthermore, we also explored how the torsion parameter affects the shadow radius perceived by both static and co-moving (with cosmic expansion) observers in a Universe dominated by dark energy, matter, and radiation. Our findings indicate that torsion and cosmological constant parameters affect the shadow radius differently between observers in static and co-moving states. We have also shown how the torsion parameter affects the luminosity of the photonsphere by studying the shadow with infalling accretion. The calculation of the quasinormal modes, greybody bounds, and high-energy absorption cross-section was also affected by the torsion parameter considerably.

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Section: Bounds Of Greybody Factors and High-energy Absorption Cross-...mentioning

confidence: 99%

Testing dynamical torsion effects on the charged black hole's shadow, deflection angle and greybody with M87* and Sgr A* from EHT

Pantig¹,

Овгун²

2022

Preprint

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show abstract

“…x ) with the photon sphere. This method extensively discussed in the literature [197][198][199][200][201][202][203]. In the limit of high energy, the oscillatory part of the absorption cross-section can be calculated by using [144]:…”

Section: Bounds Of Greybody Factors and High-energy Absorption Cross-...mentioning

confidence: 99%

Shadow, lensing and neutrino propagation by dyonic ModMax black holes

Pantig¹,

Mastrototaro²,

Lambiase³

et al. 2022

Preprint

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Motivated by recent work on the Modified Maxwell (ModMax) black holes [Phys. Lett.B 10.1016Lett.B 10. /j.physletb.2020, which are invariant in duality rotations and conformal transformations founded in [ Phys.Rev.D 10.1103/PhysRevD.102.121703], we probe its effects on the shadow cast, weak field gravitational lensing, and neutrino propagation in its vicinity. Using the EHT data for the shadow diameter of Sgr. A* and M87*, and LIGO/VIRGO experiments for the dyonic ModMax black hole perturbations, we find constraints for ModMax parameters such as Qm and the screening factor γ. We also analyze how the shadow radius behaves as perceived by a static observer and one that is comoving with the cosmic expansion. The effect of the ModMax parameters is constant for a static observer, and we found That it varies when the observer is comoving with cosmic expansion. We also analyzed its effect on the weak deflection angle by exploiting the Gauss-Bonnet theorem and its application to Einstein ring formation. We also consider the finite distance effect and massive particle deflection. Our results indicate that the far approximation of massive particle gives the largest deflection angle and amplifies the effect of Qm and γ. With the advent of improving space technology, we reported that it is possible to detect the deviation caused through the shadow cast, Einstein rings, quasinormal modes, and neutrino oscillations.

show abstract

Testing dynamical torsion effects on the charged black hole’s shadow, deflection angle and greybody with M87* and Sgr. A* from EHT

Pantig

Овгун

2023

Annals of Physics

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Absorption by stringy black holes

Cited by 6 publications

References 45 publications

Testing dynamical torsion effects on the charged black hole's shadow, deflection angle and greybody with M87* and Sgr A* from EHT

Testing dynamical torsion effects on the charged black hole's shadow, deflection angle and greybody with M87* and Sgr A* from EHT

Shadow, lensing and neutrino propagation by dyonic ModMax black holes

Testing dynamical torsion effects on the charged black hole’s shadow, deflection angle and greybody with M87* and Sgr. A* from EHT

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