Tidal-charge effects on the superradiance of rotating black holes

Oliveira, de

doi:10.1140/epjc/s10052-020-08570-y

Cited by 5 publications

(3 citation statements)

References 27 publications

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“…The phenomenon of superradiance was considered in ref. [35]. By computing the amplification factors of massless scalar waves, it was found that the tidal charge considerably enhances the energy extraction from near-extreme black holes.…”

Section: Introductionmentioning

confidence: 99%

Effects of tidal charge on magnetic reconnection and energy extraction from spinning braneworld black hole

Wei

Wang

Zhang

et al. 2022

J. Cosmol. Astropart. Phys.

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Recent study shows that the magnetic reconnection can serve as an efficient mechanism to extract energy from rapidly spinning black holes. In this paper, we consider the effects of the tidal charge on the energy extraction via the magnetic reconnection in the backgrounds of a spinning braneworld black hole. With the increase of the tidal charge, we find that both the energies of the accelerated plasma and decelerated plasma decrease for the observer located at infinity. To achieve the purpose extracting the net energy from the black hole, the decelerated plasma should take negative energy. Then we observe that the power of the energy extraction via the magnetic reconnection grows with the tidal charge. Meanwhile, the efficiency also increases with the tidal charge indicating that the spinning braneworld black hole with positive tidal charge is more efficient than the Kerr black hole. Compared with the Blandford-Znajek mechanism, the magnetic reconnection process shall have a higher power for positive tidal charge. These results indicate that the tidal charge has a significant effect on the energy extraction via the magnetic reconnection process.

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Section: Introductionmentioning

confidence: 99%

Effects of tidal charge on magnetic reconnection and energy extraction from spinning braneworld black hole

Wei

Wang

Zhang

et al. 2022

J. Cosmol. Astropart. Phys.

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show abstract

“…Presence of extra spatial dimensions, either through large volume [48,52] or through exponential warping [49,53], can reduce the four dimensional Planck scale to electroweak scale and hence the fine tuning/gauge hierarchy problem can be avoided. Latter studies have shown several other contexts having interesting applications of the higher dimensional scenario, which includes -BHs [54][55][56][57][58][59][60][61][62][63], cosmology [64,65], GWs [17,35,[66][67][68][69][70][71][72][73] among others. In most of these higher dimensional scenario, the effective gravitational dynamics in four dimensions, which is a hypersurface in the full higher dimensional spacetime will be different from that of Einstein gravity.…”

Section: Introductionmentioning

confidence: 99%

Constraining extra dimensions using observations of black hole quasi-normal modes

2022

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The presence of extra dimensions generically modify the spacetime geometry of a rotating black hole, by adding an additional hair, besides the mass M and the angular momentum J, known as the ‘tidal charge’ parameter, $$\beta $$ β . In a braneworld scenario with one extra spatial dimension, the extra dimension is expected to manifest itself through – (a) negative values of $$\beta $$ β , and (b) modified gravitational perturbations. This in turn would affect the quasi-normal modes of rotating black holes. We numerically solve the perturbed gravitational field equations using the continued fractions method and determine the quasi-normal mode spectra for the braneworld black hole. We find that increasingly negative values of $$\beta $$ β correspond to a diminishing imaginary part of the quasi-normal mode, or equivalently, an increasing damping time. Using the publicly available data of the properties of the remnant black hole in the gravitational wave signal GW150914, we check for consistency between the predicted values (for a given $$\beta $$ β ) of the frequency and damping time of the least-damped $$\ell =2,m=2$$ ℓ = 2 , m = 2 quasi-normal mode and measurements of these quantities using other independent techniques. We find that it is highly unlikely for the tidal charge, $$\beta \lesssim -0.05$$ β ≲ - 0.05 , providing a conservative limit on the tidal charge parameter. Implications and future directions are discussed.

show abstract

“…Presence of extra spatial dimensions, either through large volume [45,49] or through exponential warping [46,50], can reduce the four dimensional Planck scale to electroweak scale and hence the fine tuning/gauge hierarchy problem can be avoided. Latter studies have shown several other contexts having interesting applications of the higher dimensional scenario, which includes -BHs [51][52][53][54][55][56][57][58], cosmology [59,60], GWs [17,35,[61][62][63][64][65][66][67][68] among others. In most of these higher dimensional scenario, the effective gravitational dynamics in four dimensions, which is a hypersurface in the full higher dimensional spacetime will be different from that of Einstein gravity.…”

Section: Introductionmentioning

confidence: 99%

Constraining extra dimensions using observations of black hole quasi-normal modes

Mishra,

Ghosh,

Chakraborty

2021

Preprint

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The presence of extra dimensions generically modify the spacetime geometry of a rotating black hole, by adding an additional hair, besides the mass M and the angular momentum J, known as the 'tidal charge' parameter, β. In a braneworld scenario with one extra spatial dimension, the extra dimension is expected to manifest itself through -(a) negative values of β, and (b) modified gravitational perturbations. This in turn would affect the quasi-normal modes of rotating black holes. We numerically solve the perturbed gravitational field equations using the continued fractions method and determine the quasi-normal mode spectra for the braneworld black hole. We find that increasingly negative values of β correspond to a diminishing imaginary part of the quasinormal mode, or equivalently, an increasing damping time. Using the publicly available data of the properties of the remnant black hole in the gravitational wave signal GW150914, we check for consistency between the predicted values (for a given β) of the frequency and damping time of the least-damped = 2, m = 2 quasi-normal mode and measurements of these quantities using other independent techniques. We find that it is highly unlikely for the tidal charge, β < ∼ −0.05, providing a conservative limit on the tidal charge parameter. Implications and future directions are discussed.

show abstract

Tidal-charge effects on the superradiance of rotating black holes

Cited by 5 publications

References 27 publications

Effects of tidal charge on magnetic reconnection and energy extraction from spinning braneworld black hole

Effects of tidal charge on magnetic reconnection and energy extraction from spinning braneworld black hole

Constraining extra dimensions using observations of black hole quasi-normal modes

Constraining extra dimensions using observations of black hole quasi-normal modes

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