Scalar QNMs for higher dimensional black holes surrounded by quintessence in Rastall gravity

Graça, J. P. Morais; Lobo, Iarley P.

doi:10.1140/epjc/s10052-018-5598-2

Cited by 38 publications

(13 citation statements)

References 28 publications

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“…The details about the quasinormal modes can be found in Rs. [126][127][128][129][130][131][132][133][134][135][136][137]. To calculate the quasinormal mode frequencies of a compact object it is necessary to use an external field surrounding the object as a probe, which can give a measure of the perturbation in the object.…”

Section: Quasinormal Modesmentioning

confidence: 99%

Tideless traversable wormholes surrounded by cloud of strings in f(R) gravity

Gogoi

Goswami

2023

J. Cosmol. Astropart. Phys.

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We study the tideless traversable wormholes in the f(R) gravity metric formalism. First we consider three shape functions of wormholes and study their viabilities and structures. The connection between the f(R) gravity model and wormhole shape function has been studied and the dependency of the f(R) gravity model with the shape function is shown. We also obtain a wormhole solution in the f(R) gravity Starobinsky model surrounded by a cloud of strings. In this case, the wormhole shape function depends on both the Starobinsky model parameter and the cloud of strings parameter. The structure and height of the wormhole is highly affected by the cloud of strings parameter, while it is less sensitive to the Starobinsky model parameter. The energy conditions have been studied and we found the ranges of the null energy condition violation for all wormhole structures. The quasinormal modes from these wormhole structures for the scalar and Dirac perturbations are studied using higher order WKB approximation methods. The quasinormal modes for the toy shape functions depend highly on the model parameters. In case of the Starobinsky model's wormhole the quasinormal frequencies and the damping rate increase with an increase in the Starobinsky model parameter in scalar perturbation. Whereas in Dirac perturbation, with an increase in the Starobinsky model parameter the quasinormal frequencies decrease and the damping rate increases. The cloud of strings parameter also impacts prominently and differently the quasinormal modes from the wormhole in the Starobinsky model.

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Section: Quasinormal Modesmentioning

confidence: 99%

Tideless traversable wormholes surrounded by cloud of strings in f(R) gravity

Gogoi

Goswami

2023

J. Cosmol. Astropart. Phys.

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“…The real part of the quasinormal modes is related to the emission frequency, while the imaginary part is connected to its damping. In recent times, the properties of GWs and quasinormal modes of black holes were studied extensively in different modified gravity theories [21][22][23][24][25][26][27][28][29][30][31][32][33]. In ref.…”

Section: Introductionmentioning

confidence: 99%

Quasinormal modes and Hawking radiation sparsity of GUP corrected black holes in bumblebee gravity with topological defects

Gogoi

Goswami

2022

J. Cosmol. Astropart. Phys.

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We have obtained the Generalized Uncertainty Principle (GUP) corrected de Sitter and anti-de Sitter black hole solutions in bumblebee gravity with a topological defect. We have calculated the scalar, electromagnetic and gravitational quasinormal modes for the both vanishing and non-vanishing effective cosmological constant using Padé averaged sixth order WKB approximation method. Apart from this, the time evolutions for all three perturbations are studied, and quasinormal modes are calculated using the time domain profile. We found that the first order and second order GUP parameters α and β, respectively have opposite impacts on the quasinormal modes. The study also finds that the presence of a global monopole can decrease the quasinormal frequencies and the decay rate significantly. On the other hand, Lorentz symmetry violation has noticeable impacts on the quasinormal frequencies and the decay rate. We have studied the greybody factors, power spectrum and sparsity of the black hole with the vanishing effective cosmological constant for all the three perturbations. The presence of Lorentz symmetry breaking and the GUP parameter α decrease, while other GUP parameter β and the presence of global monopole increase the probability of Hawking radiation to reach the spatial infinity. The presence of Lorentz violation can make the black holes less sparse, while the presence of a global monopole can increase the sparsity of the black holes. Moreover, we have seen that the black hole area quantization rule is modified by the presence of Lorentz symmetry breaking.

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“…Study of quasinormal modes of these black holes surrounded by quintessence is an interesting topic. The effects of the quintessential parameter on quasinormal frequencies of different black hole spacetimes were studied in [84][85][86][87][88][89][90][91][92].…”

Section: Introductionmentioning

confidence: 99%

Scalar perturbations and quasi-normal modes of a nonlinear magnetic-charged black hole surrounded by quintessence

2019

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We study scalar perturbations and quasinormal modes of a nonlinear magnetic charged black hole surrounded by quintessence. Time evolution of scalar perturbations is studied for different parameters associated with the black hole solution. We also study the reflection and transmission coefficients along with absorption cross-section for the considered black hole spacetime. It was shown that the real part of quasinormal frequency increases with increase in nonlinear magnetic charge while the module of the imaginary part of the frequency decreases. The analysis of the perturbations with changing quintessential parameter c showed that perturbations with high values of c become unstable.

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Scalar QNMs for higher dimensional black holes surrounded by quintessence in Rastall gravity

Cited by 38 publications

References 28 publications

Tideless traversable wormholes surrounded by cloud of strings in f(R) gravity

Tideless traversable wormholes surrounded by cloud of strings in f(R) gravity

Quasinormal modes and Hawking radiation sparsity of GUP corrected black holes in bumblebee gravity with topological defects

Scalar perturbations and quasi-normal modes of a nonlinear magnetic-charged black hole surrounded by quintessence

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