Black holes with cloud of strings and quintessence in Lovelock gravity

Toledo, J. M.; Bezerra, V. B.

doi:10.1140/epjc/s10052-018-6001-z

Cited by 69 publications

(22 citation statements)

References 35 publications

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“…Let us start with the spherically symmetric and static BH solution in the quintessential background, which is surrounded by a cloud of strings [37][38][39], namely:…”

Section: A Dirac Equationmentioning

confidence: 99%

Greybody factor and perturbation of a Schwarzschild black hole with string clouds and quintessence

Al-Badawi

2022

Preprint

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In this paper, we investigated the Dirac and Klein-Gordan equations, as well as the greybody factor for a Schwarzschild black hole (SBH) immersed in quintessence and associated with a cloud of strings. Primarily, we study the Dirac equation using a null tetrad in the Newman-Penrose (NP) formalism. Next, we separate the Dirac equation into radial and angular sets. Using the radial equations, we study the profile of effective potential by transforming the radial equation of motion into standard Schrödinger wave equations form through tortoise coordinate. Similarly, we study the Klein-Gordan equation in this spacetime. The Miller-Good transformation method is employed to compute the greybody factor of bosons. To compute the Gerybody factor for fermions, we use the general method of semi-analytical bounds. We also investigate the effect of string clouds and quintessence parameters on Hawking radiation. According to the results, the greybody factor is strongly influenced by the shape of the potential, which is determined by the model parameters. This is consistent with the ideas of quantum mechanics; as the potential rises, it becomes harder for the wave to penetrate.

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“…Let us start with the spherically symmetric and static BH solution in the quintessential background, which is surrounded by a cloud of strings [37][38][39], namely:…”

Section: A Dirac Equationmentioning

confidence: 99%

Greybody factor and perturbation of a Schwarzschild black hole with string clouds and quintessence

Al-Badawi

2022

Preprint

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“…The spherically symmetric and static spacetime in the background of quintessence and cloud of strings is given as [41,42]:…”

Section: Basic Calculations Of Particle Trajectoriesmentioning

confidence: 99%

Radial and circular motion of photons and test particles in the Schwarzschild black hole with quintessence and string clouds

Mustafa

Hussain

2021

Eur. Phys. J. C

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The null and timelike geodesic motion in the vicinity of the Schwarzschild black hole in the presence of the string cloud parameter a and the quintessence field parameter q is studied. The ranges for both the parameters a and q are determined, which allow the existence of the black hole. In the radial motion of photon, the coordinate time t first decreases with the increasing values of both the parameters a and q and then in the close proximity of the horizon of the black hole, there is a turning point, after which the effect of the quintessence field is just opposite on the time t. For the massive particles, the proper time $$\tau $$ τ decreases with increasing values of the parameter a and increases with increase in the value of the parameter q. In the same case of the massive particles, the coordinate time t decreases with increase in the values of both the parameters a and q. Further, it is found that for test particles, the stable circular orbits exist in this spacetime for small values of both the parameters i.e., for $$0<a\ll 1$$ 0 < a ≪ 1 and $$0<q\ll 1$$ 0 < q ≪ 1 . It is observed that the radii of the null circular orbits increase as the values of the parameters a and q increase. While in the case of the timelike geodesics, the radii of the circular orbits increase as the value of the parameter a increases, and they decrease as the value of the parameter q increases.

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“…Such black has been derived and discussed in Refs. [21][22][23], and its geodesic structure regarding the radial orbits has been investigated in Ref. [24].…”

Section: Introductionmentioning

confidence: 99%

Probing the parameters of a Schwarzschild black hole surrounded by quintessence and cloud of strings through four standard astrophysical tests

et al. 2021

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In this paper, we concern about applying general relativistic tests on the spacetime produced by a static black hole associated with cloud of strings, in a universe filled with quintessence. The four tests we apply are precession of the perihelion in the planetary orbits, gravitational redshift, deflection of light, and the Shapiro time delay. Through this process, we constrain the spacetime’s parameters in the context of the observational data, which results in about $$\sim 10^{-9}$$ ∼ 10 - 9 for the cloud of strings parameter, and $$\sim 10^{-20}$$ ∼ 10 - 20 m$$^{-1}$$ - 1 for that of quintessence. The response of the black hole to the gravitational perturbations is also discussed.

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Black holes with cloud of strings and quintessence in Lovelock gravity

Cited by 69 publications

References 35 publications

Greybody factor and perturbation of a Schwarzschild black hole with string clouds and quintessence

Greybody factor and perturbation of a Schwarzschild black hole with string clouds and quintessence

Radial and circular motion of photons and test particles in the Schwarzschild black hole with quintessence and string clouds

Probing the parameters of a Schwarzschild black hole surrounded by quintessence and cloud of strings through four standard astrophysical tests

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