Accretion on Reissner–Nordström–(anti)-de Sitter black hole with global monopole

Ahmed, Adeel; Camcı, Uğur; Jamil, Mubasher

doi:10.1088/0264-9381/33/21/215012

Cited by 31 publications

(17 citation statements)

References 29 publications

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“…The particle and energy conservation during the accretion procedure are ∇ µ (nu µ ) = 0 and ∇ µ T µν = 0 respectively, where u µ = dx µ dτ is the four-velocity of the fluid particles (τ is the proper time) and n is the particle density. Introducing the three-velocity as [105] v = 1 AB u r u t , and using the steps developed in [106][107][108][109][110][111], we obtain the location r c of the critical point (CP) and the value of the corresponding three-velocity as…”

Section: Appendix a Accretion Of Matter Onto Black Holes With Barrow ...mentioning

confidence: 99%

Constraints on Barrow Entropy from M87* and S2 Star Observations

et al. 2022

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We use data from M87* central black hole shadow, as well as from the S2 star observations, in order to extract constraints on Barrow entropy. The latter is a modified entropy arising from quantum-gravitational effects on the black hole horizon, quantified by the new parameter Δ. Such a change in entropy leads to a change in temperature, as well as to the properties of the black hole and its shadow. We investigate the photon sphere and the shadow of a black hole with Barrow entropy, and assuming a simple model for infalling and radiating gas we estimate the corresponding intensity. Furthermore, we use the radius in order to extract the real part of the quasinormal modes, and for completeness we investigate the spherical accretion of matter onto the black hole, focusing on isothermal and polytropic test fluids. We extract the allowed parameter region, and by applying a Monte-Carlo-Markov Chains analysis we find that Δ≃0.0036−0.0145+0.0792. Hence, our results place the upper bound Δ≲0.0828 at 1σ, a constraint that is less strong than the Big Bang Nucleosynthesis one, but significantly stronger than the late-time cosmological constraints.

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Section: Appendix a Accretion Of Matter Onto Black Holes With Barrow ...mentioning

confidence: 99%

Constraints on Barrow Entropy from M87* and S2 Star Observations

et al. 2022

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“…It is worth mentioning that, in 1989, Barriola and Vilenkin [1] first discovered the gravitational field of a global monopole and determined the metric of the black hole with a global monopole. Since then, the physical properties of black holes incorporating global monopoles have been studied extensively [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. However, thermodynamical properties of the black holes with global monopoles in AdS spacetime still remain obscure, although it deserves a deeper investigation of the thermodynamics.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics and phase transition of charged AdS black holes with a global monopole

Deng

Fan

et al. 2018

Int. J. Mod. Phys. A

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Thermodynamical properties of charged AdS black holes with a global monopole still remain obscure. In this paper, we investigate the thermodynamics and phase transition of the black holes in the extended phase space. It is shown that thermodynamical quantities of the black holes exhibit an interesting dependence on the internal global monopole, and they perfectly satisfy both the first law of thermodynamics and Smarr relation. Furthermore, analysis of the local and the global thermodynamical stability manifests that the charged AdS black hole undergoes an elegant phase transition at critical point. Of special interest, critical behaviors of the black holes resemble a Van der Waals liquid-gas system. Our results not only reveal the effect of a global monopole on thermodynamics of AdS black holes, but also further support that Van der Waals-like behavior of the black holes is a universal phenomenon. *

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“…The relativistic statement of the flux of mass-energy density is modeled by Ṁ| rh = 4πr 2 T r t | rh (see, [52]- [56]). The energy-momentum tensor of perfect fluid is given by T r t = (ρ + p)u t u r [50,55]. As energy of our dynamical system is conserved so we have ∇ µ J µ ≡ 0 and ∇ ν T µν ≡ 0, from these conservation equations it follows that…”

Section: Hole's Accretion Ratementioning

confidence: 99%

Accretion of matter onto black holes in massive gravity with Lorentz symmetry breaking

Jawad,

Jusufi,

Shahzad

2021

Preprint

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In this paper we study the accretion of matter onto the black holes and the shadow images obtained by an infalling accretion flow of gas in a theory of massive gravity (MG) with a spontaneously breaking Lorentz symmetry. This black hole solution is characterized by mass M, scalar charge S and the parameter λ. In order to extract the astrophysical results of our analyses, firstly, we have assumed a specific range for the parameter λ to constrain the scalar charge S using the EHT result. To this end, we have studied the effect of the scalar charge on the intensity of the electromagnetic radiation from the black hole. Moreover, we investigate the behavior of polytropic as well as the isothermal fluid flow onto massive gravity black hole and notice that accretion starts from supersonic/subsonic flow, passes through the critical point using particular model parameter and ends near the horizon. We also analyzed the mass accretion rate in the presence of various fluids which indicates important signatures. We also elaborate on the possibility to analyze the phase transition and the stability of the black hole using the shadow formalism.

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Accretion on Reissner–Nordström–(anti)-de Sitter black hole with global monopole

Cited by 31 publications

References 29 publications

Constraints on Barrow Entropy from M87* and S2 Star Observations

Constraints on Barrow Entropy from M87* and S2 Star Observations

Thermodynamics and phase transition of charged AdS black holes with a global monopole

Accretion of matter onto black holes in massive gravity with Lorentz symmetry breaking

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