Dynamics and epicyclic motions of particles around the Schwarzschild–de Sitter black hole in perfect fluid dark matter

Rayimbaev, Javlon; Shaymatov, Sanjar; Jamil, Mubasher

doi:10.1140/epjc/s10052-021-09488-9

Cited by 57 publications

(22 citation statements)

References 82 publications

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“…Many of the observed features and variations are markedly distinct, from Hydrogen plasma effects that have been previously explored in the literature [54][55][56][57][58][59], and electromagnetically neutral perfect fluid dark matter studies with phantom field-like equations of state considered earlier [43][44][45][46][47][48][49][50][51]. We find that the the photon sphere radius increases and the shadow radius decreases as the dark matter plasma effect becomes more pronounced, as a function of the millicharged particle mass and charge.…”

Section: Discussionmentioning

confidence: 54%

“…The effects on the black hole characteristics due to a modification of the spacetime background by any surrounding dark matter or exotic fields has also received much attention in recent years (see [37][38][39][40][41][42] and related references, for instance). In particular, there have been a few recent studies [43][44][45][46][47][48][49][50][51] that have considered effects due to a perfect fluid DM, with a special equation of state [52,53] that is quintessential or phantom field like with P r −ρ, surrounding a black hole. In contrast to these studies, our focus in this work will be on studying the effects due to a DM plasma, furnished by mCP components, taking phenomenologically viable mCP and semi-realistic astrophysical scenarios.…”

Section: Introductionmentioning

confidence: 99%

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Exploring millicharged dark matter components from the shadows

Bhandari,

Thalapillil

2021

Preprint

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Dark matter sectors with hidden interactions have been of much interest in recent years. These frameworks include models of millicharged particles as well as dark sector bound states, whose constituents have electromagnetic gauge interactions. These exotic, charged states could constitute a part of the total dark matter density. In this work, we explore in some detail the various effects, on the photon sphere and shadow of spherically symmetric black holes, due to dark matter plasmas furnished by such sectors. Estimating physically viable parameter spaces for the particle physics models and taking semi-realistic astrophysical scenarios that are amenable to theoretical analyses, we point out various modifications and characteristics that may be present. Many of these effects are unique and very distinct from analogous situations with conventional baryonic plasmas, or neutral perfect fluid dark matter surrounding black holes. While in many physically viable regions of the parameter space the effects on the near-horizon regions and black hole shadows are small, in many parts of the low particle mass regions the effects are significant, and potentially measurable by current and future telescopes. Such deviations, for instance, include characteristic changes in the photon sphere and black hole shadow radii, unique thresholds for the dark matter plasma dispersion where the photon sphere or black hole shadow vanishes, and where the dark matter plasma becomes opaque to electromagnetic waves. Alternatively, we point out that a non-observation of such deviations and characteristics, in future, could put constraints on interesting regions of the particle physics parameter space.

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Section: Discussionmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Exploring millicharged dark matter components from the shadows

Bhandari,

Thalapillil

2021

Preprint

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“…A vanishing Lyapunov exponent designates the existence of marginal stability. Geodesic stability analysis in terms of Lyapunov exponents begins with the equations of motion, schematically written as [112,113]:…”

Section: Instability Of Circular Orbitmentioning

confidence: 99%

“…The angular velocity of particles measured by a distant observer or so-called Keplerian frequency is determined as [26,113,114]:…”

Section: Keplerian Frequencymentioning

confidence: 99%

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Dynamics of Magnetized and Magnetically Charged Particles around Regular Nonminimal Magnetic Black Holes

et al. 2021

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The present paper is devoted to the study of the event horizon properties of spacetime around a regular nonminimal magnetic black hole (BH), together with dynamics of magnetized and magnetically charged particles in the vicinity of the BH. It is shown that the minimum value of the outer horizon of the extreme charged BH increases with the increase in coupling parameter. It reaches its maximum value of 1.5M when q→∞, while the maximal value of the BH charge decreases and tends toward zero. We also present a detailed analysis of magnetized particles’ motion around a regular nonminimal magnetic black hole. The particle’s innermost circular stable orbits (ISCOs) radius decreases as the magnetic charge and the parameter β increase and the coupling parameter of Yang–Mills field causes a decrease at the values of the magnetic charge near to its maximum. We show that the magnetic charge can mimic the spin of a rotating Kerr black hole up to the value of a=0.7893M, providing the same value for an ISCO of a magnetized particle with the parameter β=10.2 when the coupling parameter is q=0. Moreover, Lyapunov exponents, Keplerian orbits and harmonic oscillations of magnetized particles motion are also discussed.

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Constraints via the Event Horizon Telescope for Black Hole Solutions with Dark Matter under the Generalized Uncertainty Principle Minimal Length Scale Effect

Övgün,

Sese,

Pantig

2023

Annalen der Physik

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Four spherically symmetric but non‐asymptotically flat black hole solutions surrounded with spherical dark matter distribution perceived under the minimal length scale effect is derived via the generalized uncertainty principle. Here, the effect of this quantum correction, described by the parameter γ, is considered on a toy model galaxy with dark matter and the three well‐known dark matter distributions: the cold dark matter, scalar field dark matter, and the universal rotation curve. The aim is to find constraints to γ by applying these solutions to the known supermassive black holes: Sagittarius A (Sgr. A*) and Messier 87* (M87*), in conjunction with the available Event Horizon telescope. The effect of γ is then examined on the event horizon, photonsphere, and shadow radii, where unique deviations from the Schwarzschild case are observed. As for the shadow radii, bounds are obtained for the values of γ on each black hole solution at 3σ confidence level. The results revealed that under minimal length scale effect, black holes can give positive (larger shadow) and negative values (smaller shadow) of γ, which are supported indirectly by laboratory experiments and astrophysical or cosmological observations, respectively.

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Dynamics and epicyclic motions of particles around the Schwarzschild–de Sitter black hole in perfect fluid dark matter

Cited by 57 publications

References 82 publications

Exploring millicharged dark matter components from the shadows

Exploring millicharged dark matter components from the shadows

Dynamics of Magnetized and Magnetically Charged Particles around Regular Nonminimal Magnetic Black Holes

Constraints via the Event Horizon Telescope for Black Hole Solutions with Dark Matter under the Generalized Uncertainty Principle Minimal Length Scale Effect

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