Shadow and deflection angle of charged rotating black hole surrounded by perfect fluid dark matter

Atamurotov, Farruh; Papnoi, Uma; Jusufi, Kimet

doi:10.1088/1361-6382/ac3e76

Cited by 64 publications

(31 citation statements)

References 97 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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“…For these regular black holes they have observed a decrease in the emission energy rate with the electric as well as the magnetic charge of the black holes. In a recent work the emission energy rate for a charged rotating black hole surrounded by perfect fluid dark matter has been investigated by Atamurotov et al [67]. They have shown that for the increasing values of the perfect fluid dark matter parameter and charge of the black hole, this emission rate decreases.…”

Section: Introductionmentioning

confidence: 99%

Shadow and quasinormal modes of the Kerr–Newman–Kiselev–Letelier black hole

et al. 2022

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We investigate the null geodesics and the shadow cast by the Kerr–Newman–Kiselev–Letelier (KNKL) black hole for the equation of state parameter $$\omega _q=-2/3$$ ω q = - 2 / 3 and for different values of the spacetime parameters, including the quintessence parameter $$\gamma $$ γ , the cloud of string (CS) parameter b, the spin parameter a and the charge Q of the black hole. We notice that for the increasing values of the parameters $$\gamma $$ γ and b the size of the shadow of the KNKL black hole increases and consequently the strength of the gravitational field of the black hole increases. On the other hand with increase in the charge Q of the black hole the size of the shadow of the black hole decreases. Further with the increase in the values of the spin parameter a of the KNKL black hole, we see that the distortion of the shadow of the black hole becomes more prominent. Moreover we use the data released by the Event Horizon Telescope (EHT) collaboration, to restrict the parameters b and $$\gamma $$ γ for the KNKL black hole, using the shadow cast by the KNKL black hole. To this end, we also explore the relation between the typical shadow radius and the equatorial and polar quasinormal mods (QNMs) for the KNKL black hole and extend this correspondence to non-asymptotically flat spacetimes. We also study the emission energy rate from the KNKL black hole for the various spacetime parameters, and observe that it increases for the increasing values of both the parameters $$\gamma $$ γ and b for fixed charge-to-mass and spin-to-mass ratios of the KNKL black hole. Finally, we investigate the effects of plasma on the photon motion, size and shape of the shadow cast by the KNKL black hole. While keeping the spacetime parameters fixed, we notice that with increase in the strength of the plasma medium the size of the shadow of the KNKL black hole decreases and therefore the intensity of the gravitational field of the KNKL black hole decreases in the presence of plasma.

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“…Recent and related work for deflection angle caused by dark matter can be found in Refs. [43][44][45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

Dehnen halo effect on a black hole in an ultra-faint dwarf galaxy

Pantig¹,

Овгун²

2022

Preprint

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There had been recent advancement toward the detection of ultra-faint dwarf galaxies, which may serve as a useful laboratory for dark matter exploration since some of them contains almost 99% of pure dark matter. The majority of these galaxies contain no black hole that inhabits them. Recently, there had been reports that some dwarf galaxies may have a black hole within. In this study, we construct a black hole solution combined with the Dehnen dark matter halo profile, which is commonly used for dwarf galaxies. We aim to find out whether there would be deviations relative to the standard black hole properties which might allow determining whether the dark matter profile in ultra-faint dwarf galaxies is cored or cuspy. To make the model more realistic, we applied the modified Newman-Janis prescription to obtain the rotating metric. We analyzed the black hole properties such as the event horizon, ergoregion, geodesics of time-like and null particle, and the black hole shadow. To broaden the scope of this study, we also calculated the weak deflection angle to examine the effect of the Dehnen profile. Results revealed that the Dehnen profile causes some tiny but interesting deviations to the known black hole properties. It is shown that the radius of the innermost stable circular orbit decreases, while the photonsphere radius increases. We also found out that the size of the shadow decreases due to the Dehnen profile and the extent depends on whether the profile is cored or cuspy. Overall, the deviation caused by the Dehnen profile relative to the known black hole properties are so tiny, that one needs a very sophisticated and ultra-sensitive space detectors to help distinguish whether this profile for ultra-faint dwarf galaxy is cored or cuspy.

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Shadow and deflection angle of charged rotating black hole surrounded by perfect fluid dark matter

Cited by 64 publications

References 97 publications

Exploring millicharged dark matter components from the shadows

Exploring millicharged dark matter components from the shadows

Shadow and quasinormal modes of the Kerr–Newman–Kiselev–Letelier black hole

Dehnen halo effect on a black hole in an ultra-faint dwarf galaxy

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