Shadow and weak deflection angle of extended uncertainty principle black hole surrounded with dark matter

Pantig, Reggie C.; Yu, Paul Kwong; Rodulfo, Emmanuel T.; Овгун, Али

doi:10.1016/j.aop.2021.168722

Cited by 70 publications

(30 citation statements)

References 105 publications

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“…Even if the dark matter mass is so large in comparison to the supermassive black hole, this seems to be the case as also reported in Refs. [12][13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, this theoretical study can be significant and timely. Also recently, there have been few studies of dark matter halo effects in a black hole on spiral galaxies [12][13][14][15][16][17][18][19][20][21][22][23][24], and excitement in dark matter research is further elevated due to important findings about the time evolution of the dark matter core as the unknown dark matter particles interact with baryonic matter [25].…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Pantig¹,

Овгун²

2022

Preprint

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“…[27,28] where the authors considered a perfect fluid dark matter. Dark matter toy models are also considered in studying its effect to the shadow [29,30], weak deflection angle [31,32], and the intensity of electromagnetic flux radiation [33]. Until recently, a method was formulated to extract a particular black hole metric combined with some known dark matter profiles, thus, modeling a realistic scenario of a supermassive black hole at the heart of a galaxy surrounded with dark matter [34].…”

Section: Introductionmentioning

confidence: 99%

“…With Xu et al formalism, these black hole-dark matter metrics are rather new and to the best of our knowledge, there are no existing studies on calculating its weak deflection angle. There are existing studies, however, about other black hole-dark matter models and the calculation of their weak deflection angle and gravitational lensing effects [28,31,32,94,[114][115][116][117].…”

Section: Introductionmentioning

confidence: 99%

Dark matter effect on the weak deflection angle by black holes at the center of Milky Way and M87 galaxies

Pantig,

Övgün

2022

Preprint

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In this paper, we investigated the effect of dark matter on the weak deflection angle by black holes at the galactic center. We consider three known dark matter density profiles such as the Cold Dark Matter (CDM), Scalar Field Dark Matter (SFDM), and the Universal Rotation Curve (URC) from the Burkert profile. To achieve this goal, we used how the positional angles are measured by Ishihara et al. method based on Gauss-Bonnet theorem (GBT) on the optical metric. With the help of the non-asymptotic form of the GBT, the longitudinal angle difference is also calculated. First, we find the emergence of apparent divergent terms on the said profiles, which indicates that the spacetime describing the black hole-dark matter combination is non-asymptotic. We showed that these apparent divergent terms vanish when the distance of the source and receiver are astronomically distant from the black hole. Using the current observational data in the Milky Way and M87 galaxies, we find interesting behaviors of how the weak deflection angle varies with the impact parameter, which gives us some hint on how dark matter interacts with the null particles for each dark matter density profile. We conclude that since these deviations are evident near the dark matter core radius, the weak deflection angle offers a better alternative for dark matter detection than using the deviation from the black hole shadow. With the DM profiles explored in this study, we find that SFDM is the most difficult to detect, while the easiest is the URC profile.

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Black Hole in Quantum Wave Dark Matter

Pantig

Овгун

2022

Fortschritte der Physik

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In this work, we explored the effect of the fuzzy dark matter (FDM) (or wave dark matter) halo on a supermassive black hole (SMBH). Such a dark matter introduces a soliton core density profile, and we treat it ideally as a spherical distribution that surrounds the SMBH located at its center. In this direction, we obtained a new metric due to the union of the black hole and dark matter spacetime geometries. We applied the solution to the two known SMBH ‐ Sgr. A* and M87* and used the empirical data for the shadow diameter by EHT to constrain the soliton core radius rnormalc$r_\text{c}$ given some values of the boson mass mnormalb$m_\text{b}$. Then, we examine the behavior of the shadow radius based on such constraints and relative to a static observer. We found that different shadow sizes are perceived at regions robsrc$r_\text{obs}>r_\text{c}$, and the deviation is greater for values mb<10−22$m_\text{b}<10^{-22}$ eV. Concerning the shadow behavior, we have also analyzed the effect of the soliton profile on the thin‐accretion disk. Soliton dark matter effects manifest through the varying luminosity near the event horizon. We also analyzed the weak deflection angle and the produced Einstein rings due to soliton effects. We found considerable deviation, better than the shadow size deviation, for the light source near the SMBH with impact parameters comparable to the soliton core. Our results suggest the possible experimental detection of soliton dark matter effects using an SMBH at the galactic centers.

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Shadow and weak deflection angle of extended uncertainty principle black hole surrounded with dark matter

Cited by 70 publications

References 105 publications

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

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

Dark matter effect on the weak deflection angle by black holes at the center of Milky Way and M87 galaxies

Black Hole in Quantum Wave Dark Matter

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