Related references
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Article
Physics, Multidisciplinary
Reggie C. Pantig et al.
Summary: In this work, the researchers investigated the impact of fuzzy dark matter (FDM) or wave dark matter on a supermassive black hole (SMBH). By treating the FDM as a spherical distribution surrounding the SMBH, they obtained a new metric that combines the black hole and dark matter spacetime geometries. The study also analyzed the effects of soliton dark matter on the shadow behavior and weak deflection angle, and found considerable deviations that suggest the possible experimental detection of soliton dark matter using an SMBH at the galactic centers.
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(2023)
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Sunny Vagnozzi et al.
Summary: Horizon-scale images of black holes provide the opportunity to test gravity and fundamental physics in the strong-field regime. Using observations from the Event Horizon Telescope, we have narrowed down the possible deviations from classical general relativity solutions for black holes.
CLASSICAL AND QUANTUM GRAVITY
(2023)
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G. Mustafa et al.
Summary: In this article, the wormhole geometry in the galactic halo region under modified f(Q) gravity, especially symmetric teleparallel gravity, is studied. The wormhole solutions for the assumed form f(Q)=alpha Q+beta have been presented, where alpha and beta are the model parameters. Various features and behaviors of the model, such as energy conditions, wormhole solutions in the NFW density profiles, particles moving in closed orbits around the wormholes, and the red-blue shifts of light from the wormhole throat, have been elaborately shown through mathematical calculations and graphical plots.
FORTSCHRITTE DER PHYSIK-PROGRESS OF PHYSICS
(2023)
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Physics, Multidisciplinary
Yifan Chen et al.
Summary: Gravitational atoms produced by the superradiant extraction of spinning black holes' rotational energy have higher energy densities than dark matter, making black holes potential detectors for ultralight bosons. These structures are formed by coherently oscillating bosons, which cause oscillations in the metric perturbations, deflecting the paths of photons passing through them. The deviation of nearby geodesics can be further amplified near critical bound photon orbits. We discuss the possibility of detecting this deflection using photon ring autocorrelations with the Event Horizon Telescope and its next-generation upgrade, which can explore a large unexplored region of the cloud mass parameter space compared to previous constraints.
PHYSICAL REVIEW LETTERS
(2023)
Article
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Arshia Anjum et al.
Summary: In this paper, we study Kerr black holes surrounded by perfect dark fluid matter (PFDM) and analyze the effect of PFDM on photon orbits. We find that the azimuthal oscillations of photon boomerangs around rotating PFDM black holes behave differently for prograde and retrograde orbits. By using observational results from the Event Horizon Telescope (EHT), we obtain upper bounds on the PFDM parameter and conclude that rotating PFDM black holes could be strong candidates for astrophysical black holes.
PHYSICS OF THE DARK UNIVERSE
(2023)
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Reggie C. Pantig et al.
Summary: In this paper, the Poincare Gauge theory of gravity is used to analyze the effects of torsion on black holes by studying the deflection angles and shadow radius. The study also explores the impact of torsion on the luminosity of the photonsphere and other properties of black holes. The findings suggest that the torsion parameter plays a significant role in these phenomena.
Article
Physics, Particles & Fields
Gulzoda Rakhimova et al.
Summary: This paper focuses on studying the thermodynamics and particle acceleration around charged rotating black holes surrounded by perfect fluid dark matter. The effects of perfect fluid dark matter on thermodynamics, such as Hawking's temperature and Gibbs free energy, are discussed. The thermal fluctuations of the considered black hole solutions, which affect the entropy and Hawking radiation, are also investigated. The results suggest that the corrected thermodynamic quantities of charged rotating black holes with perfect fluid dark matter are smaller than those without it.
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Physics, Multidisciplinary
J. Aalbers et al.
Summary: The LUX-ZEPLIN experiment conducted a dark matter detection using a dual-phase xenon time projection chamber at the Sanford Underground Research Facility in Lead, South Dakota, USA. With a fiducial mass of 5.5 t and an exposure of 60 live days, it reported results showing consistency with a background-only hypothesis in the search for weakly interacting massive particles (WIMPs).
PHYSICAL REVIEW LETTERS
(2023)
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Physics, Particles & Fields
Gaetano Lambiase et al.
Summary: The study investigates the relationship between the deformation parameter beta of the generalized uncertainty principle (GUP) and the two free parameters (omega) over cap and gamma of the running Newtonian coupling constant of the Asymptotic Safe gravity (ASG) program. By analyzing the shadow and quasinormal modes of black holes, the results confirm the consistency of ASG and GUP, and provide new insights into the nature of black holes and their signatures. The implications of these findings for future studies in quantum gravity are also discussed.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Farruh Atamurotov et al.
Summary: We analyzed the shadow of a charged rotating black hole in the presence of perfect fluid dark matter and found that the size and shape of the shadow are affected by the dark matter parameter, charge, and rotation parameter. Additionally, we investigated the influence of these parameters on effective potential and energy emission, comparing the results to the non-rotating case in general relativity. We also explored the effect of dark matter on the deflection angle and size of Einstein rings.
CLASSICAL AND QUANTUM GRAVITY
(2022)
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Kimet Jusufi et al.
Summary: This paper investigates the effects of the Generalized Uncertainty Principle (GUP) on the shadow and quasinormal modes (QNMs) of GUP-modified Kerr black holes. The study reveals that the GUP modification increases the curvature radius of the shadow and that it increases linearly with the GUP parameter. By using observational data and fitting techniques, the upper limits of the GUP parameter and the correction parameter in the modified black hole metric are determined.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2022)
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Saurya Das et al.
Summary: The paper discusses the unexplained baryon asymmetry in the Universe and proposes a new explanation framework that satisfies the Sakharov conditions and introduces the Generalized Uncertainty Principle and holographic principle to address this issue.
Review
Physics, Multidisciplinary
Volker Perlick et al.
Summary: This article provides a review of current research on black hole shadows, with a focus on analytical studies. It discusses the definition of the shadow, derivation of angular size, and calculation methods under various conditions. Special attention is given to non-asymptotically flat spacetimes and the influence of plasma on black hole shadows.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2022)
Review
Physics, Nuclear
A. Addazi et al.
Summary: The exploration of the universe has entered a new era with the multi-messenger paradigm, providing us with more information about the universe and opening up the possibility of searching for quantum gravity phenomena.
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
(2022)
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Astronomy & Astrophysics
Jason T. Hinkle et al.
Summary: We present observations of ASASSN-20hx, a nearby ambiguous nuclear transient (ANT) discovered in NGC 6297. It lacks emission lines in both optical and near-infrared spectra, which is unusual for known classes of nuclear transients.
ASTROPHYSICAL JOURNAL
(2022)
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Astronomy & Astrophysics
R. A. Konoplya et al.
Summary: This study considers various profiles of matter distribution in galactic halos as the source term for the Einstein equations and finds exact solutions that represent the metric of a central black hole immersed in a galactic halo. Very accurate general analytical metrics, including all the particular models, are found in the astrophysically relevant regime.
ASTROPHYSICAL JOURNAL
(2022)
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Astronomy & Astrophysics
Reggie C. Pantig et al.
Summary: This study investigates the relationship between black holes and dark matter profiles in dwarf galaxies, finding that using the weak deflection angle can be far more effective in distinguishing between different profiles.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2022)
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Astronomy & Astrophysics
Pasquale Bosso et al.
Summary: This study investigates the implications of a phenomenological model of quantum gravitational effects associated with a minimal length. It derives a modified law of gravity through Verlinde's conjecture, utilizing the Bekenstein-Hawking entropy. The study explores the effects on galactic scales, particularly on the shape of rotational curves, and examines the potential to mimic dark matter-like effects using a minimal length.
FRONTIERS IN ASTRONOMY AND SPACE SCIENCES
(2022)
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Astronomy & Astrophysics
Gaetano Lambiase et al.
Summary: This paper presents a method to establish a relationship between the deformation parameter of the generalized uncertainty principle (GUP) and the free parameters of the asymptotically safe gravity program. By computing the Hawking temperature of a black hole through two different approaches, the authors derive a relation between the GUP parameter and the running Newtonian coupling constant.
Article
Astronomy & Astrophysics
Vitor Cardoso et al.
Summary: Fuzzy dark matter is an exciting alternative to the standard cold dark matter paradigm, and this study uses numerical relativity to investigate the process of a boson star being accreted by a black hole. The study identifies three stages in the accretion process and presents a general expression for the lifetime of a boson star with an endoparasitic black hole.
Article
Astronomy & Astrophysics
Petr Jizba et al.
Summary: This paper studies the observational effects of generalized uncertainty principle (GUP) systems in their decoherence domain. Coherent states associated with GUP are derived and shown to coincide with Tsallis probability amplitudes in the momentum representation, where the nonextensivity parameter q increases monotonically with the GUP deformation parameter α. Furthermore, for α < 0, the GUP is fully equivalent to information-theoretic uncertainty relations based on Tsallis entropy-power. The connection between the quasiclassical limit of GUP-related quantum theory and nonextensive thermostatistics of Tsallis is revealed using the maximal entropy principle from estimation theory.
Article
Physics, Particles & Fields
Reggie C. Pantig et al.
Summary: In this paper, the effect of dark matter on the weak deflection angle by black holes at the galactic center is investigated. Three known dark matter density profiles are considered and the positional angles are measured using the Ishihara et al. method. The emergence of apparent divergent terms on the dark matter profiles is found, but they vanish when the distance from the black hole is large. The weak deflection angle varies interestingly with the impact parameter, providing insights into the interaction between dark matter and null particles.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Anish Das et al.
Summary: In this study, a charged black hole solution in the presence of perfect fluid dark matter (PFDM) was obtained and its energy conditions were discussed. The corresponding rotating metric was obtained using the Newman-Janis algorithm, and circular geodesics were calculated to study the effects of black hole parameters on particle energy. The study also delved into the Penrose process and the potential existence of negative energy particles within the ergosphere.
CLASSICAL AND QUANTUM GRAVITY
(2021)
Article
Astronomy & Astrophysics
Vijay Nenmeli et al.
Summary: This study utilizes the Generalized Uncertainty Principle to model features of quantum gravity and explores the applications of Stelle gravity in cosmology. It shows that Stelle gravity can be considered as a classical manifestation of maximum momentum and the GUP. Strong constraints on the GUP parameter are obtained from CMB observations, providing both lower and upper bounds.
Article
Physics, Particles & Fields
Ozgur Okcu et al.
Summary: This paper discusses gravitational tests for the GUP modified Schwarzschild metric, including Shapiro time delay, gravitational redshift, and geodetic precession, and sets upper bounds for the GUP parameter beta based on Solar system experiments and observations. The paper also compares these bounds with others in the literature.
Article
Astronomy & Astrophysics
Sourabh Nampalliwar et al.
Summary: This paper investigates the impact of a dark matter spike on the vicinity of the black hole Sgr A* in the center of the Milky Way. The study examines the influence of dark matter density on the shadow radius and image of the black hole, concluding that the effect is weak for realistic densities but may become significant at higher densities near the black hole. However, simulations with radio interferometry, similar to an EHT array, suggest that detecting this effect in the near future is unlikely.
ASTROPHYSICAL JOURNAL
(2021)
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Physics, Particles & Fields
Javlon Rayimbaev et al.
Summary: This paper investigates circular orbits around a black hole surrounded by dark matter, showing how dark matter impacts the existence of circular orbits and exploring its applications in fitting and explaining black hole parameters.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
K. Saurabh et al.
Summary: Researchers studied the identification of dark matter in the galactic center by analyzing the physical properties of electromagnetic radiation emitted from an optically-thin disk region surrounding a static and spherically symmetric black hole. Dark matter can either increase or decrease the intensity of electromagnetic flux radiation depending on the model, with a high energy density of dark matter near the black hole needed for a significant effect. The distribution of surrounding dark matter plays a key role in the shadow radius and intensity of electromagnetic flux radiation.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Correction
Physics, Particles & Fields
Sanjar Shaymatov et al.
EUROPEAN PHYSICAL JOURNAL C
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Sanjar Shaymatov et al.
Summary: This study tests the weak cosmic censorship conjecture for the Reissner-Nordstrom-de Sitter black hole surrounded by perfect fluid dark matter, showing that even in a realistic scenario with cosmological parameters, the black hole cannot be overcharged unless the induced fields by dark matter and cosmological parameters are completely balanced. Additionally, it is found that a certain threshold limit exists beyond which the black hole cannot be overcharged, indicating that the effect of the cosmological constant dominates over the effect of perfect fluid dark matter in the overcharging process.
EUROPEAN PHYSICAL JOURNAL C
(2021)
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Zhaoyi Xu et al.
Summary: Research shows that dark matter spikes have a significantly higher impact on black holes compared to dark matter halos, potentially greatly increasing the chances of detecting dark matter signals near black holes, and thus providing the possibility to test dark matter models through gravitational wave and EHT observations.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
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Tian-Chi Ma et al.
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MODERN PHYSICS LETTERS A
(2021)
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Rahul Kumar et al.
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PHYSICS OF THE DARK UNIVERSE
(2021)
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Farruh Atamurotov et al.
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Saurya Das et al.
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