Article
Physics, Particles & Fields
Gustav Mogull, Jan Plefka, Jan Steinhoff
Summary: This study establishes a precise connection between scalar-graviton S-matrix elements and expectation values of operators in a worldline quantum field theory, both of which are used to describe the classical scattering of black holes. By introducing a new set of Feynman rules, the study obtains results related to three-body gravitational radiation and two-body deflection in black hole scattering events. Furthermore, the study reveals that the eikonal phase of a 2 -> 2 scalar S-matrix corresponds to the free energy of the worldline quantum field theory.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Cristian Erices, Pantelis Filis, Eleftherios Papantonopoulos
Summary: The study demonstrates the avoidance of the no-hair theorem in scalar-tensor theories with bimetric structure by introducing an electric charge, leading to black hole solutions with rich thermodynamic behavior. The interplay of stability and phase transitions between different black hole configurations resembles a solid-liquid-gas system, with an electric potential acting as pressure and a triple point where three phases coexist equally probable.
Article
Physics, Particles & Fields
Alex Davey, Oscar J. C. Dias, Paul Rodgers
Summary: The article investigates the phase diagram of solutions of the charged black hole bomb system, particularly focusing on static hairy black holes in the Einstein-Maxwell-Scalar theory. These hairy black holes have higher entropy and may serve as the endpoint of instabilities in the black hole bomb system, relating to boson stars in the theory.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Jie Jiang, Aofei Sang, Ming Zhang
Summary: This paper investigates the effects of quantum corrections of the Einstein-Maxwell theory on the first law of black hole thermodynamics. The results suggest that the first law might still hold in the effective region, even with the inclusion of higher-curvature terms and nonminimally coupled electromagnetic fields.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Guangzhou Guo, Peng Wang, Houwen Wu, Haitang Yang
Summary: This study investigates the time evolutions of charged scalar perturbations on the background of a charged hairy black hole. By analyzing the quasinormal modes extracted from the waveform of scalar perturbations, it is discovered that some quasinormal modes can be superradiantly amplified when trapped in a potential well between two potential peaks. These superradiant modes render the charged hairy black hole unstable against charged scalar perturbations.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Kun Meng, Xi-Long Fan, Song Li, Wen-Biao Han, Hongsheng Zhang
Summary: The deviation parameters of Johannsen black holes are constrained for the first time using observations of M87* and SgrA*, revealing their effects on the black hole shadow and accretion disk. Observations with higher sensitivities in the future can test the effects of these parameters.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Oscar J. C. Dias, Takaaki Ishii, Keiju Murata, Jorge E. Santos, Benson Way
Summary: We construct a cohomogeneity-1 helical black string in six-dimensional Einstein gravity originating from the superradiant instability of the Myers-Perry black string. The helical black string possesses helical isometries generated by linear combinations of time translation, shifts along the string, and rotation, which are individually broken by the superradiant instability. Despite the absence of momentum in the string direction, the helical black string exhibits nonzero horizon velocity.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Marco Astorino, Roberto Emparan, Adriano Vigano
Summary: This paper argues that expanding bubbles of nothing are a common feature in systems of black holes with multiple or non-spherical horizons. The authors provide explicit constructions in four and five dimensions to demonstrate this idea, showing that the geometries of expanding bubbles arise as a limit of static black hole binaries and black rings. They also discuss the possibility of similar constructions in higher dimensions, although numerical methods are often required. The paper concludes by suggesting that the Nariai solution can be understood as containing an expanding circular bubble of nothing.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Chaoxi Fang, Jie Jiang, Ming Zhang
Summary: In the generalized off-shell free energy landscape, black holes are considered as thermodynamic topological defects. The local topological properties are reflected by the winding numbers at the defects, while the global topological nature can be classified by the topological number which is the sum of all local winding numbers. The winding numbers can be calculated via the residues of isolated one-order pole points of characterized functions constructed from the off-shell free energy. The topologies of black holes can be divided into three classes with the topological numbers being -1, 0, and 1, respectively, consistent with the results obtained in [Phys. Rev. Lett. 129, 191101 (2022)] using the topological current method. Standard defect points, generation and annihilation points, and critical points can be distinguished by coefficients of the Laurent series of the off-shell characterized function at those singular points.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Lam Hui, Austin Joyce, Riccardo Penco, Luca Santoni, Adam R. Solomon
Summary: We study the near-zone symmetries of a massless scalar field on four-dimensional black hole backgrounds and provide a geometric understanding that unifies various recently discovered symmetries as part of an SO(4, 2) group. A subset of these symmetries corresponds to the static sector and leads to the ladder symmetries responsible for the vanishing of Love numbers. We compare different near-zone approximations in the literature for the Kerr case and focus on the implementation that retains the symmetries of the static limit. We also describe the relation to spin-1 and 2 perturbations.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Guangzhou Guo, Peng Wang, Houwen Wu, Haitang Yang
Summary: This study investigates the waveforms of time signals produced by scalar perturbations in static hairy black holes. The waveforms are influenced by a double-peak effective potential. When the distance between the peaks is large, a series of decaying echo pulses are generated. However, when the peaks are close, fewer echo signals and a slowly decaying sinusoid tail are observed.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Guangzhou Guo, Peng Wang, Houwen Wu, Haitang Yang
Summary: In this paper, scalarized rotating black holes are constructed within the framework of Einstein-Maxwell-scalar models. The presence of scalarized KN black holes is suppressed by the black hole spin, with a maximum spin threshold. Furthermore, the paper observes the existence of unstable and stable light rings on the equatorial plane in specific parameter regimes for scalarized KN black holes.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
Ricardo Monteiro, Donal O'Connell, David Peinador Veiga, Matteo Sergola
Summary: The study demonstrates that classical objects computed by massive three-point amplitudes in gauge theory and gravity are Newman-Penrose scalars in a split-signature spacetime. These three-point amplitudes can define real kinematics and the quantum state set up by the particle is a coherent state fully determined by the three-point amplitude.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
David Licht, Raimon Luna, Ryotaku Suzuki
Summary: We investigate the phase space of non-uniform black branes on oblique lattices with numerous dimensions. We discover the phase diagrams for various periodicities and angles, and identify the thermodynamically favored phases for each lattice configuration. In a specific range of angles, we observe the metastability of certain phases.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Particles & Fields
Ryotaku Suzuki, Shinya Tomizawa
Summary: This study constructs static solutions of non-extremal and squashed black holes using the large D effective theory approach, describing spherical black holes in a Kaluza-Klein spacetime with a compactified dimension. The asymptotic background and near-horizon geometry with a compactified dimension are analytically solved by the 1/D expansion. Additionally, the large D limit is shown to be applicable in solving non-trivial backgrounds with a compactified direction, leading to a first-order flow equation, and the extremal limit reproducibly produces known results.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Physics, Particles & Fields
Javlon Rayimbaev, Sanjar Shaymatov, Mubasher Jamil
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)
Correction
Physics, Particles & Fields
Sanjar Shaymatov, Bobomurat Ahmedov, Mubasher Jamil
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Particles & Fields
Sanjar Shaymatov, Bobomurat Ahmedov, Mubasher Jamil
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)
Article
Physics, Mathematical
Kimet Jusufi, Mustapha Azreg-Ainou, Mubasher Jamil, Tao Zhu
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)
Article
Astronomy & Astrophysics
Kimet Jusufi, Mustapha Azreg-Ainou, Mubasher Jamil, Emmanuel N. Saridakis
Summary: Using observations of the central black hole and stars, we extract constraints on Barrow entropy, finding an upper bound less strong than the Big Bang Nucleosynthesis but significantly stronger than late-time cosmological constraints.
Article
Astronomy & Astrophysics
Javlon Rayimbaev, Bushra Majeed, Mubasher Jamil, Kimet Jusufi, Anzhong Wang
Summary: In this article, we investigate the particle dynamics around a Bardeen-Kiselev black hole, including its geometrical properties, the dynamics of test particles, and the relationship with rotating Kerr black hole.
PHYSICS OF THE DARK UNIVERSE
(2022)
Article
Astronomy & Astrophysics
Kimet Jusufi, Mustapha Azreg-Ainou, Mubasher Jamil, Qiang Wu
Summary: This paper focuses on the relationship between quasinormal modes (QNMs) and a rotating black hole shadow, using the example of a quantum deformed Kerr black hole. The study shows that, in the eikonal limit, the real part of QNMs is related to the Keplerian frequency for equatorial orbits. The paper also explores the typical shadow radius, computes the corresponding modes, and investigates the thermodynamical stability of the quantum deformed Kerr black hole, as well as other astrophysical applications.
Article
Astronomy & Astrophysics
Javlon Rayimbaev, Ahmadjon Abdujabbarov, Mubasher Jamil, Wen-Biao Han, Malika Khudoyberdieva
Summary: This paper discusses the motion of various types of charged, magnetized, and neutral test particles near static and spherically symmetric electrically charged black holes in the Einstein-/Ether gravitational theory. The effects of the free parameters in the theory on particle motion in curved spacetime are analyzed, focusing on the stability of circular and radially varying orbits for different types of particles. The behavior of charged particle motion around black holes with a uniform magnetic field is investigated, and values of the parameters c13 and c14 are proposed to model astrophysical black holes based on the spin of Kerr black holes.
MODERN PHYSICS LETTERS A
(2022)
Article
Physics, Nuclear
Farruh Atamurotov, Mubasher Jamil, Kimet Jusufi
Summary: In this study, the optical properties of a renormalization group improved Schwarzschild black hole in a plasma medium are investigated. The deflection angle of light in the weak gravity regime is computed for uniform and non-uniform plasma media, revealing the modifications caused by the plasma medium. The effects of plasma media play an important role in the optical appearance of black holes.
Article
Physics, Particles & Fields
Kimet Jusufi, Salvatore Capozziello, Sebastian Bahamonde, Mubasher Jamil
Summary: We use observational data to constrain a black hole solution of extended teleparallel gravity models based on the S2 star orbiting the Galactic Center. We construct the shadow images of the Sgr A* black hole and find that the shadow radius increases with the parameter alpha. The observables, such as the deflection angle and angular diameter, are close to the Schwarzschild case. However, the electromagnetic intensity observed in the shadow images is smaller compared to General Relativity (GR), indicating differences in the Born-Infeld f(T) gravity.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
Kimet Jusufi, Saurabh Kumar, Mustapha Azreg-Ainou, Mubasher Jamil, Qiang Wu, Cosimo Bambi
Summary: In this study, we investigate the possibility of a wormhole as a candidate for the central object of Sgr A(star) and test this idea by constraining their geometry using the motion of S2 star and the reconstructed shadow images. We consider three wormhole models and find that they satisfy the flare out condition. We also explore the accretion of infalling gas model and study the accretion rate, electromagnetic radiation intensity, and shadow images.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Particles & Fields
Sanjar Shaymatov, Mubasher Jamil, Kimet Jusufi, Kazuharu Bamba
Summary: In this study, we investigate the dynamics of test particles around a magnetized Ernst black hole, taking into account its surrounding magnetic field. We find that the magnetic field has a significant impact on the radius of the innermost stable circular orbit (ISCO) and the epicyclic frequencies, especially for charged particles. By analyzing the astrophysical quasiperiodic oscillation (QPO) data of three microquasars, we determine the order of magnitude of the magnetic field.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Farruh Atamurotov, Kimet Jusufi, Mubasher Jamil, Ahmadjon Abdujabbarov, Mustapha Azreg-Ainou
Summary: This paper investigates the influence of axion-plasmon on the optical properties of Schwarzschild black hole. It is found that the size of the black hole shadow decreases with increasing axion-plasmon coupling, indicating changes in gravitational deflection angle and other properties.
Correction
Astronomy & Astrophysics
Cheng Liu, Tao Zhu, Qiang Wu, Kimet Jusufi, Mubasher Jamil, Mustapha Azreg-Ainou, Anzhong Wang
Article
Astronomy & Astrophysics
Kimet Jusufi, Mustapha Azreg-Ainou, Mubasher Jamil, Shao-Wen Wei, Qiang Wu, Anzhong Wang
Summary: This paper obtains an effective metric describing a regular and rotating magnetic black hole solution and studies various properties including BH shadow, QNMs, QPOs, and observational constraints on the EYM parameter. The study shows interesting correlations between the magnetic charge, shadow radius, and QNMs of scalar and electromagnetic fields, also distinguishing the rotating EYM black hole from the Kerr-Newman black hole.