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Journal articles on the topic 'Black hole structure'

Author: Grafiati

Published: 10 December 2022

Last updated: 25 July 2025

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1

Kumar, Jitendra, Shafqat Ul Islam, and Sushant G. Ghosh. "Loop Quantum Gravity motivated multihorizon rotating black holes." Journal of Cosmology and Astroparticle Physics 2022, no. 11 (2022): 032. http://dx.doi.org/10.1088/1475-7516/2022/11/032.

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Abstract With a semiclassical polymerization in the loop quantum gravity (LQG), the interior of the Schwarzschild black holes provides a captivating single-horizon regular black hole spacetime. The shortage of rotating black hole models in loop quantum gravity (LQG) substantially restrains the progress of testing LQG from observations. Motivated by this, starting with a spherical LQG black hole as a seed metric, we construct a rotating spacetime using the revised Newman-Janis algorithm, namely, the LQG-motivated rotating black holes (LMRBH), which encompasses Kerr (l = 0) black holes as an exc

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Mahulikar, Shripad P., and Pallavi Rastogi. "Study of black hole as dissipative structure using negentropy." Canadian Journal of Physics 94, no. 10 (2016): 960–66. http://dx.doi.org/10.1139/cjp-2016-0388.

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The area of the event horizon of a black hole (Aeh) is so far linked only with its entropy (SBH). In this theoretical investigation, it is shown that relating Aeh only to SBH is inadequate, because Aeh is linked to the black hole’s negentropy, which encompasses its entropy. Increasing Aeh of black holes that grow now follows from the negentropy theorem (NET) and also from the well-known area theorem. The decreasing Aeh of black holes that decay follows from the converse to NET and is not a violation of the area theorem. The corollary to NET is proved for the case when two dissipative structure

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3

Ghosh, P. "The structure of black hole magnetospheres -- I. Schwarzschild black holes." Monthly Notices of the Royal Astronomical Society 315, no. 1 (2000): 89–97. http://dx.doi.org/10.1046/j.1365-8711.2000.03410.x.

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4

Luo, Weichen. "The Impact of Super Massive Black Hole (SMBH) on Galaxy and Star." Highlights in Science, Engineering and Technology 38 (March 16, 2023): 383–90. http://dx.doi.org/10.54097/hset.v38i.5840.

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Black hole, one of the most inscrutable objects in the universe have been confirmed that nearly every galaxy contain a super massive black hole (SMBH) at its centre. SMBH’s mass is astounding high which contains millions of solar masses, such huge black hole will generate huge gravitational effect on the region nearby. However, studies indeed found the correlation between black hole and its host galaxy. This paper investigates the impact of black holes on galaxies’ structure and stars based on different black hole mass relation simulations. The exact effects on black holes on galaxies remain u

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CHAKRABARTI, SAYAN K., KUMAR S. GUPTA, and SIDDHARTHA SEN. "UNIVERSAL NEAR-HORIZON CONFORMAL STRUCTURE AND BLACK HOLE ENTROPY." International Journal of Modern Physics A 23, no. 16n17 (2008): 2547–61. http://dx.doi.org/10.1142/s0217751x08040482.

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It is shown that a massless scalar probe reveals a universal near-horizon conformal structure for a wide class of black holes, including the BTZ. The central charge of the corresponding Virasoro algebra contains information about the black hole. With a suitable quantization condition on the central charge, the CFT associated with the black hole in our approach is consistent with the recent observation of Witten, where the dual theory for the BTZ in the AdS/CFT framework has been identified with the construction of Frenkel, Lepowsky and Meurman. This CFT admits the Fischer–Griess monster group

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Shi, Yuanyuan, Ziyi Liu, Qiyuan Fan, Xiao Wang, Qibai Huang, and Jiangying Peng. "Dynamic Modeling and Modal Analysis of Rectangular Plates with Edge Symmetric Periodic Acoustic Black Holes." Symmetry 17, no. 7 (2025): 1031. https://doi.org/10.3390/sym17071031.

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The vibration noise of plate structures in engineering is strongly related to the modal resonance, and modal design is the key to improve the dynamic characteristics of plate structures and avoid structural resonance. This paper investigates the dynamic and mode characteristics for an edge periodic acoustic black hole plate structure to provide a new approach to vibration and sound attenuation in plate structures. Firstly, based on the principles of symmetry and periodicity, this work presents the geometrical modeling and mathematical description of a rectangular plate with symmetrical periodi

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Deng, Gao-Ming, та Yong-Chang Huang. "Q − Φ criticality and microstructure of charged AdS black holes in f(R) gravity". International Journal of Modern Physics A 32, № 35 (2017): 1750204. http://dx.doi.org/10.1142/s0217751x17502049.

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The phase transition and critical behaviors of charged AdS black holes in [Formula: see text] gravity with a conformally invariant Maxwell (CIM) source and constant curvature are further investigated. As a highlight, this research is carried out by employing new state parameters [Formula: see text] and contributes to deeper understanding of the thermodynamics and phase structure of black holes. Our analyses manifest that the charged [Formula: see text]-CIM AdS black hole undergoes a first-order small–large black hole phase transition, and the critical behaviors qualitatively behave like a Van

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8

Gao, Shengyao, Zhou Tao, Yuhui Li, and Fuzhen Pang. "Application research of acoustic black hole in floating raft vibration isolation system." REVIEWS ON ADVANCED MATERIALS SCIENCE 61, no. 1 (2022): 888–900. http://dx.doi.org/10.1515/rams-2022-0235.

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Abstract Acoustic black holes have good application prospects in the field of vibration and noise reduction. Based on engineering practice, this study proposes a systematic process method for the application of acoustic black hole structure in raft structure, which provides new ideas and references for improving the vibration isolation performance of floating raft system and reducing the level of ship vibration and noise. The influence law of each parameter on structural vibration and the recommended value range of each parameter are given, which provides support for the systematic method and

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9

Nagatani, Yukinori. "Atomic Structure in Black Hole." Progress of Theoretical Physics Supplement 164 (2006): 54–67. http://dx.doi.org/10.1143/ptps.164.54.

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10

Tang, Yang, Jiangtao Liu, Ning Liu, Fuzhen Pang, and Yu Wang. "Dynamic characteristic analysis of acoustic black hole in typical raft structure." REVIEWS ON ADVANCED MATERIALS SCIENCE 61, no. 1 (2022): 458–76. http://dx.doi.org/10.1515/rams-2022-0038.

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Abstract As a hot content of research in recent years, acoustic black holes have bright application prospects in the field of vibration and noise reduction. In this article, based on the acoustic black hole theory, we carry out a study on the dynamic characteristics of a typical raft structure. The manuscript gives the simplified method of the acoustic black hole model, verifies the validity of the method by the structure natural frequency and vibration response, and discusses the influence of the main parameters such as acoustic black hole tip cutoff ratio and damping thickness ratio on the v

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11

HONG, SUNGWOOK E., DONG-HAN YEOM, and HEESEUNG ZOE. "CRITICAL REVIEWS ON HOLOGRAPHIC MEASURE OVER THE MULTIVERSE." International Journal of Modern Physics: Conference Series 01 (January 2011): 317–22. http://dx.doi.org/10.1142/s2010194511000468.

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In this talk, the holographic measure based on black hole complementarity is critically reviewed. By noticing the similarities between the causal structure of an inflationary dS space and that of a black hole, we have considered the complementarity principle between the inside and the outside of the causal horizon as an attractive way to count the inflationary multiverse. Even though the holographic measure relieves the Boltzmann brain problem and stresses the physical reality based on observations, it could be challenged by the construction of counterexamples, both on regular black holes and

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Macedo, Caio F. B., João Luís Rosa, and Diego Rubiera-Garcia. "Optical appearance of black holes surrounded by a dark matter halo." Journal of Cosmology and Astroparticle Physics 2024, no. 07 (2024): 046. http://dx.doi.org/10.1088/1475-7516/2024/07/046.

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Abstract Black holes in General Relativity are described by space-time metrics that are simpler in comparison to non-vacuum compact objects. However, given the universality of the gravitational pull, it is expected that dark matter accumulates around astrophysical black holes, which can have an impact in the overall gravitational field, especially at galactic centers, and induce non-negligible effects in their observational imprints. In this work, we study the optical appearance of a spherically symmetric black hole both when orbited by isotropically emitting light sources and when surrounded

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Fontana, Rodrigo Dal Bosco. "Lower Dimensional Black Holes in Nonlinear Electrodynamics: Causal Structure and Scalar Perturbations." Universe 11, no. 6 (2025): 197. https://doi.org/10.3390/universe11060197.

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We study the charged black-hole solutions of a 2 + 1 nonlinear electrodynamical theory with a cosmological constant. Considered as a one-parameter group of theories (the exponent of the squared Maxwell tensor), the causal structure of all possible black holes is scrutinized. We analyze the singularity character that each theory delivers, together with their horizons and the plausible limitations in black-hole charges. The investigation demonstrates a rich structure of three different groups of theories according to the qualitative behavior of the singularity, horizons and limitations in the ge

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Pesce, Dominic W., Daniel C. M. Palumbo, Angelo Ricarte, et al. "Expectations for Horizon-Scale Supermassive Black Hole Population Studies with the ngEHT." Galaxies 10, no. 6 (2022): 109. http://dx.doi.org/10.3390/galaxies10060109.

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We present estimates for the number of supermassive black holes (SMBHs) for which the next-generation Event Horizon Telescope (ngEHT) can identify the black hole “shadow”, along with estimates for how many black hole masses and spins the ngEHT can expect to constrain using measurements of horizon-resolved emission structure. Building on prior theoretical studies of SMBH accretion flows and analyses carried out by the Event Horizon Telescope (EHT) collaboration, we construct a simple geometric model for the polarized emission structure around a black hole, and we associate parameters of this mo

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15

Jiang, Hong-Xuan, Indu K. Dihingia, Cheng Liu, Yosuke Mizuno, and Tao Zhu. "Enhanced Blandford Znajek jet in loop quantum black hole." Journal of Cosmology and Astroparticle Physics 2024, no. 05 (2024): 101. http://dx.doi.org/10.1088/1475-7516/2024/05/101.

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Abstract The Blandford-Znajek (BZ) process powers energetic jets by extracting the rotating energy of a Kerr black hole. It is important to understand this process in non-Kerr black hole spacetimes. In this study, we conduct two-dimensional and three-dimensional two-temperature General Relativistic Magnetohydrodynamic (GRMHD) simulations of magnetized accretion flows onto a rotating Loop-Quantum black hole (LQBH). Our investigation focuses on the accretion flow structure and jet launching dynamics from our simulations. We observe that the loop quantum effects increase the black hole angular fr

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16

Naveena Kumara, A., Shreyas Punacha, and Md Sabir Ali. "Lyapunov exponents and phase structure of Lifshitz and hyperscaling violating black holes." Journal of Cosmology and Astroparticle Physics 2024, no. 07 (2024): 061. http://dx.doi.org/10.1088/1475-7516/2024/07/061.

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Abstract We study the phase structure of Lifshitz and hyperscaling violating (HSV) black holes using Lyapunov exponents. For describing hyperscaling violating system, we chose a particular gravity model constructed from generalized Einstein-Maxwell-Dilaton action which includes the Lifshitz cases at appropriate limits. We study the relationship between Lyapunov exponents and black hole phase transitions considering both the timelike and null geodesics. We observe that, the black hole phase transiton properties are reflected in Lyapunov exponent where its multiple branches correspond to the dis

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17

Khan, Muhammad Atif, Farhad Ali, Nahid Fatima, and Mohamed Abd El-Moneam. "Particles Dynamics in Schwarzschild like Black Hole with Time Contracting Horizon." Axioms 12, no. 1 (2022): 34. http://dx.doi.org/10.3390/axioms12010034.

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The black holes radiate their mass and energy in the form of gravitational waves and Hawking-radiation, which lead to a decrease in the mass and energy of the black holes. During the formation of gravitational waves and Hawking radiation, the mass and energy of black holes reduce continuously with the passage of time t. For this reason the metric tensor of the black hole should depends on time t. In this work, a time-dependent term is introduced in the horizon of black hole without losing its symmetry structure by using the approximate Noether symmetry equation. The time-dependent term affects

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18

Deng, Pingsong, and Yiqiang Zhang. "Exploring The Formation and Dynamics of Black Holes." Highlights in Science, Engineering and Technology 112 (August 20, 2024): 332–36. http://dx.doi.org/10.54097/2n7y2p36.

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Black holes, created by the collapse of massive stars, are one of the most mysterious phenomena in astrophysics. Understanding their formation and behavior is crucial to understanding the evolution and structure of the universe. However, significant gaps remain in the understanding of their origins and characteristics. This study delves into the complexities of black hole formation, dynamics, and classification, aiming to unravel the mysteries surrounding these cosmic entities. This article uses a combination of the theoretical framework of general relativity and numerical simulation. The stud

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Bronnikov, Kirill A., Júlio C. Fabris, and Denis C. Rodrigues. "On black hole structures in scalar–tensor theories of gravity." International Journal of Modern Physics D 25, no. 09 (2016): 1641005. http://dx.doi.org/10.1142/s0218271816410054.

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We review some properties of black hole structures appearing in gravity with a massless scalar field, with both minimal and nonminimal coupling. The main properties of the resulting cold black holes are described. The study of black holes in scalar-gravity systems is extended to [Formula: see text]-essence theories, and some examples are explicitly worked out. In these cases, even while the existence of horizons is possible, the metric regularity requirement on the horizon implies either a cold black type structure or a singular behavior of the scalar field.

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20

Inbarani, Hannah H., Ahmad Taher Azar, and Bagyamathi Mathiyazhagan. "Hybrid Rough Set With Black Hole Optimization-Based Feature Selection Algorithm for Protein Structure Prediction." International Journal of Sociotechnology and Knowledge Development 14, no. 1 (2022): 1–45. http://dx.doi.org/10.4018/ijskd.290657.

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In this paper, a new approach for hybridizing Rough Set Quick Reduct and Relative Reduct approaches with Black Hole optimization algorithm is proposed. This algorithm is inspired of black holes. A black hole is a region of spacetime where the gravitational field is so strong that nothing— not even light— that enters this region can ever escape from it. Every black hole has a mass and charge. In this Algorithm, each solution of problem is considered as a black hole and gravity force is used for global search and the electrical force is used for local search. The proposed algorithm is compared w

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21

Shibata, K., S. Koide, T. Kudoh, and S. Aoki. "Jets from Black Hole Magnetospheres." Symposium - International Astronomical Union 195 (2000): 265–72. http://dx.doi.org/10.1017/s0074180900163028.

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Recent general-relativistic MHD simulations of jets ejected from black-hole magnetospheres (for both Schwarzschild and Kerr holes) have revealed that (1) strong shock waves are formed in the accretion flow inside 3rs, (2) jets show two-layered shell structure consisting of a gas-pressure driven jet and a magnetically driven jet, the former being accelerated from a high-pressure region heated by strong shocks, and (3) in the case of a Kerr hole, magnetically driven jets are produced from the ergosphere by the effect of frame dragging.

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BYTSENKO, A. A., E. ELIZALDE, and S. A. SUKHANOV. "HYPERBOLIC TOPOLOGICAL INVARIANTS AND THE BLACK HOLE GEOMETRY." International Journal of Modern Physics A 17, no. 29 (2002): 4167–76. http://dx.doi.org/10.1142/s0217751x02013198.

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23

Afrin, Misba, and Sushant G. Ghosh. "Estimating the Cosmological Constant from Shadows of Kerr–de Sitter Black Holes." Universe 8, no. 1 (2022): 52. http://dx.doi.org/10.3390/universe8010052.

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The Event Horizon Telescope collaboration has revealed the first direct image of a black hole, as per the shadow of a Kerr black hole of general relativity. However, other Kerr-like rotating black holes of modified gravity theories cannot be ignored, and they are essential as they offer an arena in which these theories can be tested through astrophysical observation. This motivates us to investigate asymptotically de Sitter rotating black holes wherein interpreting the cosmological constant Λ as the vacuum energy leads to a deformation in the vicinity of a black hole—new Kerr–de Sitter solutio

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24

Hua, Dejia, Yikun Liang, Mocheng Zhang, and Mengyang Zhu. "Properties and Observations of Black Bole Jets Based on the State-of-art Facilities." Highlights in Science, Engineering and Technology 72 (December 15, 2023): 1353–61. http://dx.doi.org/10.54097/67cmev65.

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The research on black hole jets started way back in the 1970s. From the first hypotheses that question the center of a galaxy, to nowadays’ detailed structure of active galactic nuclei, the research on black hole jets has progressed immensely. This study is dedicated to summarizing all aspects of black hole jet research. This includes its research history, background information, theorems, properties, simulations, possible future research, and limitations on current research. Various papers are cited, including ones published as early as the 1980s, and current ones, to give a full view of blac

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YOUM, DONAM. "BRANE WORLD IN A TOPOLOGICAL BLACK HOLES IN ASYMPTOTICALLY FLAT SPACE–TIME." Modern Physics Letters A 16, no. 26 (2001): 1703–10. http://dx.doi.org/10.1142/s0217732301005035.

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We study static brane configurations in the bulk background of the topological black holes in asymptotically flat space–time and find that such configurations are possible even for flat black hole horizon, unlike the AdS black hole case. We construct the brane world model with an orbifold structure S1/Z2 in such bulk background and study massless bulk scalar field.

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DeGraf, C., and D. Sijacki. "Cosmological simulations of massive black hole seeds: predictions for next-generation electromagnetic and gravitational wave observations." Monthly Notices of the Royal Astronomical Society 491, no. 4 (2019): 4973–92. http://dx.doi.org/10.1093/mnras/stz3309.

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ABSTRACT We study how statistical properties of supermassive black holes depend on the frequency and conditions for massive seed formation in cosmological simulations of structure formation. We develop a novel method to recalculate detailed growth histories and merger trees of black holes within the framework of the Illustris simulation for several seed formation models, including a physically motivated model where black hole seeds only form in progenitor galaxies that conform to the conditions for direct collapse black hole formation. While all seed models considered here are in a broad agree

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López, Diego F., Salman Abarghouei Nejad, and José G. Pereira. "De Sitter-Invariant Black Holes." Universe 9, no. 7 (2023): 333. http://dx.doi.org/10.3390/universe9070333.

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In the de Sitter-invariant approach to gravitation, all solutions to the gravitational field equations are spacetimes that reduce locally to de Sitter. Consequently, besides including a Schwarzschild event horizon, the de Sitter-invariant black hole also has a de Sitter cosmic horizon. Accordingly, it can lodge matter and dark energies. Owing to this additional structure concerning Poincaré-invariant general relativity, such a black hole can establish a link between the black hole dynamics and the universe’s evolution. Possible implications for cosmology are discussed, and a comparison with re

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Reynolds, Christopher S. "Observational Constraints on Black Hole Spin." Annual Review of Astronomy and Astrophysics 59, no. 1 (2021): 117–54. http://dx.doi.org/10.1146/annurev-astro-112420-035022.

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The spin of a black hole is an important quantity to study, providing a window into the processes by which a black hole was born and grew. Furthermore, spin can be a potent energy source for powering relativistic jets and energetic particle acceleration. In this review, I describe the techniques currently used to detect and measure the spins of black holes. It is shown that: ▪ Two well-understood techniques, X-ray reflection spectroscopy and thermal continuum fitting, can be used to measure the spins of black holes that are accreting at moderate rates. There is a rich set of other electromagne

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Nasution, Budiman, Winsyahputra Ritonga, Ruben Cornelius Siagian, et al. "Physics Visualization of Schwarzschild Black Hole through Graphic Representation of the Regge-Wheeler Equation using R-Studio Approach." Sainmatika: Jurnal Ilmiah Matematika dan Ilmu Pengetahuan Alam 20, no. 1 (2023): 8–24. http://dx.doi.org/10.31851/sainmatika.v20i1.11845.

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This study aims to visualize the vibrations of black holes using the Regge-Wheeler equation in Cartesian coordinates. Black holes are astrophysical objects with extremely strong gravity, and understanding the vibrations around them provides insights into the nature and structure of black holes. The Regge-Wheeler equation is used to model these vibrations. In this study, the goal is to generate visual images that visualize the vibrations of black holes, including their frequencies, amplitudes, and possible vibration modes. Complex mathematical and computational methods were employed to create t

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Yang, Zhengping. "The State-of-art Theorem and Detection Paradigms of Black Holes." Theoretical and Natural Science 2, no. 1 (2023): 1–6. http://dx.doi.org/10.54254/2753-8818/2/20220178.

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The black hole has been a mystery and a source of detection motivation for the human race ever since our quest of the discovery and research of other space. In general, the black hole can be defined as a special time-space structure where the gravity is strong enough to trap the photons, i.e., the light will be unable to penetrate or escape from it. In this paper, the current theorem and state-of-art detection paradigms are discussed in detail. Primarily, the categories of the black holes are demonstrated. The four different types of black holes all present their unique features. the quest for

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NIELSEN, ALEX B., and DONG-HAN YEOM. "SPHERICALLY SYMMETRIC TRAPPING HORIZONS, THE MISNER–SHARP MASS AND BLACK HOLE EVAPORATION." International Journal of Modern Physics A 24, no. 28n29 (2009): 5261–85. http://dx.doi.org/10.1142/s0217751x09045984.

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We discuss some of the issues relating to information loss and black hole thermodynamics in the light of recent work on local black hole horizons. Understood in terms of pure states evolving into mixed states, the possibility of information loss in black holes is closely related to the global causal structure of space–time, as is the existence of event horizons. However, black holes need not be defined by event horizons, and in fact we argue that in order to have a fully unitary evolution for black holes, they should be defined in terms of something else, such as a trapping horizon. The Misner

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Poisson, E., and W. Israel. "Structure of the black hole nucleus." Classical and Quantum Gravity 5, no. 12 (1988): L201—L205. http://dx.doi.org/10.1088/0264-9381/5/12/002.

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Narzilloev, Bakhtiyor, and Bobomurat Ahmedov. "Observational and Energetic Properties of Astrophysical and Galactic Black Holes." Symmetry 15, no. 2 (2023): 293. http://dx.doi.org/10.3390/sym15020293.

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The work reviews the investigation of electromagnetic, optical, and energetic properties of astrophysical and galactic black holes and surrounding matter. The astrophysical applications of the theoretical models of black hole environment to the description of various observed phenomena, such as cosmic rays of the ultra-high-energy, black hole shadow, gravitational lensing, quasinormal modes, jets showing relativistic effects such as the Doppler beaming, thermal radiation from the accretion discs, quasiperiodic oscillations are discussed. It has been demonstrated that the observational data str

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FERNANDO, SHARMANTHIE, and FREYDOON MANSOURI. "THE STRUCTURE OF ADS BLACK HOLES AND CHERN–SIMONS THEORY IN 2 + 1 DIMENSIONS." International Journal of Modern Physics A 14, no. 04 (1999): 505–20. http://dx.doi.org/10.1142/s0217751x99000257.

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We study anti-de Sitter black holes in 2 + 1 dimensions in terms of Chern–Simons gauge theory of the anti-de Sitter group coupled to a source. Taking the source to be an anti-de Sitter state specified by its Casimir invariants, we show how all the relevant features of the black hole are accounted for. The requirement that the source be a unitary representation leads to a discrete tower of excited states which provide a microscopic model for the black hole.

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Bozza, Valerio. "Gravitational lensing by black holes and their alternatives." International Journal of Modern Physics D 26, no. 05 (2017): 1741013. http://dx.doi.org/10.1142/s0218271817410139.

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Black holes have the ability to generate infinite number of images of any given source. These relativistic images are formed by light rays winding around the black hole several times. The phenomenology associated with these images is very rich, since these features are very sensitive to the metric structure of the black hole. Here, we review some aspects of gravitational lensing by black holes and consider some fundamental aspects related to alternative solutions, which do not reproduce Schwarzschild in the asymptotic limit and are supported by exotic matter.

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Lustosa, F. B., Milko Estrada, M. S. Cunha, and C. R. Muniz. "Black holes inside cosmic voids." Journal of Cosmology and Astroparticle Physics 2025, no. 05 (2025): 052. https://doi.org/10.1088/1475-7516/2025/05/052.

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Abstract This study examines the gravitational and thermodynamic properties of static, spherically symmetric black holes within cosmic voids — vast underdense regions of the universe. By deriving a novel solution based on a universal density profile for voids, we analyze its spacetime structure, which reveals two horizons: one of the black hole and the other related to the de Sitter-like behavior. As the void approaches a perfect vacuum, the black hole horizon diminishes, tending to that of the Schwarzschild solution, while the outer horizon increases. We also study the solution stability via

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Zhu, Zixuan. "Analysis of black hole merger in AGNs." Theoretical and Natural Science 10, no. 1 (2023): 235–40. http://dx.doi.org/10.54254/2753-8818/10/20230350.

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In recent years, the phenomenon of black hole fusion in AGNs is a direction that cosmologists focus on at present. On this basis, this study will present an overall analysis of black holes mergers in AGNs. To be specific, this paper will first introduce some basic rules observed during black hole fusion. Secondly, a brief overview of black hole fusion in AGNs is given. Subsequently, the gravitational wave device (LIGO) used to detect BHs fusion is introduced in more illustration, and some relevant data on its measurement accuracy, its structure and related uses are given. After that, the autho

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Lu, Ru-Sen, Keiichi Asada, Thomas P. Krichbaum, et al. "A ring-like accretion structure in M87 connecting its black hole and jet." Nature 616, no. 7958 (2023): 686–90. http://dx.doi.org/10.1038/s41586-023-05843-w.

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AbstractThe nearby radio galaxy M87 is a prime target for studying black hole accretion and jet formation1,2. Event Horizon Telescope observations of M87 in 2017, at a wavelength of 1.3 mm, revealed a ring-like structure, which was interpreted as gravitationally lensed emission around a central black hole3. Here we report images of M87 obtained in 2018, at a wavelength of 3.5 mm, showing that the compact radio core is spatially resolved. High-resolution imaging shows a ring-like structure of $${8.4}_{-1.1}^{+0.5}$$ 8.4 − 1.1 + 0.5 Schwarzschild radii in diameter, approximately 50% larger than

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Afrin, Misba, Rahul Kumar, and Sushant G. Ghosh. "Parameter estimation of hairy Kerr black holes from its shadow and constraints from M87*." Monthly Notices of the Royal Astronomical Society 504, no. 4 (2021): 5927–40. http://dx.doi.org/10.1093/mnras/stab1260.

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ABSTRACT The recently obtained hairy Kerr black holes, due to additional sources or surrounding fluid, like dark matter, with conserved energy-momentum tensor, have a deviation α and primary hair l0, apart from rotation parameter a and mass M. In the wake of the Event Horizon Telescope (EHT) observations of the supermassive black hole M87*, a recent surge in interest in black hole shadows suggests comparing the black holes in general relativity and modified theories of gravity to assess these models’ differences. Motivated by this, we take on an extensive study of the rotating hairy Kerr black

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Mou, Pinghui, Zhengzhou Yan, and Guoping Li. "Thermodynamics and Phase Transitions of Dyonic AdS Black Holes in Gauss-Bonnet-Scalar Gravity." Universe 10, no. 2 (2024): 87. http://dx.doi.org/10.3390/universe10020087.

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In this paper, by treating the cosmological constant as a thermodynamic pressure, we study the thermodynamics and phase transitions of the dyonic AdS black holes in Gauss-Bonnet-Scalar gravity, where the conformal scalar field is considered. In a more general extended phase space, we first verified the first law of black hole thermodynamics, and find that it is always true. Meanwhile, the corresponding Smarr relation is also obtained. Then, we found that this black hole exhibits interesting critical behaviors in six dimensions, i.e., two swallowtails can be observed simultaneously. Interesting

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Saghafi, Sara, and Kourosh Nozari. "Black hole thermodynamics in Snyder phase space." International Journal of Geometric Methods in Modern Physics 14, no. 11 (2017): 1750164. http://dx.doi.org/10.1142/s021988781750164x.

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By defining a noncommutative symplectic structure, we study thermodynamics of Schwarzschild black hole in a Snyder noncommutative phase space for the first time. Since natural cutoffs are the results of compactness of symplectic manifolds in phase space, the physics of black holes in such a space would be affected mainly by these cutoffs. In this respect, this study provides a basis for more deeper understanding of the black hole thermodynamics in a pure mathematical viewpoint.

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Deng, Gao-Ming, Jinbo Fan, and Xinfei Li. "Effects of global monopole on critical behaviors and microstructure of charged AdS black holes." Modern Physics Letters A 36, no. 26 (2021): 2150191. http://dx.doi.org/10.1142/s0217732321501911.

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As an intriguing topological defect, global monopole’s influence on behaviors of black holes has always been anticipated but still remains obscure. Analyzing the thermodynamics of charged Anti-de Sitter (AdS) black hole incorporating a global monopole manifests that the black hole undergoes a Van der Waals-like first-order phase transition near the critical point. This paper concentrates on further investigating the transition, aiming at clarifying how the global monopole affects the criticality and microstructure of the charged AdS black holes. As a highlight, this research is implemented by

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Davis, Benjamin L., and Zehao 泽灏 Jin 金. "Discovery of a Planar Black Hole Mass Scaling Relation for Spiral Galaxies." Astrophysical Journal Letters 956, no. 1 (2023): L22. http://dx.doi.org/10.3847/2041-8213/acfa98.

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Abstract Supermassive black holes (SMBHs) are tiny in comparison to the galaxies they inhabit, yet they manage to influence and coevolve along with their hosts. Evidence of this mutual development is observed in the structure and dynamics of galaxies and their correlations with black hole mass (M •). For our study, we focus on relative parameters that are unique to only disk galaxies. As such, we quantify the structure of spiral galaxies via their logarithmic spiral-arm pitch angles (ϕ) and their dynamics through the maximum rotational velocities of their galactic disks (v max). In the past, w

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Casse, Fabien, Peggy Varniere, Léna Arthur, and Fabrice Dodu. "Sculpting the outer edge of accretion discs in pre-circumbinary binary black hole systems." Astronomy & Astrophysics, April 23, 2025. https://doi.org/10.1051/0004-6361/202453586.

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Binary black hole (BBH) systems have become a vivid reality in astrophysics as stellar-mass black hole mergers can now be detected through their related gravitational wave emission during the merger stage. While there have been a number of recent studies dedicated to the last stages of BBHs, where black holes are surrounded by a circumbinary disc (CBD), the structure of these systems prior to the formation of the CBD remains mostly unexplored. The aim of this paper is to investigate the potential modifications induced by the presence of a secondary black hole onto the structure of the accretio

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Kim, Sun-Yong, and Dooho Lee. "Numerical simulation of characteristics of wave propagation and reflection coefficient in a helix-acoustic black hole." Journal of Vibration and Control, December 21, 2020, 107754632098057. http://dx.doi.org/10.1177/1077546320980570.

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A new type of the acoustic black hole beam—a helix-acoustic black hole—is proposed to overcome the spatial restriction on modular acoustic black hole structures. The modular acoustic black hole structure, consisted of a base and several number of acoustic black hole beams, has potential to apply into real engineering world. There are two main sections in an acoustic black hole beam: (1) a uniform thickness part and (2) an acoustic black hole region of which the thickness decreases according to the power-law profile. Conventional acoustic black hole beams can be ultimately assembled as 8–10 aco

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Bah, Ibrahima, Iosif Bena, Pierre Heidmann, Yixuan Li, and Daniel R. Mayerson. "Gravitational footprints of black holes and their microstate geometries." Journal of High Energy Physics 2021, no. 10 (2021). http://dx.doi.org/10.1007/jhep10(2021)138.

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Abstract We construct a family of non-supersymmetric extremal black holes and their horizonless microstate geometries in four dimensions. The black holes can have finite angular momentum and an arbitrary charge-to-mass ratio, unlike their supersymmetric cousins. These features make them and their microstate geometries astrophysically relevant. Thus, they provide interesting prototypes to study deviations from Kerr solutions caused by new horizon-scale physics. In this paper, we compute the gravitational multipole structure of these solutions and compare them to Kerr black holes. The multipoles

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Kak, Subhash. "A Hollow Black Hole." Qeios 7, no. 4 (2025). https://doi.org/10.32388/ij74vb.2.

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A black hole is a singularity that exists hidden beyond the event horizon. Here we describe a massive black hole (MBH) structure that consists of black holes in a shell with a void within that supports normal dynamics as in the Schwarzschild or black hole cosmology. In an MBH, the hollow will support an expanding system in which objects far from the center will be accelerated to the shell. This view of the black hole from the outside complements the inside-out view of black hole cosmology.

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Matsuo, Yoshinori. "Universal structure of islands in evaporating black holes." Journal of High Energy Physics 2025, no. 3 (2025). https://doi.org/10.1007/jhep03(2025)068.

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Abstract The entanglement entropy of the Hawking radiation contains contributions from a region inside the black hole, which is called islands, implying that the Hawking radiation contains the information of islands. The boundary of the island is given by the quantum extremal surface, whose position is determined so that the entanglement entropy is extremized. In many cases of stationary black holes in the Hartle-Hawking vacuum and a few cases of evaporating black holes in the Unruh vacuum, it was already confirmed that the quantum extremal surface is located outside the horizon for black hole

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Hongbin Zhang, Ling Chen, and Baocheng Zhang. "Radiation shielding of analog BTZ black holes." Acta Physica Sinica, 2023, 0. http://dx.doi.org/10.7498/aps.72.20222296.

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Although the theory of analog gravity suggests that we can simulate the space-time structure of black holes using laboratory physical systems, it is difficult to find the analogue for rotating black holes in laboratory systems. In this article, we use a new field form for the optical vortex to study the analogous black hole structure close to the <i>Bañados-Teitelboim-Zaneli</i>(BTZ) black hole. We compare the similarities and differences of massless particles and sound waves by calculating their motions in space-time analogous to BTZ black holes and gravitational BTZ black holes.

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Wu, Shan, Kai-Qiang Qian, Rui-Hong Yue, Ming Zhang, and De-Cheng Zou. "Thermodynamics of charged Lifshitz black holes with scalar hair." Modern Physics Letters A, November 23, 2024. http://dx.doi.org/10.1142/s0217732324501712.

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In this paper, we discuss the generalized Einstein–Maxwell–Dilaton gravity theory with a nonminimal coupling between the Maxwell field and scalar field. Considering different geometric properties of black hole horizon structure, the charged dilaton Lifshitz black hole solutions are presented in 4-dimensional spacetimes. Later, utilizing the Wald Formalism, we derive the thermodynamic first law of black hole and conserved quantities. According to the relationship between the heat capacity and the local stability of black hole, we study the stability of charged Lifshitz black holes and identify

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