Article
Physics, Particles & Fields
Deyou Chen, Yucheng He, Jun Tao
Summary: In this paper, topological numbers for five-, six- and seven-dimensional anti-de Sitter black holes in the ghost-free massive gravity are studied. It is found that charged black holes have the same topological number. The topological numbers for uncharged black holes are either 0 or 1, with specific values determined by the parameters of the black holes. This work demonstrates the important role of the parameters of the ghost-free massive gravity in the topological classes of black holes.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Ruifeng Dong, Dejan Stojkovic
Summary: Gravitational waves are becoming a reliable tool for testing alternative theories of gravity, with features in the emission during the black hole ringdown phase providing a direct probe of the spacetime outside the black hole. The study found that coupling between gravitational perturbations and scalar hair of black holes can change the quasinormal ringing of black holes, producing echoes in emitted gravitational waves. This suggests a possible method for testing massive gravity using gravitational wave observations.
Article
Astronomy & Astrophysics
Bryce Cyr, Hao Jiao, Robert Brandenberger
Summary: This paper investigates whether superconducting cosmic string loops can provide sufficiently strong overdensities in the early universe to address the mystery of black hole formation, by reviewing a set of direct collapse conditions and demonstrating how superconducting cosmic string loops can satisfy these conditions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Luis A. Anchordoqui, Ignatios Antoniadis, Xing Huang, Dieter Luest, Francois Rondeau, Tomasz R. Taylor
Summary: “We propose an explanation for the discrepancy between the measured anomalous magnetic moment of the muon and the Standard Model prediction, suggesting that Kaluza-Klein excitations play a dominant role. We reexamine the constraints on KK masses and couplings and find that they are more severe than previously thought, but our explanation remains plausible if certain KK modes are lighter than LEP energy.”
Article
Astronomy & Astrophysics
Neil J. Cornish
Summary: In the next decade, the launch of space-based gravitational wave detectors such as Taiji and TianQin is expected. These detectors aim to detect the merger of black holes with masses between 103 M0 and 108 M0, which may produce electromagnetic signals in addition to gravitational waves. Low latency detection of gravitational wave signals is crucial for capturing all phases of the emission and guiding the search for counterparts.
Article
Astronomy & Astrophysics
Usman A. Gillani, Jamil Ahmed, Mudassar Rehman
Summary: This work presents Hawking radiation as a quantum tunneling phenomenon from accelerating BTZ black holes. The Hawking radiation from the horizon of the accelerating BTZ black hole for Dirac particles is calculated using the WKB approximation for the Dirac equation in the background of three-dimensional black holes. The tunneling probability obtained from this procedure is used to calculate the Hawking temperature of the background three-dimensional black hole. The study is consistent with previous research in the absence of the acceleration parameter, and quantum corrections to the Hawking temperature of the accelerating BTZ black hole are also investigated.
Article
Astronomy & Astrophysics
Nianyi Chen, Yueying Ni, A. Miguel Holgado, Tiziana Di Matteo, Michael Tremmel, Colin DeGraf, Simeon Bird, Rupert Croft, Yu Feng
Summary: In this study, we investigate the merging of massive black holes (MBHs) and their associated gravitational wave signals using the cosmological simulation Astrid. We find that only a small percentage of seed MBH pairs merge at high redshifts after considering unresolved dynamical friction (DF) evolution and binary hardening. With the higher initial eccentricity predicted by Astrid, we estimate a higher merger rate for the z > 3 MBH population compared to previous predictions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Alessandro Lupi, Zoltan Haiman, Marta Volonteri
Summary: The study reveals that in overdense regions during the early universe, conditions conducive to the formation of massive seed black holes exist, which is crucial for the formation of high-redshift quasar host haloes.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Almendra Aragon, P. A. Gonzalez, Joel Saavedra, Yerko Vasquez
Summary: In this study, the propagation of scalar fields in 2 + 1-dimensional Coulomb-like AdS black holes is analyzed, demonstrating stability under Dirichlet boundary conditions. By solving the Klein-Gordon equation using various methods, quasinormal frequencies are determined, showing dependence on parameters such as black hole charge, angular number, and overtone number. Additionally, the introduction of a Coulomb-like field from nonlinear electrodynamics to general relativity results in the emergence of two branches of quasinormal frequencies for a null angular number, contrasting with the static BTZ black hole.
GENERAL RELATIVITY AND GRAVITATION
(2021)
Article
Astronomy & Astrophysics
Alejandro Vigna-Gomez, Silvia Toonen, Enrico Ramirez-Ruiz, Nathan W. C. Leigh, Jeff Riley, Carl-Johan Haster
Summary: This study explores the evolution of stellar triples with massive components leading to sequential binary black hole mergers, suggesting that these mergers can also occur outside of dense dynamical environments. The research also analyzes the evolution of two gravitational-wave sources, GW170729 and GW190521, proposing that the former originates from a low-metallicity field triple and arguing against the latter being formed in the field. In conclusion, the study emphasizes the importance of triple stellar evolution in understanding gravitational wave sources and other energetic transients.
ASTROPHYSICAL JOURNAL LETTERS
(2021)
Article
Physics, Applied
Ji-Chong Yang, Yu Shi
Summary: This paper investigates the spectral functions of the Higgs mode in the O(2) model, showing that it cannot explain the disappearance of the response at the weak interaction limit or the similarity between the longitudinal and scalar susceptibilities in the visibility of the Higgs mode. A possible lower peak at about 2m(σ) is also noted.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2021)
Article
Astronomy & Astrophysics
Srija Chakraborty, Simona Gallerani, Tommaso Zana, Alberto Sesana, Milena Valentini, David Izquierdo-Villalba, Fabio Di Mascia, Fabio Vito, Paramita Barai
Summary: We investigate the coalescence of massive black hole binaries at 6 < z < 10 using cosmological hydrodynamical simulations. Our simulations predict merger rates ranging from 3 to 15 yr^(-1) at z ~ 6, after correcting for a bias factor of 20-30. We find that 83% of MBHBs will merge within the Hubble time, and 21% within 1 Gyr.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Physics, Particles & Fields
Min-Yan Ou, Meng-Yun Lai, Hyat Huang
Summary: This article investigates the time evolutions of the field perturbations in certain asymmetric wormhole and black bounce backgrounds. It is found that echo signals only arise in certain wormhole cases. The influences of these wormhole echoes are examined considering their mass, charge, and the asymmetry of spacetime. The results indicate that a massive wormhole with a smaller charge is easier to observe echo signals. Moreover, the asymmetry of wormhole spacetime leads to lower frequency echoes. Additionally, analytical results demonstrate that the negative regions of effective potentials are enclosed by the black hole horizons for a class of symmetric black bounce metrics, suggesting the stability of these symmetric metrics.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Valerio De Luca, Paolo Pani
Summary: Research shows that tidal Love numbers (TLNs) of black holes surrounded by matter fields are non-zero and can be used to probe the environment around binary black holes. By computing TLNs under tidal perturbations, stringent constraints can be imposed on the mass of ultralight bosons condensing around black holes, providing measurements for future gravitational-wave detectors. Additionally, the mass range of ultralight bosons can be probed by LISA and Einstein Telescope across a broad spectrum, enhancing our understanding of tidal effects from dressed black holes.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Younes Younesizadeh
Summary: The study focuses on obtaining the exact rotating black hole solution in the f(R)-gravity model and analyzing its thermodynamics, including comparison with the BTZ black hole solution. The validity of the first law of thermodynamics was demonstrated, and the stability of the obtained solution was investigated. No evidence of P-V criticality similar to the ordinary BTZ case was found.
PHYSICS OF THE DARK UNIVERSE
(2021)
Article
Astronomy & Astrophysics
Ganim Gecim, Yusuf Sucu
Article
Physics, Particles & Fields
Ganim Gecim, Yusuf Sucu
ADVANCES IN HIGH ENERGY PHYSICS
(2017)
Article
Physics, Mathematical
G. Gecim, Y. Kucukakca
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2018)
Article
Physics, Particles & Fields
Ganim Gecim, Yusuf Sucu
ADVANCES IN HIGH ENERGY PHYSICS
(2018)
Article
Physics, Particles & Fields
Ganim Gecim, Yusuf Sucu
ADVANCES IN HIGH ENERGY PHYSICS
(2018)
Article
Astronomy & Astrophysics
Ganim Gecim, Yusuf Sucu
MODERN PHYSICS LETTERS A
(2018)
Article
Astronomy & Astrophysics
Ganim Gecim, Yusuf Sucu
GENERAL RELATIVITY AND GRAVITATION
(2018)
Article
Astronomy & Astrophysics
Ganim Gecim, Yusuf Sucu
GRAVITATION & COSMOLOGY
(2019)
Article
Physics, Particles & Fields
Semra Gurtas Dogan, Ganim Gecim, Yusuf Sucu
ADVANCES IN HIGH ENERGY PHYSICS
(2019)
Article
Physics, Particles & Fields
Ganim Gecim, Yusuf Sucu
EUROPEAN PHYSICAL JOURNAL C
(2019)
Article
Physics, Particles & Fields
Ganim Gecim, Yusuf Sucu
ADVANCES IN HIGH ENERGY PHYSICS
(2020)
Article
Astronomy & Astrophysics
Ganim Gecim
MODERN PHYSICS LETTERS A
(2020)
Article
Physics, Multidisciplinary
C. Tekincay, G. Gecim, Y. Sucu
Summary: This study investigates quantum gravity corrections to the thermodynamic quantities of Reissner-Nordstrom anti-de Sitter black hole surrounded by quintessence under the GUP effect. The findings suggest higher efficiency under the GUP effect compared to the standard one, especially when considering the attractive Coulomb interaction and influence of zitterbewegung particles.
Article
Physics, Multidisciplinary
Ganim Gecim
TURKISH JOURNAL OF PHYSICS
(2020)
