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
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
Physics, Multidisciplinary
James Lucietti
Summary: The study shows that in a generalized Majumdar-Papapetrou class of solutions to higher-dimensional Einstein-Maxwell theory, the only asymptotically flat spacetimes with a suitably regular event horizon are the standard multi-black holes. The proof involves a careful analysis of near-horizon geometry and an extension of the positive mass theorem to Riemannian manifolds with conical singularities, completing the classification of asymptotically flat, static, extreme black hole solutions in this theory.
ANNALES HENRI POINCARE
(2021)
Article
Physics, Particles & Fields
Hyewon Han, Bogeun Gwak
Summary: We studied the effects of metric fluctuations on the geometry of higher-dimensional black holes and extended the four-dimensional model to higher dimensions to account for quantum vacuum fluctuations. Using a perturbation method for small fluctuation amplitudes, we obtained the null geodesic equation for radially outgoing rays up to second order in the fluctuations. The fluctuation of the event horizon and the thermodynamic variables defined at the horizon also have dimension-dependent correction terms up to second order. A general solution for rays propagating near the horizon in a fluctuating geometry was derived, and in the large D limit, a compact form solution was found.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Astronomy & Astrophysics
Naresh Dadhich, Sanjar Shaymatov
Summary: In this paper, circular orbits around higher dimensional rotating black holes are studied. It is found that there are no stable circular orbits around Myers-Perry black holes, while bound and stable circular orbits do exist for pure GB/Lovelock black holes. This property serves as a nice discriminator between Myers-Perry and pure GB/Lovelock rotating black holes.
PHYSICS OF THE DARK UNIVERSE
(2022)
Article
Physics, Particles & Fields
Bobby E. Gunara, Fiki T. Akbar, Rizqi Fadli, Deden M. Akbar, Hadi Susanto
Summary: In this paper, a class of hairy static black holes in higher dimensional Einstein-Skyrme theories with a cosmological constant is constructed, considering a scalar field that is an SU(2) valued field. The study discusses the behavior of solutions near boundaries and establishes the local-global existence of black hole solutions, showing that black holes with finite energy exist under certain conditions. Additionally, linear stability analysis is performed to give insights into the stability of these black hole solutions.
ADVANCES IN THEORETICAL AND MATHEMATICAL PHYSICS
(2021)
Article
Astronomy & Astrophysics
Anna Puecher, Chinmay Kalaghatgi, Soumen Roy, Yoshinta Setyawati, Ish Gupta, B. S. SathyaprakashO, Chris Van den Broeck
Summary: Evidence for higher-order modes in gravitational wave signals has been found, allowing for new tests of general relativity. A test was developed to assess the consistency of the amplitudes of subdominant harmonics with general relativity predictions. Through simulations, the researchers investigated the extent to which deviations in harmonic amplitudes can be measured depending on source properties, and identified correlations between testing parameters and the inclination of the source relative to the observer. Finally, the test was applied to actual gravitational wave data, finding no violations of general relativity.
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
Physics, Multidisciplinary
Mudassar Rehman, Usman A. Gillani, Jamil Ahmed
Summary: In this study, we calculate the Hawking temperature of charged accelerating BTZ black holes using the WKB approximation in tunneling formalism. We analyze the Hawking radiation of Dirac and scalar particles emitted from these black holes. A graphical representation is also provided to compare the Hawking temperature in the presence and absence of acceleration parameter.
Article
Physics, Multidisciplinary
Gamal G. L. Nashed, Kazuharu Bamba
Summary: By exploring the rotating black hole solutions in N-dimensions with specific parameters and studying the relationships between physical quantities, we investigated the effects of the parameter b on black holes in multi-dimensional cases depend on the contribution of the correction R-2 term. Through calculating thermodynamic quantities and analyzing stability, we demonstrated that these black hole solutions exhibit thermodynamic stability.
Article
Astronomy & Astrophysics
Zachary Cox, Douglas M. Gingrich
Summary: Greybody factors are computed for massless fields emitted from higher-dimensional non-commutative geometry inspired black holes. Short-range potentials and path-ordered matrix exponentials are used for numerical calculations. The resulting absorption cross sections and emission spectra are compared with the Schwarzschild-Tangherlini black hole. A non-commutative black hole at its maximum temperature in seven extra dimensions will radiate a particle flux and power of 0.72-0.81 and 0.75-0.81, respectively, times lower than a Schwarzschild-Tangherlini black hole of the same temperature. A non-commutative black hole at its maximum temperature in seven extra dimensions will radiate a particle flux and power of 0.64-0.72 and 0.60-0.64, respectively, times lower than a Schwarzschild-Tangherlini black hole of the same mass.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Astronomy & Astrophysics
Moises Bravo-Gaete, Maria Montserrat Juarez-Aubry, Gerardo Velazquez Rodriguez
Summary: In this work, we study the existence of asymptotically Lifshitz black holes in four dimensions with a negative cosmological constant. We consider two scenarios, including dilatonic fields and a nonminimally coupled scalar field. We find solutions for specific values of the dynamical exponent, as well as additional solutions in the limiting case. We also study the thermodynamics of these new solutions and find that they satisfy the first law of thermodynamics and the Smarr relation.
Article
Physics, Particles & Fields
Sera Cremonini, Callum R. T. Jones, James T. Liu, Brian McPeak, Yuezhang Tang
Summary: This paper investigates the long-range force between zero-temperature black holes in two-derivative theories of gravity coupled to matter. It is found that the presence of massless scalar fields and four-derivative corrections can break the no-force condition for these black holes. By calculating the higher-derivative corrections to the scalar charges, it is determined that the higher-derivative corrected black holes can be either self-attractive or self-repulsive, depending on the values of the Wilson coefficients and scalar moduli VEVs.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Physics, Multidisciplinary
Antonia M. Frassino, Juan F. Pedraza, Andrew Svesko, Manus R. Visser
Summary: Holographic braneworlds provide a higher-dimensional origin for extended black hole thermodynamics, where classical black holes are mapped to quantum black holes with one less dimension, and the conformal matter sector on the brane affects the brane geometry. Varying the brane tension leads to a dynamical cosmological constant and a variable pressure attributed to the brane black hole. Thus, the standard thermodynamics in the bulk induces extended thermodynamics on the brane, including a work term from the brane, to all orders in backreaction. A microscopic interpretation of the extended thermodynamics of specific quantum black holes is given via double holography.
PHYSICAL REVIEW LETTERS
(2023)
Article
Astronomy & Astrophysics
Halil Kuyrukcu
Summary: The study explores the Weyl-Yang gauge theory of gravitation in a (4 + 3)-dimensional curved space-time, focusing on field equations in the usual four dimensions and finding solutions like (anti-)dyons, magnetic (anti-)monopoles, and non-Einsteinian solutions. The presence of the cosmological constant and its association with warping functions and three-sphere radius are highlighted, along with the importance of nonconstant warping functions for discovering new exact Schwarzschild-like solutions.
CLASSICAL AND QUANTUM GRAVITY
(2021)