Article
Physics, Multidisciplinary
Sam Patrick, Harry Goodhew, Cisco Gooding, Silke Weinfurtner
Summary: Research has shown that fluid mechanical analogue black hole systems exhibit significant global mass changes in the presence of waves, leading to the possibility of studying backreaction with the presence of a dynamical metric.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
Pratik Ghosal, Rajarshi Ray
Summary: The nonthermal correction to the emission probability of particles from black holes is significant as it helps determine the probability of complete black hole evaporation and matches the initial entropy of the black hole. The study reveals that this probability distribution resembles Wien's displacement law for blackbody radiation.
Article
Physics, Multidisciplinary
F. C. E. Lima, A. R. P. Moreira, C. A. S. Almeida
Summary: This study investigates the influence of matter field and gauge field on the metric functions of the AdS(3) spacetime in the Maxwell-Higgs model. The appearance of black hole solutions is noticed with the presence of a matter field with a solitonic profile that can adjust the field variable. The compactification of the matter field affects the metric functions while not changing the structure of the magnetic black hole vortex horizon.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Physics, Multidisciplinary
Michael F. Wondrak, Walter D. van Suijlekom, Heino Falcke
Summary: This paper presents a new approach to black hole evaporation using a heat-kernel approach analogous to the Schwinger effect. By applying this method to a massless scalar field in a Schwarzschild spacetime, the authors demonstrate that spacetime curvature plays a role similar to the electric field strength in the Schwinger effect. The results are interpreted as local pair production in a gravitational field, and a radial production profile is derived. The emitted particles peak near the unstable photon orbit, and the effects of particle number and energy flux are found to be comparable to the Hawking case. However, the pair production mechanism itself does not explicitly rely on the presence of a black hole event horizon.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Haruna Katayama
Summary: Researchers proposed a black hole laser in Josephson transmission lines with metamaterial elements to amplify Hawking radiation, incorporating nonlinearities to create Kerr effect. The resulting laser is characterized by squeezing parameters and shows strong quantum correlation between Hawking and partner radiations due to pair production from the vacuum, as indicated by entanglement entropy measurements.
SCIENTIFIC REPORTS
(2021)
Article
Astronomy & Astrophysics
S. Jalalzadeh
Summary: We investigated the quantum deformation of the Wheeler-DeWitt equation for a Schwarzchild black hole and discovered the quantization, degeneracy, and boundedness of the event horizon area and mass. The degeneracy of states indicates the presence of entangled quantum black hole/white hole states, providing a new framework to study Einstein-Rosen wormhole solutions.
Article
Physics, Particles & Fields
Sareh Eslamzadeh, Javad T. Firouzjaee, Kourosh Nozari
Summary: In this paper, we investigate the 4D Einstein-Gauss-Bonnet black hole and its thermodynamics. The study includes the analysis of three different asymptotic spacetimes and the correlation between emission modes and temperature. The results show interesting behaviors of temperature and emission in different spacetime backgrounds.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Multidisciplinary
M. Atiqur Rahman
Summary: The Hawking temperature and Entropy of Reissner-Nordstrom (RN) black hole can be derived from energy quantization of test particles moving around different circular orbits, similar to Bohr's atomic model. Energy transitions may lead to detectable radiations in the future. By using gravitoelectromagnetism, it is possible to split the upper bound of energy without considering the quantization effects on energy level splitting, due to the hypothetical nature of gravitipole.
INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS
(2021)
Article
Physics, Particles & Fields
Subhajit Barman, Sajal Mukherjee
Summary: This article examines the Hawking effect and bounds on greybody factor in a spacetime with radial deformation, showing that the deformation parameter enhances both temperature and bounds. The radial deformation introduces changes in the location of the horizon, affecting the thermal behavior and creating a useful distinction with Kerr spacetime. Moreover, the separation of scalar field equation in terms of angular and radial coordinates facilitates the study of the Hawking effect and greybody factors.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Quantum Science & Technology
Limei Jing, Jiliang Jing
Summary: This article discusses the influence of projective measurements near the event horizon of the Einstein-Gauss-Bonnet black hole on the generation of entangled states, and presents the conditions for achieving the maximum entangled state.
QUANTUM INFORMATION PROCESSING
(2023)
Article
Physics, Particles & Fields
Chen-Kai Qiao, Mi Zhou
Summary: This study investigates the gravitational bending of acoustic Schwarzschild black hole and carefully analyzes the gravitational deflection angle of particles, weak gravitational lensing, and Einstein ring. The results show that gravitational bending effect is enhanced in acoustic Schwarzschild black hole compared to conventional Schwarzschild black hole, indicating that acoustic black holes may be more easily detectable in gravitational bending effects and weak gravitational lensing observations.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
Chen Yu-Zhu, Chen Yu-Jie, Li Shi-Lin, Zhang Fu-Lin, Dai Wu-Sheng
Summary: The paper constructs toy models of black hole and white hole, calculates the thermal effect of black hole, and considers the role of boundary conditions. Additionally, it shows that the white hole possesses a thermal absorption.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Astronomy & Astrophysics
K. Hajian, S. Liberati, M. M. Sheikh-Jabbari, M. H. Vahidinia
Summary: In certain family of Horndeski gravity theories, Wald's entropy formula does not lead to the correct first law for black hole thermodynamics. The temperature of the black hole needs to be modified to include effects of an effective metric, which results in the correct first law when used in conjunction with the entropy computed by the solution phase space method. These results have broader implications for issues such as Hawking radiation and the species problem, extending beyond the realm of Horndeski theories.
Article
Physics, Particles & Fields
Bei Sha, Zhi-E Liu
Summary: In this study, the tunneling radiation characteristics of fermions and bosons in Vaidya-Bonner de Sitter black hole space-time were corrected by considering Lorentz symmetry breaking theory. The new modified forms of Dirac equation for fermions with spin 1/2 and Klein-Gordon equation for bosons in the curved space-time of the black hole were obtained. Through solving these equations, new and corrected expressions for surface gravity, Hawking temperature, and tunneling rate of the black hole were obtained and discussed.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Physics, Mathematical
Ricardo Gallego Torrome
Summary: This paper discusses the scenario in certain theories of spacetime where black hole radiation does not completely evaporate due to the presence of a maximal proper acceleration. The mass of the black hole remnant is inversely proportional to the maximal acceleration. Additionally, a duality between the minimum mass of a Schwarzschild black hole in such spacetimes and the maximal acceleration implies that there must be an upper uniform bound on the force exerted on test particles in theories with a maximal acceleration.
INTERNATIONAL JOURNAL OF GEOMETRIC METHODS IN MODERN PHYSICS
(2022)
Article
Astronomy & Astrophysics
Nelson R. F. Braga, Octavio C. Junqueira
Summary: This study investigates the influence of rotation on the transition temperature of strongly interacting matter produced in non-central heavy ion collisions. By using a holographic description of an AdS black hole, the authors extend the analysis to the more realistic case where the matter spreads over a region around the rotational axis. The results show the coexistence of confined and deconfined phases and are consistent with the concept of local temperature in rotating frames developed by Tolman and Ehrenfest.
Article
Astronomy & Astrophysics
Bing Sun, Jiachen An, Zhoujian Cao
Summary: This paper investigates the effect of gravitational constant variation on the propagation of gravitational waves. By employing two analytical methods, the study finds that variations in the gravitational constant result in amplitude and phase corrections for gravitational waves, and the time variation of the gravitational constant can be constrained through the propagation of gravitational waves.
Article
Astronomy & Astrophysics
Abdellah Touati, Zaim Slimane
Summary: This letter presents the first study of Hawking radiation as a tunneling process within the framework of non-commutative gauge theory of gravity. The non-commutative Schwarzschild black hole is reconstructed using the Seiberg-Witten map and the star product. The emission spectrum of outgoing massless particles is computed using the quantum tunneling mechanism. The results reveal pure thermal radiation in the low-frequency scenario, but a deviation from pure thermal radiation in the high-frequency scenario due to energy conservation. It is also found that noncommutativity enhances the correlations between successively emitted particles.
Article
Astronomy & Astrophysics
Shahar Hod
Summary: The travel times of light signals between two antipodal points on a compact star's surface are calculated for two different trajectories. It is shown that, for highly dense stars, the longer trajectory along the surface may have a shorter travel time as measured by asymptotic observers. A critical value of the dimensionless density-area parameter is determined for constant density stars to distinguish cases where crossing through the star's center or following a semi-circular trajectory on the surface has a shorter travel time as measured by asymptotic observers.