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
Xia Tan, Jie Zhang, Ran Li
Summary: This paper studies the modified forms of dynamic equations for bosons and fermions in curved space-time, taking into account the Lorentz breaking theory. By introducing an aether-like vector field and constructing gamma matrix correctly, new meaningful expressions for the dynamic equation of spin 1/2 Dirac particles in black hole space-time in gravity's rainbow are obtained, as well as the corresponding expressions for Hawking temperature, tunneling rate, and Bekenstein-Hawking entropy of the black hole. In addition, the distribution characteristics of Dirac particle energy levels are also studied, yielding meaningful results.
Article
Materials Science, Multidisciplinary
Aydin Deger, Matthew D. Horner, Jiannis K. Pachos
Summary: One of the key applications of AdS/CFT correspondence is the duality between the entanglement entropy of AdS black holes and lower-dimensional CFTs. By simulating the effect of rotationally symmetric 3D black holes on Dirac fields using a square lattice of fermions with inhomogeneous tunneling couplings, we identify the parametric regime where the predicted 2D CFT accurately describes the black hole entanglement entropy. We also demonstrate that a large family of 3D black holes exhibit the same ground-state entanglement entropy behavior as the BTZ black hole. The simplicity of our simulator allows for direct numerical investigation of various 3D black holes and the potential realization of these experiments with optical lattice technology.
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, 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
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)
Review
Astronomy & Astrophysics
Joao Marto
Summary: This paper analyses the back reaction problem between Hawking radiation and black holes in a simplified model for black hole evaporation in the context of quantum geometrodynamics. The Wheeler-DeWitt equation characteristics are transcribed into a Schrodinger's type of equation, and Hawking radiation and black hole quantum states evolution are considered under the influence of a potential including back reaction. Finally, entropy is estimated as a measure of the entanglement between black hole and Hawking radiation states in this model.
Article
Physics, Multidisciplinary
Izzet Sakalli, Esra Yoruk
Summary: This article studies the Hawking radiation of Schwarzschild black hole within the bumblebee gravity model. By introducing alternative coordinate systems and incorporating the Generalized Uncertainty Principle, the dependency of Hawking radiation temperature on coordinate systems is examined. The modified equation characterizing particle behavior near the event horizon is derived, and the modified temperature of the SBHBGM is obtained by calculating the tunneling probability using the modified action.
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
Astronomy & Astrophysics
H. S. Vieira
Summary: In this study, we analyze the sound perturbation of Unruh's acoustic effective geometry in (2 + 1) and (3 + 1) spacetime dimensions and provide an exact analytical expression for the quasibound states of these idealized black-hole configurations. Our main objective is to discuss the impact of having an event horizon in such effective metrics. We also examine the stability of the systems and present the radial eigenfunctions associated with these quasibound state frequencies. These metrics assume the same form as a Schwarzschild black hole near the event horizon and thus can potentially offer insights into the underlying classical and quantum physics of astrophysical black holes through analog acoustic probes.
Article
Physics, Multidisciplinary
Zhi-E. Liu, Jie Zhang, Shu-Zheng Yang
Summary: In accordance with Lorentz-violating theory, the dynamical equation of Dirac particles is altered in the Kinnersley black hole, showcasing new characteristics of Hawking quantum tunneling radiation. The Hawking temperature expression of the Kinnersley black hole has been revised for improved accuracy.
FRONTIERS IN PHYSICS
(2021)
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
Astronomy & Astrophysics
Michael R. R. Good, Alessio Lapponi, Orlando Luongo, Stefano Mancini
Summary: We study the evaporation of an uncharged and nonrotating black hole in vacuum, taking into account the effects of shrinking horizon area. Our approach involves the use of an analog accelerating moving mirror and considers the backreaction on the metric and smaller contributions from quantum fields. We provide insights on the implications of this modified evaporation on black hole entropy, considering nonequilibrium thermodynamics and the nonthermal part of Hawking radiation.
Article
Astronomy & Astrophysics
Y. Onika Laxmi, T. Ibungochouba Singh, I. Ablu Meitei
Summary: In this paper, we discuss the tunneling of scalar particles near the event horizon of both stationary and nonstationary Kerr-de Sitter black holes using Lorentz violation theory in curved space time. We derive the modified form of the Hamilton-Jacobi equation from the Klein-Gordon equation by applying Lorentz violation theory. The Hawking temperatures of the black holes are modified due to Lorentz violation, and the change in Bekenstein-Hawking entropy and modified Hawking temperatures depends not only on the black hole parameters but also on ether-like vectors u alpha.
MODERN PHYSICS LETTERS A
(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
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.