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, Multidisciplinary
Victor Kolobov, Katrine Golubkov, Juan Ramon Munoz de Nova, Jeff Steinhauer
Summary: The study confirms the stability of spontaneous Hawking radiation and tracks its time evolution. The ramp-up of Hawking radiation is followed by stable spontaneous emission, leading to the formation of an inner horizon and stimulated Hawking radiation.
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
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
Astronomy & Astrophysics
Scott L. Todd, Giacomo Pantaleoni, Valentina Baccetti, Nicolas C. Menicucci
Summary: The study investigates a simple toy model of particle scattering in the flat spacetime limit of an analogue-gravity model. By performing a sonic analogue to Compton scattering, in-universe observers can determine if they are in motion with respect to their medium and find their velocity with respect to the medium. Through the interaction between the phonon field and the external particle, the Lorentz symmetry of the speed of sound in the medium is explored.
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
Astronomy & Astrophysics
Derek Raine, Paul G. Abel
Summary: In this study, a quantum optics treatment was used to analyze the behavior of a quantum oscillator freely falling into a pre-existing Schwarzschild black hole, where it was found that the oscillator radiates positive energy to infinity and negative energy into the black hole as it attempts to reach equilibrium with the ambient vacuum. The model's relationship to Hawking radiation is discussed.
CLASSICAL AND QUANTUM GRAVITY
(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
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
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
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
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
Materials Science, Multidisciplinary
Madalin Calamanciuc, Aurelian Isar
Summary: This paper investigates the influence of Hawking radiation on quantum entanglement for bimodal Gaussian states near a Schwarzschild black hole. The results show that the competition between the influences from Hawking temperature, squeezing, and field frequency favors the preservation of quantum entanglement. Furthermore, the presence of a thermal environment leads to the destruction of entanglement in a finite time.
RESULTS IN PHYSICS
(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, 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.
