Results 11 to 20 of about 51,175 (198)
Photon-Sphere Modes in Curved Optical Microcavities: A Black-Hole Analogue Laser. [PDF]
Adv Sci (Weinh)An optical analogue of a Schwarzschild black hole is realized using curved microcavities that preserve light‐like geodesics. A new family of laser modes confined around the photon sphere is identified alongside conventional whispering‐gallery modes. Analytical theory, numerical simulations, and experiments reveal curvature‐induced confinement, enabling
Xu C +9 more
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A Possible Evolution of Black Holes by Using a Hydrodynamic Analogy [PDF]
INCAS Bulletin, 2023 The creation of black holes starts with the implosion of a star after the fuel to power the thermonuclear reactions from inside was consumed. Then more and more mass is added until a critical value of the ratio mass/radius was obtained.
Corneliu BERBENTE, Sorin BERBENTE
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Gravity with perimeter action and gravitational singularities
Physics Letters B, 2021 We consider the perturbation of the Schwarzschild solution by the perimeter action. The asymptotic behaviour of the solution at infinity and at the horizon are calculated and analysed in the first approximation. In the regions far from the matter sources
George Savvidy
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High-dimensional Schwarzschild black holes in scalar–tensor–vector gravity theory
European Physical Journal C: Particles and Fields, 2021 We obtain a high-dimensional Schwarzschild black hole solution in the scalar–tensor–vector gravity (STVG), and then analyze the influence of parameter $$\alpha $$ α associated with a deviation of the STVG theory from General Relativity on event horizons ...
Xin-Chang Cai, Yan-Gang Miao
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Symmetries and conformal bridge in Schwarschild-(A)dS black hole mechanics
Journal of High Energy Physics, 2021 We show that the Schwarzschild-(A)dS black hole mechanics possesses a hidden symmetry under the three-dimensional Poincaré group. This symmetry shows up after having gauge-fixed the diffeomorphism invariance in the symmetry-reduced homogeneous Einstein-Λ
Jibril Ben Achour, Etera R. Livine
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Modified Schwarzschild metric from a unitary accelerating mirror analog
New Journal of Physics, 2021 We present a modified Schwarzschild solution for a model of evaporation of a black hole with information preservation. By drawing a direct analogy to the quantum pure accelerating mirror (dynamical Casimir effect of a 1D horizon), we derive a ...
Michael R R Good, Eric V Linder
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Neutrino trapping in extremely compact Tolman VII spacetimes
European Physical Journal C: Particles and Fields, 2021 Extremely compact objects trap gravitational waves or neutrinos, assumed to move along null geodesics in the trapping regions. The trapping of neutrinos was extensively studied for spherically symmetric extremely compact objects constructed under the ...
Zdeněk Stuchlík +3 more
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Gravitation near the Schwarzschild radius
International Journal of Advanced Astronomy, 2021 The problem of gravitation near the Schwarzschild radius is addressed. The pressure due to free fall velocity is introduced. At the Schwarz-schild radius, this pressure produces the force balancing the gravity thus stopping the collapse of the matter.
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The Lemaitre-Schwarzschild Problem Revisited [PDF]
, 2001 The Lemaitre and Schwarzschild analytical solutions for a relativistic spherical body of constant density are linked together through the use of the Weyl quadratic invariant.
A. Füzfa +9 more
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Nano-Infrared Imaging and Spectroscopy of Animal Cells in Liquid Environment. [PDF]
SmallThe use of SiC membranes as a stable, biocompatible interface between cells in their medium and the scanning probe of an infrared scattering‐type scanning near field optical microscope is shown to yield nano‐IR images and spectra from living fibroblast cells using a broadband synchrotron IR source. New possibilities for adjustments of probing depth for
Veber A, Spedalieri C, Kneipp J.
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