Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A
Horizon-scale images of black holes (BHs) and their shadows have opened an
unprecedented window onto tests of gravity and fundamental physics in the strong-field …
unprecedented window onto tests of gravity and fundamental physics in the strong-field …
Photon ring and observational appearance of a hairy black hole
Q Gan, P Wang, H Wu, H Yang - Physical Review D, 2021 - APS
Recently, the image of a Schwarzschild black hole with an accretion disk has been revisited,
and it showed that the “photon ring,” defined as highly bent light rays that intersect the disk …
and it showed that the “photon ring,” defined as highly bent light rays that intersect the disk …
Gravitational lensing by two photon spheres in a black-bounce spacetime in strong deflection limits
N Tsukamoto - Physical Review D, 2021 - APS
We investigate gravitational lensing by a primary photon sphere which is a sphere filled with
unstable circular light orbits, and by a secondary photon sphere on a wormhole throat in a …
unstable circular light orbits, and by a secondary photon sphere on a wormhole throat in a …
Gravitational lensing in the Simpson-Visser black-bounce spacetime in a strong deflection limit
N Tsukamoto - Physical Review D, 2021 - APS
A Simpson-Visser spacetime has two non-negative parameters a and m and its metric is
correspond with (i) a Schwarzschild metric for a= 0 and m≠ 0,(ii) a regular black hole metric …
correspond with (i) a Schwarzschild metric for a= 0 and m≠ 0,(ii) a regular black hole metric …
Weak deflection angle of Kazakov–Solodukhin black hole in plasma medium using Gauss–Bonnet theorem and its greybody bonding
In this paper, we study light rays in a Kazakov–Solodukhin black hole. To this end, we use
the optical geometry of the Kazakov–Solodukhin black hole within the Gauss–Bonnet …
the optical geometry of the Kazakov–Solodukhin black hole within the Gauss–Bonnet …
Weak deflection angle of black-bounce traversable wormholes using Gauss-Bonnet theorem in the dark matter medium
A Övgün - Turkish Journal of Physics, 2020 - journals.tubitak.gov.tr
Inthispaper, wefirstusetheopticalmetricsofblack-bouncetraversablewormholestocalculatethe…
curvature. Then we use the Gauss-Bonnet theorem to obtain the weak deflection angle of …
curvature. Then we use the Gauss-Bonnet theorem to obtain the weak deflection angle of …
Testing generalized Einstein–Cartan–Kibble–Sciama gravity using weak deflection angle and shadow cast
In this paper, we use a new asymptotically flat and spherically symmetric solution in the
generalized Einstein–Cartan–Kibble–Sciama (ECKS) theory of gravity to study the weak …
generalized Einstein–Cartan–Kibble–Sciama (ECKS) theory of gravity to study the weak …
Schwarzschild-like black hole with a topological defect in bumblebee gravity
In this paper, we derive an exact black hole spacetime metric in the Einstein–Hilbert–
Bumblebee (EHB) gravity around global monopole field. We study the horizon, temperature …
Bumblebee (EHB) gravity around global monopole field. We study the horizon, temperature …
Gravitational lensing by a photon sphere in a Reissner-Nordström naked singularity spacetime in strong deflection limits
N Tsukamoto - Physical Review D, 2021 - APS
We investigate gravitational lensing by a photon sphere in a Reissner-Nordström naked
singularity spacetime in strong deflection limits. Because of the nonexistence of an event …
singularity spacetime in strong deflection limits. Because of the nonexistence of an event …
Gravitational lensing by using the 0th order of affine perturbation series of the deflection angle of a ray near a photon sphere
N Tsukamoto - The European Physical Journal C, 2023 - Springer
The 0th order of affine perturbation series of the deflection angle of a ray near a photon
sphere is more accurate than a deflection angle in a strong deflection limit, which is used …
sphere is more accurate than a deflection angle in a strong deflection limit, which is used …