We can immediately reproduce the stationary orbit of the photon sphere for the Schwarzschild black hole by settingd2ueqdϕ2=0:req=Rsueq=32Rs. Note, the trivial equilibrium solution foru=0(i.e. at infinite distances from the black hole) will not be discussed further. Simulated orbits Given...
In this study,we investigate the shadow and photon sphere of the black bole in clouds of strings and quintessence with static and infalling spherical accretions.We obtain the geodesics of the photons near a black hole with different impact parameters b to investigate how the string cloud model ...
Footnote 9 Note that the self-irradiation of the disk is possible also due to the unstable SPOs, but they could be send away from the sphere (to infinity) due to any small perturbative influence – for this reason we focus our attention on the influence of the stable spherical photons on...
when traced backward from the perspective of the observer, asymptotically approach bound photon orbits. The aggregate of all such bound photon orbits constitutes what is known as the photon region, or the photon sphere in the case of spherically symmetric spacetimes. It’...
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In this manuscript, we study photonsphere, shadow, quasinormal modes, Hawking temperature, and greybody bounds of a non-rotating Simpson–Visser black hole which is a regular black hole. We observe that though the radius of the photonsphere does depend on the Simpson–Visser parameterα\\...
We review the equations determining the photon sphere radius and the black hole shadow radius, and calculate the cosmological constant corrections arising when the dark energy action has the usual form, and when dark energy arises from a Weyl scaling invariant dark energy action. For black hole ...
On the other hand, we consider the non-radial motion of a free-falling test particle, in the equatorial plane, from spatial infinity to the black hole. In the ultrarelativistic limit, we show that the photon sphere acts as an effective Rindler horizon for the geodesic motion of the test ...
Black hole shadowPhoton sphereIn this work, we investigate the relationship between the geometrical properties, the photon sphere, the shadow, and the eikonal quasinormal modes of electrically charged black holes in 4D Einstein-Gauss-Bonnet gravity. Quasinormal modes are complex frequency oscillations ...
Comparing the calculated vertical angular diameter of the shadow with that of M87*, we found that the latter may possess about 1036 protons as its source of electric charge, if it is a rotating charged Weyl black hole. A complete derivation of the ergosphere and the static limit is also ...