How does the Event Horizon Telescope image black holes? To be clear, the EHT can't image the black hole itself thanks to the light-trapping action of the event horizon. A black hole is a region of spacetime that captures any incident light and thus emits no light. That means black holes...
The ergoregion of the rotating black holes is a region of spacetime where the time translation Killing vector χa becomes spacelike, and also that every timelike vector acquires rotational (ϕ) counterpart. Hence, a particle can enter into ergoregion and can leave again, but it cannot remain...
The structure of photon orbits is also studied for the different values of parameters involved in. The results obtained are also then compared with those of the Kerr black hole spacetime and Schwarzschild black hole spacetime in GR with or without quintessence....
Ingeneral relativity, an event horizon (EH) is a region in spacetime beyond which events cannot affect an outside observer. In layman’s terms, it is defined as the shell of “points of no return”, i.e., the boundary at which the gravitational pull of a massive object becomes so grea...
As real black holes will never be precisely non-rotating and electrically neutral, it is of interest to determine whether such a transfer of matter from one universe to another is possible. If it were, it might imply the possibility of matter appearing explosively in our region of spacetime ...
Formation of a black hole from an AdS spacetime.doi:10.1063/1.2803793We shall first discuss motivation for higher dimension even for classical description of gravitational dynamics and then construct a black hole out of an anti-deSitter (AdS) spacetime by prescribing a coupling between Gauss-Bonnet...
Cai, Strong gravitational lensing in a black-hole spacetime dominated by dark energy, Phys. Rev. D 88, 104007 (2013); S. Wei, Y. Liu, C. Fu, and K. Yang, Strong field limit analysis of gravitational lensing in Kerr-Taub-NUT spacetime, JCAP 10, 053 (2012); S. Wei and Y. Liu,...
The black hole merger, on the other hand, was invisible except for the spacetime ripples that expanded outwards from it. In this case, although telescopes scanned the region of the merger after the gravitational waves were detected, Professor Scott said ...
is not self-adjoint and its eigenfunctions are not orthonormal. 4 Conclusion In this paper, we have studied the properties of a scalar field in the near- horizon region of a massive Schwarzschild black hole. The quantum Hamilto- nian governing the near-horizon dynamics is found to be scale...
appears distorted due to gravitational lensing. And the side of the detector away from the accretion disk will be relatively darker, forming a dark region. The images of the black hole shadow can help us to understand the spacetime geometry of the event horizon for the black hole and its ...