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Scattering of massive particles from black holes and naked singularities
Angelos Karakonstantakis, Włodek Kluźniak, Maciek Wielgus
We performed a numerical study of the dynamics of massive particles orbiting black holes and naked singularities in the Reissner-Nordström geometry. We modeled a stream of particle…
Particle motion around luminous neutron stars: effects of deviation from Schwarzschild spacetime
Ronaldo S. S. Vieira, Maciek Wielgus
We study trajectories of test particles around a luminous, static, spherically symmetric neutron star, under the combined influence of gravity and radiation. In general relativity,…
Prospects for Future Experimental Tests of Gravity with Black Hole Imaging: Spherical Symmetry
Prashant Kocherlakota, Luciano Rezzolla, Rittick Roy +1
Astrophysical black holes (BHs) are universally expected to be described by the Kerr metric, a stationary, vacuum solution of general relativity (GR). Indeed, by imaging M87$^\star…
Photon rings of spherically symmetric black holes and robust tests of non-Kerr metrics
Maciek Wielgus
Under very general assumptions on the accretion flow geometry, images of a black hole illuminated by electromagnetic radiation display a sequence of photon rings (demagnified and r…
Constraints on black-hole charges with the 2017 EHT observations of M87*
Prashant Kocherlakota, Luciano Rezzolla, Heino Falcke +234
Our understanding of strong gravity near supermassive compact objects has recently improved thanks to the measurements made by the Event Horizon Telescope (EHT). We use here the M8…
Three-dimensional general relativistic Poynting-Robertson effect. IV. Slowly rotating and non-spherical quadrupolar massive source
Vittorio De Falco, Maciek Wielgus
We consider a further extension of our previous works in the treatment of the three-dimensional general relativistic Poynting-Robertson effect, which describes the motion of a test…
Light echos and coherent autocorrelations in a black hole spacetime
Paul M. Chesler, Lindy Blackburn, Sheperd S. Doeleman +4
The Event Horizon Telescope recently produced the first images of a black hole. These images were synthesized by measuring the coherent correlation function of the complex electric…
Gravitational Test Beyond the First Post-Newtonian Order with the Shadow of the M87 Black Hole
Dimitrios Psaltis, Lia Medeiros, Pierre Christian +185
The 2017 Event Horizon Telescope (EHT) observations of the central source in M87 have led to the first measurement of the size of a black-hole shadow. This observation offers a new…
Reflection-asymmetric wormholes and their double shadows
Maciek Wielgus, Jiri Horak, Frederic Vincent +1
We discuss construction and observational properties of wormholes obtained by connecting two Reissner-Nordstrom spacetimes with distinct mass and charge parameters. These objects a…
Geometric modeling of M87* as a Kerr black hole or a non-Kerr compact object
F. H. Vincent, M. Wielgus, M. A. Abramowicz +4
Context. The Event Horizon Telescope (EHT) collaboration recently obtained first images of the surroundings of the supermassive compact object M87* at the center of the galaxy M87.…
Stress-energy tensor of a radiating sphere inclosing black hole
Maciek Wielgus, Marek A. Abramowicz
We consider a uniformly luminous radiating sphere and a static black hole located in the center of that sphere. We give analytic formulas for radiation stress-energy tensor compone…
Cosmic background radiation in the vicinity of a Schwarzschild black hole: no classic firewall
Maciek Wielgus, George F. R. Ellis, Frederic H. Vincent +1
The Cosmic Blackbody Background Radiation pervades the entire Universe, and so falls into every astrophysical black hole. The blueshift of the infalling photons, measured by a stat…