412 citations · 3.1k across the 30 of their papers we have counts for
6 papers · 1 filter
Sgr A*: The Optimal Testbed of Strong-Field Gravity
Dimitrios Psaltis, Tim Johannsen
The black hole in the center of the Milky Way has been observed and modeled intensely during the last decades. It is also the prime target of a number of new experiments that aim t…
A Ray-Tracing Algorithm for Spinning Compact Object Spacetimes with Arbitrary Quadrupole Moments. I. Quasi-Kerr Black Holes
Dimitrios Psaltis, Tim Johannsen
We describe a new numerical algorithm for ray tracing in the external spacetimes of spinning compact objects characterized by arbitrary quadrupole moments. Such spacetimes describe…
Testing the No-Hair Theorem with Observations in the Electromagnetic Spectrum. III. Quasi-Periodic Variability
Tim Johannsen, Dimitrios Psaltis
According to the no-hair theorem, astrophysical black holes are uniquely described by their masses and spins. An observational test of the no-hair theorem can be performed by measu…
Testing the No-Hair Theorem with Observations of Black Holes in the Electromagnetic Spectrum
Tim Johannsen, Dimitrios Psaltis
According to the no-hair theorem, astrophysical black holes are uniquely described by their mass and spin. In this paper, we review a new framework for testing the no-hair hypothes…
Testing the No-Hair Theorem with Observations in the Electromagnetic Spectrum: II. Black-Hole Images
Tim Johannsen, Dimitrios Psaltis
According to the no-hair theorem, all astrophysical black holes are fully described by their masses and spins. This theorem can be tested observationally by measuring (at least) th…
Testing the No-Hair Theorem with Observations in the Electromagnetic Spectrum: I. Properties of a Quasi-Kerr Spacetime
Tim Johannsen, Dimitrios Psaltis
According to the no-hair theorem, an astrophysical black hole is uniquely described by only two quantities, the mass and the spin. In this series of papers, we investigate a framew…