204 citations · 1.8k across the 55 of their papers we have counts for
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Towards precision tests of general relativity with black hole X-ray reflection spectroscopy
Ashutosh Tripathi, Sourabh Nampalliwar, Askar B. Abdikamalov +5
Astrophysical black hole systems are the ideal laboratories for testing Einstein's theory of gravity in the strong field regime. We have recently developed a framework which uses t…
Testing the Kerr metric with X-ray Reflection Spectroscopy of Mrk 335 Suzaku data
Kishalay Choudhury, Sourabh Nampalliwar, Askar B. Abdikamalov +4
Einstein's gravity has undergone extensive tests in the weak field gravitational limit, with results in agreement with theoretical predictions. There exist theories beyond general…
Observing the Shadows of Stellar-Mass Black Holes with Binary Companions
Harrison Gott, Dimitry Ayzenberg, Nicolas Yunes +1
The observation of the shadows cast by the event horizon of black holes on the light emitted in its neighborhood is the target of current very-long-baseline-interferometric observa…
Black Hole Shadow as a Test of General Relativity: Quadratic Gravity
Dimitry Ayzenberg, Nicolas Yunes
Observations of the black hole shadow of supermassive black holes, such as Sagittarius A* at the center of our Milky Way galaxy, allow us to study the properties of black holes and…
A study of the strong gravity region of the black hole in GS 1354-645
Yerong Xu, Sourabh Nampalliwar, Askar B. Abdikamalov +5
It is thought that the spacetime metric around astrophysical black holes is well described by the Kerr solution of Einstein's gravity. However, a robust observational evidence of t…
RELXILL_NK: a relativistic reflection model for testing Einstein's gravity
Cosimo Bambi, Askar B. Abdikamalov, Dimitry Ayzenberg +6
Einstein's theory of general relativity was proposed over 100 years ago and has successfully passed a large number of observational tests in the weak field regime. However, the str…
Iron Line Spectroscopy of Black Holes in Vector-Tensor Galileons Modified Gravity
Jinye Yang, Dimitry Ayzenberg, Cosimo Bambi
Recently, a rotating black hole solution was found in Vector-Tensor Galileons modified gravity that has some significant differences from the Kerr black hole solution. We study the…
Testing the Kerr metric using X-ray reflection spectroscopy: spectral analysis of GX 339-4
Jingyi Wang, Askar B. Abdikamalov, Dimitry Ayzenberg +5
Signatures of X-ray reprocessing (reflection) out of an accretion disk are commonly observed in the high-energy spectrum of accreting black holes, and can be used to probe the stro…
Testing the Kerr nature of the supermassive black hole in Ark 564
Ashutosh Tripathi, Sourabh Nampalliwar, Askar B. Abdikamalov +3
Einstein's theory of general relativity has been extensively tested in weak gravitational fields, mainly with experiments in the Solar System and observations of radio pulsars, and…
Testing conformal gravity with the supermassive black hole in 1H0707-495
Menglei Zhou, Zheng Cao, Askar Abdikamalov +4
Recently, two of us have found a family of singularity-free rotating black hole solutions in Einstein's conformal gravity. These spacetimes are characterized by three parameters: t…