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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…
Accreting Black Holes
Sourabh Nampalliwar, Cosimo Bambi
This chapter provides a general overview of the theory and observations of black holes in the Universe and on their interpretation. We briefly review the black hole classes, accret…
Fundamental Concepts
Cosimo Bambi, Sourabh Nampalliwar
This chapter briefly discusses the fundamental properties of black holes in general relativity, the discovery of astrophysical black holes and their main astronomical observations,…
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…
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…
Black holes, gravitational waves and fundamental physics: a roadmap
Leor Barack, Vitor Cardoso, Samaya Nissanke +203
The grand challenges of contemporary fundamental physics---dark matter, dark energy, vacuum energy, inflation and early universe cosmology, singularities and the hierarchy problem-…
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…
Iron line spectroscopy with Einstein-dilaton-Gauss-Bonnet black holes
Sourabh Nampalliwar, Cosimo Bambi, Kostas Kokkotas +1
Einstein-dilaton-Gauss-Bonnet gravity is a well-motivated alternative theory of gravity that emerges naturally from string theory. While black hole solutions have been known in thi…
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…