X-Ray Tests of General Relativity with Black Holes

Abstract

General relativity is one of the pillars of modern physics. For decades, the theory has been mainly tested in the weak field regime with experiments in the Solar System and radio observations of binary pulsars. Until 2015, the strong field regime was almost completely unexplored. Thanks to new observational facilities, the situation has dramatically changed in the last few years. Today we have gravitational wave data of the coalesce of stellar-mass compact objects from the LIGO-Virgo-KAGRA Collaboration, images at mm wavelengths of the supermassive black holes in M87${}^{\ast }$ and SgrA${}^{\ast }$ from the Event Horizon Telescope Collaboration, and X-ray data of accreting compact objects from a number of X-ray missions. Gravitational wave tests and black hole imaging tests are certainly more popular and are discussed in other articles of this Special Issue. The aim of the present manuscript is to provide a pedagogical review on X-ray tests of general relativity with black holes and to compare this kind of tests with those possible with gravitational wave data and black hole imaging.

arXiv comment16 pages, 5 figures. Invited contribution for the Special Issue "Role of Black Holes in Testing Modified Theories of Gravity" for Symmetry (Ed. Rahul Kumar Walia). v2: refereed version

References in corpus (68)

• The Confrontation between General Relativity and Experiment
• Tests of general relativity with GW150914
• Tests of General Relativity with the Binary Black Hole Signals from the LIGO-Virgo Catalog GWTC-1
• Kerr black holes with scalar hair
• Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A${}^{\ast }$
• Improved Reflection Models of Black-Hole Accretion Disks: Treating the Angular Distribution of X-rays
• Science with the space-based interferometer LISA. V: Extreme mass-ratio inspirals
• Cosmological Tests of Modified Gravity
• Theoretical Physics Implications of the Binary Black-Hole Mergers GW150914 and GW151226
• First Sagittarius A* Event Horizon Telescope Results. VI: Testing the Black Hole Metric
• Stationary Black Holes: Uniqueness and Beyond
• X-ray reflected spectra from accretion disk models. III. A complete grid of ionized reflection calculations
• Testing the rotational nature of the supermassive object M87* from the circularity and size of its first image
• Irradiation of an Accretion Disc by a Jet: General Properties and Implications for Spin Measurements of Black Holes
• The Neutron Star and Black Hole Initial Mass Function
• A Metric for Rapidly Spinning Black Holes Suitable for Strong-Field Tests of the No-Hair Theorem
• X-ray reflected spectra from accretion disk models. I. Constant density atmospheres
• Gravitational Test Beyond the First Post-Newtonian Order with the Shadow of the M87 Black Hole
• Testing black hole candidates with electromagnetic radiation
• Cosmological Tests of Gravity
• Kerr black holes with Proca hair
• Rotating Black Holes in Dilatonic Einstein-Gauss-Bonnet Theory
• General parametrization of axisymmetric black holes in metric theories of gravity
• Regular Black Hole Metric with Three Constants of Motion
• Recent developments in gravitational collapse and spacetime singularities
• Cosmological Tests of Gravity
• A novel family of rotating black hole mimickers
• Towards precision measurements of accreting black holes using X-ray reflection spectroscopy
• Testing the Kerr black hole hypothesis using X-ray reflection spectroscopy
• Asymptotic safety casts its shadow
• Astrophysical Black Holes: A Compact Pedagogical Review
• On generic parametrizations of spinning black-hole geometries
• Spacetime completeness of non-singular black holes in conformal gravity
• Testing general relativity with the reflection spectrum of the supermassive black hole in 1H0707$-$495
• Towards precision tests of general relativity with black hole X-ray reflection spectroscopy
• Public Release of RELXILL_NK: A Relativistic Reflection Model for Testing Einstein's Gravity
• Note on the effect of a massive accretion disk in the measurements of black hole spins
• Testing the Kerr black hole hypothesis using X-ray reflection spectroscopy and a thin disk model with finite thickness
• Astronomical tests for quantum black hole structure
• Testing conformal gravity with the supermassive black hole in 1H0707-495
• Testing conformal gravity with astrophysical black holes
• Testing General Relativity with NuSTAR data of Galactic Black Holes
• Gravitational-wave versus X-ray tests of strong-field gravity
• Black hole evaporation in conformal gravity
• Regular Black Holes: Towards a New Paradigm of Gravitational Collapse
• Reflection spectra of thick accretion disks
• Tests of the Kerr hypothesis with GRS 1915+105 using different RELXILL flavors
• Testing the Kerr Black Hole Hypothesis with GX 339-4 by a combined analysis of its thermal spectrum and reflection features
• Testing the accuracy of reflection-based supermassive black hole spin measurements in AGN
• Modeling bias in supermassive black hole spin measurements
• Note on a new parametrization for testing the Kerr metric
• Unattainable extended spacetime regions in conformal gravity
• Testing the Kerr black hole hypothesis with GRS 1716-249 by combining the continuum-fitting and the iron-line methods
• Testing general relativity with the stellar-mass black hole in LMC X-1 using the continuum-fitting method
• XSPEC model for testing the Kerr black hole hypothesis using the continuum-fitting method
• Constraints on Einstein-Maxwell dilaton-axion gravity from X-ray reflection spectroscopy
• A parametrization to test black hole candidates with the spectrum of thin disks
• Testing the Kerr black hole hypothesis with the continuum-fitting and the iron line methods: the case of GRS 1915+105
• Shining X-rays on asymptotically safe quantum gravity
• Testing General Relativity with black hole X-ray data: a progress report
• Black hole accretion discs and screened scalar hair
• Constraining the Konoplya-Rezzolla-Zhidenko deformation parameters II: limits from stellar-mass black hole X-ray data
• Singularity-free black holes in conformal gravity: new observational constraints
• Testing relativistic reflection models with GRMHD simulations of accreting black holes
• Constraining possible variations of the fine structure constant in strong gravitational fields with the K$\alpha$ iron line
• Constraining the KRZ deformation parameters I: limits from supermassive black hole X-ray data
• Testing the Weak Equivalence Principle near black holes
• Testing the $\delta$-Kerr metric with black hole X-ray data

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• Testing General Relativity with Black Hole X-Ray Data and ABHModels