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Testing General Relativity with NuSTAR data of Galactic Black Holes

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arxiv 2012.10669 v2 pith:ZJDZV237 submitted 2020-12-19 astro-ph.HE gr-qc

Ashutosh Tripathi , Yuexin Zhang , Askar B. Abdikamalov , Dimitry Ayzenberg , Cosimo Bambi , Jiachen Jiang , Honghui Liu , Menglei Zhou This is my paper · ORCID
classification astro-ph.HEgr-qc
keywords blackconstraintsholesgalacticgeneralkerrnustarrelativity
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Einstein's theory of General Relativity predicts that the spacetime metric around astrophysical black holes is described by the Kerr solution. In this work, we employ state-of-the-art in relativistic reflection modeling to analyze a selected set of NuSTAR spectra of Galactic black holes to obtain the most robust and precise constraints on the Kerr black hole hypothesis possible today. Our constraints are much more stringent than those from other electromagnetic techniques, and with some sources we get stronger constraints than those currently available from gravitational waves.

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Cited by 10 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Testing non-circular black hole spacetime with X-ray reflection

    gr-qc 2026-02 conditional novelty 6.0 of 10

    X-ray reflection data for EXO 1846–031 cannot distinguish the non-circular deformation parameter ℓ_NP from zero, remaining consistent with the Kerr hypothesis.

  2. Probing the Strong Gravity Region of Black Holes with eXTP

    astro-ph.HE 2025-06 conditional novelty 6.0 of 10

    eXTP's large collecting area and combined spectral, timing, and polarimetric instruments are simulated to improve black hole spin and mass measurements and to tighten tests of the Kerr metric.

  3. Impact of the returning radiation on X-ray reflection spectroscopy measurements: the case of Galactic black holes

    astro-ph.HE 2025-01 conditional novelty 6.0 of 10

    Including returning radiation in relxill does not significantly alter the best-fit parameters of three Galactic black holes.

  4. Quasi-normal modes of slowly-rotating Johannsen black holes

    gr-qc 2024-12 conditional novelty 6.0 of 10

    For slowly rotating Johannsen black holes, the deformation parameter alpha_13 dominates the quasi-normal mode shifts, and ringdown data from GW170104 bound it to be consistent with zero.

  5. Observing the eye of the storm I: testing regular black holes with LVK and EHT observations

    gr-qc 2024-11 conditional novelty 5.0 of 10

    EHT shadow sizes and LIGO/Virgo/KAGRA inspiral waveforms allow only small values of the dimensionless regularity parameter ℓ in the Ghosh-Simpson-Visser regular black hole.

  6. A Space Mission to Earth's Nearest Black Hole: Reality or Science Fiction?

    gr-qc 2026-07 conditional novelty 4.0 of 10

    An interstellar nanocraft mission to a nearby black hole is technologically speculative but potentially feasible within decades and could deliver precision strong-field tests of General Relativity.

  7. Testing Black Holes with Interstellar Missions: II. Flyby Probes

    gr-qc 2026-07 unverdicted novelty 4.0 of 10

    Flyby probes without spacecraft deceleration may still enable black-hole and GR tests beyond what Solar System observatories can achieve for the foreseeable future.

  8. An interstellar mission to the closest black hole?

    gr-qc 2025-09 conditional novelty 3.0 of 10

    If a black hole lies within about 20 light-years, a laser-propelled nanocraft could reach it in roughly a century and test Einstein's theory and event horizons.

  9. Physics and Astrophysics of Black Holes with eXTP

    astro-ph.HE 2026-07 accept novelty 2.0 of 10

    eXTP’s larger effective area and simultaneous polarimetry will tighten black-hole spin and Kerr-deviation constraints relative to NICER for the same exposure.

  10. Stellar-Mass Black Holes

    astro-ph.HE 2025-07 conditional novelty 1.0 of 10

    A concise review of stellar-mass black hole physics and observations, plus a speculative interstellar mission concept.

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