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Testing Regular Black Holes with X-ray data of GX 339-4

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arxiv 2306.09673 v2 pith:VGM23WZ5 submitted 2023-06-16 astro-ph.HE gr-qc

Shafqat Riaz , Michail Kyriazis , Askar B. Abdikamalov , Cosimo Bambi , Swarnim Shashank This is my paper
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keywords blackholesdataregularanalysisconstraintfeatureshole
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abstract

Regular black holes are singularity-free black hole spacetimes proposed to solve the problem of the presence of spacetime singularities that plagues the black holes of general relativity and most theories of gravity. In this work, we consider the regular black holes recently proposed by Mazza, Franzin & Liberati and we extend previous studies to get a more stringent observational constraint on the regularization parameter $l$. We study simultaneous observations of NuSTAR and Swift of the Galactic black hole in GX 339-4 during its outburst in 2015. The quality of the NuSTAR data is exceptionally good and the spectrum of the source presents both a strong thermal component and prominent relativistically blurred reflection features. This permits us to measure the regularization parameter $l$ from the simultaneous analysis of the thermal spectrum and the reflection features. From our analysis, we find the constraint $l/M < 0.44$ (90% CL), which is stronger than previous constraints inferred with X-ray and gravitational wave data.

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Cited by 3 Pith papers

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

  1. The properties and predictions of quasi-periodic oscillations around a black hole in nonlocal gravity

    gr-qc 2026-04 unverdicted novelty 5.0 of 10

    Nonlocal gravity shrinks the ISCO radius, boosts QPO frequencies, and constrains α/M ≤ 0.452 with M ≲ 43.6 M_⊙ for observed high-frequency QPOs under resonance models.

  2. Mapping Quasi-Periodic Oscillations to Lyapunov Exponent across Black Hole Thermodynamic Phase Transitions

    gr-qc 2025-10 reject novelty 4.0 of 10

    For a nonminimally coupled magnetic AdS black hole, the Lyapunov exponent and QPO frequencies both reproduce the swallowtail branch structure of the Van der Waals-like thermodynamic phase transition.

  3. 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.

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