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Galaxies 2018, 6(4), 107; https://doi.org/10.3390/galaxies6040107

Testing the Anomalous Growth of the Black Hole Radius from AGN

Center for Field Theory and Particle Physics, Department of Physics, Fudan University, Shanghai 200433, China
These authors contributed equally to this work.
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Received: 18 July 2018 / Revised: 17 September 2018 / Accepted: 20 September 2018 / Published: 3 October 2018
PDF [417 KB, uploaded 3 October 2018]

Abstract

We analyze constraints on the anomalous growth of the black hole radius or the black hole spin from the X-rays spectrum data of Active Galactic Nuclei (AGN) in NGC 5506. The anomalous growth of the mass or of the spin of a black hole may be unveiled within the framework of models of alternative gravity, including f ( R ) -gravity. Our phenomenological analysis is based on an effective parametrization for the black hole Kerr metric, which is inspired by the antievaporating solutions discovered by Nojiri and Odintsov. We find tight constraints on the parameter space of anomalous metrics. Intriguingly, we find that a more than secularly growing solution can better fit current data. Our result opens a pathway towards a new phenomenological approach for testing predictions of general relativity and alternative theories of gravity.
Keywords: alternative gravity; black holes; gravitational instabilities; AGN physics alternative gravity; black holes; gravitational instabilities; AGN physics
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Addazi, A.; Marciano, A.; Qian, C. Testing the Anomalous Growth of the Black Hole Radius from AGN. Galaxies 2018, 6, 107.

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