Applicability of the Newman-Janis algorithm to black hole solutions of modified gravity theories

Hansen, Devin; Yunes, Nicolás

doi:10.1103/physrevd.88.104020

Cited by 67 publications

(52 citation statements)

References 44 publications

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“…Thus, for any approximation of the functions h t ðrÞ and h r ðrÞ, the slowly rotating regime of the dilaton black hole is not reproduced by the metric (A4). Similar arguments were used to show that the Newman-Janis algorithm is not able to generate rotating black-hole solutions in modified gravity theories [35].…”

Section: Appendix: Johannsen-psaltis Parametrization For the Dilaton mentioning

confidence: 92%

New parametrization for spherically symmetric black holes in metric theories of gravity

2014

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We propose a new parametric framework to describe in generic metric theories of gravity the spacetime of spherically symmetric and slowly rotating black holes. In contrast to similar approaches proposed so far, we do not use a Taylor expansion in powers of M=r, where M and r are the mass of the black hole and a generic radial coordinate, respectively. Rather, we use a continued-fraction expansion in terms of a compactified radial coordinate. This choice leads to superior convergence properties and allows us to approximate a number of known metric theories with a much smaller set of coefficients. The measure of these coefficients via observations of near-horizon processes can be used to effectively constrain and compare arbitrary metric theories of gravity. Although our attention is here focussed on spherically symmetric black holes, we also discuss how our approach could be extended to rotating black holes.

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Section: Appendix: Johannsen-psaltis Parametrization For the Dilaton mentioning

confidence: 92%

New parametrization for spherically symmetric black holes in metric theories of gravity

2014

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“…Pirogov put forward that rotating metrics obtained from the JN algorithm in Brans-Dicke theory are not solutions if α = 1 [51]. Similarly Hansen and Yunes have shown a similar result in quadratic modified gravity (which includes Gauss-Bonnet) [52]. 4 These do not include Sen's dilaton-axion black hole for which α = 1 (section 6.4), nor the BBMB black hole from conformal gravity (section 6.2).…”

Section: The Janis-newman Algorithmmentioning

confidence: 99%

Janis–Newman Algorithm: Generating Rotating and NUT Charged Black Holes

Erbin

2017

Universe

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Abstract:In this review we present the most general form of the Janis-Newman algorithm. This extension allows generating configurations which contain all bosonic fields with spin less than or equal to two (real and complex scalar fields, gauge fields, metric field) and with five of the six parameters of the Plebański-Demiański metric (mass, electric charge, magnetic charge, NUT charge and angular momentum). Several examples are included to illustrate the algorithm. We also discuss the extension of the algorithm to other dimensions.

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“…However, it is not guaranteed that such an algorithm works beyond general relativity. In the literature there are some examples in which the algorithm works [55][56][57], as well examples in which it fails [58]. It is thus unclear whether a parametrization based on the Newman-Janis algorithm can be employed to test astrophysical black holes.…”

Section: Konoplya-rezzolla-zhidenko Parametrizationmentioning

confidence: 99%

Testing the Kerr metric with the iron line and the KRZ parametrization

Jiang

Bambi

2016

J. Cosmol. Astropart. Phys.

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Abstract. The spacetime geometry around astrophysical black holes is supposed to be well approximated by the Kerr metric, but deviations from the Kerr solution are predicted in a number of scenarios involving new physics. Broad iron Kα lines are commonly observed in the X-ray spectrum of black holes and originate by X-ray fluorescence of the inner accretion disk. The profile of the iron line is sensitively affected by the spacetime geometry in the strong gravity region and can be used to test the Kerr black hole hypothesis. In this paper, we extend previous work in the literature. In particular: i) as test-metric, we employ the parametrization recently proposed by Konoplya, Rezzolla, and Zhidenko, which has a number of subtle advantages with respect to the existing approaches; ii) we perform simulations with specific X-ray missions, and we consider NuSTAR as a prototype of current observational facilities and eXTP as an example of the next generation of X-ray observatories. We find a significant difference between the constraining power of NuSTAR and eXTP. With NuSTAR, it is difficult or impossible to constrain deviations from the Kerr metric. With eXTP, in most cases we can obtain quite stringent constraints (modulo we have the correct astrophysical model).

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Applicability of the Newman-Janis algorithm to black hole solutions of modified gravity theories

Cited by 67 publications

References 44 publications

New parametrization for spherically symmetric black holes in metric theories of gravity

New parametrization for spherically symmetric black holes in metric theories of gravity

Janis–Newman Algorithm: Generating Rotating and NUT Charged Black Holes

Testing the Kerr metric with the iron line and the KRZ parametrization

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