Abstract
The chapter reviews the two approaches to test the Kerr black hole hypothesis with electromagnetic radiation. In the top-bottom approach, we employ a non-Kerr black hole solution from a certain alternative theory of gravity and we check whether it can better explain observational data than the Kerr metric. In the bottom-up approach, we consider instead a phenomenological parameterization of the metric, which ideally should be able to describe the spacetime of any possible black hole in any possible gravity theory.
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Notes
- 1.
The expression total angular momentum is used to indicate the angular momentum computed as the Komar integral associated to axisymmetry at spatial infinity.
- 2.
The data files are available at http://gravitation.web.ua.pt/index.php?q=node/416.
- 3.
That is, we have rescaled, in this discussion, \(\mu r_\mathrm{H} \rightarrow r_\mathrm{H}\), \(\varOmega _\mathrm{H}/\mu \rightarrow \varOmega _\mathrm{H}\), \(\mu M\rightarrow M\) and \(\mu ^2 J\rightarrow J\). Let us note that any solution can have any physical mass for an appropriate choice of \(\mu \).
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Bambi, C. (2017). Non-Kerr Spacetimes. In: Black Holes: A Laboratory for Testing Strong Gravity. Springer, Singapore. https://doi.org/10.1007/978-981-10-4524-0_12
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