Note on a new parametrization for testing the Kerr metric

Understand

We propose a new parametrization for testing the Kerr nature of astrophysical black hole candidates.

• The common approaches focus on the attempt to constrain possible deviations from the Kerr solution described by new terms in the metric.
• Here we adopt a different perspective.
• The mass and the spin of a black hole make the spacetime curved and we want to check whether they do it with the strength predicted by general relativity.