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General relativistic formulas for mass and spin of a Kerr black hole in terms of redshifts and orbital parameters

We derive closed formulas for the mass and spin parameters of a Kerr black hole in terms of a minimal quantity of observational data: the red-/blue-shifts of photons emitted by massive particles (stars) moving on geodesics around the black hole and their respective orbital radius. It turns out that given a set of two (three) stars revolving around the black hole, these formulas involve just eight (twelve) observational data. For the case of a single star orbiting the black hole we need a minimal set of four observational measurements to analytically determine both parameters.

preprint2021arXivOpen access
Alfredo Herrera-AguilarRaúl Lizardo-CastroUlises Nucamendi
gr-qc
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Open access3 authors1 topic
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Alfredo Herrera-AguilarRaúl Lizardo-CastroUlises Nucamendi

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