Questions tagged [kerr-newman-metric]

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22 questions
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Area of Kerr-Newman event horizon

I want to calculate the area of event horizon for a Kerr-Newman black hole by using boyer's coordinates. I searched a lot from web, but I could not find any information about calculating event ...
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Metric diameter of a ring singularity

In the Kerr metric the ring singularity is located at the coordinate radius $r=0$, which corresponds to a ring with the cartesian radius $R=a$. So the center of the ring singularity in cartesian ...
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Would naked singularities have a complex irreducible mass?

The formula for the irreducible mass, also known as the Christodoulou and Ruffini equation, is $$M_{\rm irr} = \frac{\sqrt{2 M^2-Q^2+2 M \sqrt{M^2-Q^2-a^2}}}{2}$$ where M is the mass equivalent of ...
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Near Horizon Vector Field

I am studying this paper https://arxiv.org/pdf/0811.4393.pdf. I find a probem to find the near horizon form of the vector (2.17) and electromagnetic (2.18) field. I have tried to use the near horizon ...
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Are electrons points or Kerr naked ring singularities?

I have heard contradictory descriptions of electrons as both points and kerr naked ring singularities, with that said which is it? Are they rings or are they points? Are they somehow both?
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