Why is a black hole with q>e singular?

Loren Booda
Black holes have the properties of angular momentum, mass, and charge. Since electromagnetism is a much stronger inverse-square force than gravity, and like charges repel, wouldn't a black hole with charge q>e avoid singularity?

Gold Member
No, this is how a black hole is formed, i.e. the gravitational pull of the star becomes greater than the degenracy pressure caused by electromagnetism and the like.

Loren Booda
Even when a mass is collapsed beyond degeneracy to neutronium, any net charge its eventual "singularity" harbors still retains the property of predominant repulsion.

Creator
Originally posted by Loren Booda
Black holes have the properties of angular momentum, mass, and charge. Since electromagnetism is a much stronger inverse-square force than gravity, and like charges repel, wouldn't a black hole with charge q>e avoid singularity?

Well Loren,..who says inverse square law holds true inside a singularity?

Creator

Loren Booda
Creator,
One must achieve the singularity first. In other words, can you derive a minimum net charge/mass relation for collapsing matter to attain a black hole?

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Creator
Originally posted by Loren Booda
Creator,
One must achieve the singularity first. Is there a minimum net charge/mass for attaining a black hole?

Beats me; I've not heard of such a calculation. However, even before going singular 1/r^2 likely becomes deficient.

Creator

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bogdan
What does q>e mean ?

Gold Member
Originally posted by Loren Booda
Creator,
One must achieve the singularity first. In other words, can you derive a minimum net charge/mass relation for collapsing matter to attain a black hole?

There is no minimum mass needed for a black hole (though obviously one formed by steallr evolution has a minimum mass)and charge doesn't enter into it.

Loren Booda
bogdan, q>e means the net collapsing discrete charge, q, is at least 2 times the electon charge, e, in order for like charges to repel.

jcsd, the minimum mass for a black hole is M*, the Planck mass. This quantity derives from the absolute radiative constants c, G and h. Only quanta or their composites weigh less.