Can any force other than gravity produce an event horizon?

Question

For example, if there's a concentration of electric charge such that the escape speed for an oppositely charged test particle at a given distance is greater than the speed of light, does an event horizon exist for such particles?

Would like-charged particles get repelled so hard that they'd have a speed greater than c at infinity?

I wonder whether it would take infinite energy to assemble a 1 solar mass "proton star." Assuming that one were assembled, there'd be a radius around it for which the escape speed of a negative test particle was the speed of light. At that radius, you'd have to impart to an electron infinite energy before it could escape from the proton star.

Now, of course, the proton star is going to explode. But will it explode with infinite energy, if, um, not more? And, if so, then wouldn't it take infinite energy, if not, um, more, to assemble a proton star?

If you could keep pushing protons into a black hole, sooner or later the Coulomb repulsion on a test proton would equal the gravitational attraction at the event horizon, and presumably everywhere else, and a proton would be inertially indifferent to the black hole's presence.

Answer 1

Hmm, the eclectic charge idea would probably not work because of the columb repulsion. But, then again..if maybe if you have black whole in the center of a huge collection of protons which were inside of the event horizon it may be possible. Because the protons will not have sufficient energy to escape the event horizon so it maybe possible to keep packing these protons in. I dont have anything for you about the other forces sorry.....this question is a good one.

For your second question, even if you had a huge repelling force it wont be large enough to repel particles faster than the speed of light or even at the speed of light for that matter. For that you will need infinite energy.

Answer 2

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Answer 3

A magnetic force has an event horizon also.
I am not sure about the concentrations of particles one. But my guess on that is yes.

Answer 4

No.