Re: Another dumb black hole question (charge and acceleration)

On Mar 27, 2:58 am, WizWom <wiz...@xxxxxxxxx> wrote:
On Mar 26, 3:11 am, Erik Max Francis <m...@xxxxxxxxxxx> wrote:



Shawn Wilson wrote:
On Mar 17, 12:26 pm, sigidu...@xxxxxxxxx wrote:
Black holes can carry charge.

Relativity tells us that all acceleration is the same, right? So if
we drop a proton and a neutron into a positively charged black hole,
the proton will feel less force.

This suggests that the proton would experience a different event
horizon, except that I know that's not right.

Sounds fine to me. As far as an electron (here) is concerned, the
event horizon is further from the center than it is for a proton.

Nope. The event horizon is the same for all particles; it's the region
within which the are no timelike paths back out of the surface. That's
independent of the charge on the particle.

In general relativity, gravity is not a force. It's a natural
consequence of an object moving along the shortest path through
spacetime. Potentially large electromagnetic forces on a particle don't
change when an event horizon exists or doesn't exist, since the amount
of force required to lift a particle out of a horizon _doesn't exist_ --
it is fundamentally impossible.

And Erik proves again that he is only marginally aware of things.

In this case, Mr. Francis is quite correct. Think of it this way if
you like - although there is a radius where the escape velocity for
the electron may be greater than the speed of light which is greater
than the geometrical event horizon, you could still pull the electron
away from the black hole with an outside force. Once past the event
horizon, it is impossible to retrieve the electron with any means,
outside force or no.

Luke
.

Relevant Pages

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