Crown-Horned Snorkack wrote:
> On 1 apr, 05:35, Erik Max Francis <m...@[EMAIL PROTECTED]
> wrote:
>> However, since extremal black holes require charge and mass ratios that
>> are perfectly balanced (and enormous), they are unstable,
>
> Towards what?
Towards being non-extremal?
>> I do not believe you can make a non-extremal Reissner-Nordström into an
>> extreme one by adding charge, though I might be mixing that up with
Kerr
>> black holes and adding angular momentum. (I think they're all part of
>> the same case with Kerr-Newman holes, though.)
>
> But technically, you could asymptotically approach an extremal hole,
> right?
It's unclear what "technically" you're going for here. Extremal holes
do not have a horizon. Non-extremal holes do have a horizon. If you
want to view that asymptotically, I suppose you're welcome to, but it
still means that all real Reissner-Nordström holes have an event horizon.
> The properties of 1 solar mass Schwarzschild black hole are well
> known. Its Schwarz****ld radius is 1,48 km. And its gravitational
> field, at larger distances, is indistinguishable from the field of an
> extended object of the same mass.
>
> What is the charge of an 1 solar mass extremal Nordström black hole?
> What would be the electiric field strength at 1 a. u.?
1.719 x 10^20 C, which is an awful lot (1 C is already a huge charge
unit in human terms). At 1 au, that would result in an electric field
strength of 68.7 MN/C.
--
Erik Max Francis && max@[EMAIL PROTECTED]
&& http://www.alcyone.com/max/
San Jose, CA, USA && 37 18 N 121 57 W && AIM, Y!M erikmaxfrancis
My land's only borders lie / Around my heart
-- The Russian, _Chess_
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