Re: Hole in a box

From: Eugene Leitl (
Date: Fri Feb 15 2002 - 05:18:48 MST

On Thu, 14 Feb 2002, Anders Sandberg wrote:

> I don't know. I'm not enough of a physicist to tell. My intuition tells

The hole is but a pinprick (sub um sized?); what is the size of the
accretion disk? Probably palm-sized, certainly <<1 m. You would want to
not ionize the fuel (hydrogen? helium?).

Could somebody please plug in the numbers into the equations for a 10 kK
hole, to get an order of magnitude estimation? I.e., the size of the event
horizon, the total hole luminosity, plus a guesstimate of the accretion
disk, given gravitation gradient and a hydrogen atmosphere?

> me the assumption of equilibrium is not to be trusted at all - I can
> easily imagine instabilities that cause radial convection. Of course,
> using a black hole as a heat engine this way might be a practical
> engineering solution, but it is so crude. I prefer machines with no
> moving parts.


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