RE: Hole in a box

From: Emlyn O'regan (
Date: Mon Feb 18 2002 - 15:45:33 MST

Amara wrote, amongst other things...
> To power the energy output of a quasar (10^{47} erg/sec), assuming
> an efficiency mass conversion via a swirling accretion disk of 10%,
> would require swallowing more than 10 M_solar per year.

Well, by now I'm pretty well lost !

What I was originally asking, btw, was whether the concept of a dyson sphere
(or cloud, or m-brain variant, or some other derivative of the
shell-enclosing-power-source concept), would make sense using a black hole
(into which you throw a lot of stuff), rather than the traditional star.
>From the above, I _think_ that I can assume that it could make sense,
assuming one has such astronomical (!) amounts of matter to play with, and
would prefer a lot of energy to a lot of matter.

Here, I'm thinking of an SI which is burning its candle at both ends, so to
speak. Why not?

(also, I'm not criticising the direction the thread has taken... awesome
effort, everyone! I'll take some time out to read it all properly and try to
absorb it, then drop down into Amara's links)

Confidentiality: The contents of this email are confidential and are
intended only for the named recipient. If the reader of this e-mail is not
the intended recipient you are hereby notified that any use, reproduction,
disclosure or distribution of the information contained in the e-mail is
prohibited. If you have received this e-mail in error, please reply to us
immediately and delete the document.
Viruses: Any loss/damage incurred by using this material is not the sender's
responsibility. Our entire liability will be limited to resupplying the
material. No warranty is made that this material is free from computer virus
or other defect.

This archive was generated by hypermail 2.1.5 : Fri Nov 01 2002 - 13:37:40 MST