Re: SETI/ASTRO: MBrains/JBrains & Globular Clusters

From: Eugene Leitl (
Date: Tue Jul 17 2001 - 05:00:31 MDT

On Mon, 16 Jul 2001 wrote:

> The 10^12 kg threshold for Hawking radiation/evaporation to be significant
> would correspond to roughly a kilometer-sized chunk of rock, something
> for which a gravitational signature would normally be undetectable.
> So if you can see effects of its gravity, it could always be a black
> hole in a shell, and Hawking evaporation will not be an issue.

Hal, can you look up the hole mass and power radiated for a ~10 kK

Apart from the spectral composition (you could use a gas or matter shell
for attenuation) and the total power radiated the interesting problem
would be feeding the thing, preventing it from evaporative runaway. If
they're too small, you can't feed them very efficiently (and of course you
can't come too close).

-- Eugen* Leitl <a href="">leitl</a>
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