[ExI] Black hole brains (was Re: taxonomy for fermi paradox fans)

Flexman, Connor connor_flexman at brown.edu
Mon Feb 23 22:30:55 UTC 2015

On Mon, Feb 23, 2015 at 2:46 PM, Stuart LaForge <avant at sollegro.com> wrote:

> Perhaps the time period between a civilization developing recursively
> self-improving general AI and its subsequent development of computronium is
> relatively short compared to geologic time scales. Computronium, being the
> maximally optimized medium for computation, quickly saturates the
> Beckenstein bound of their region of space-time by being so information
> dense. This causes their space-time to warp to the point of pinching itself
> off, forming an event horizon around them. This effectively renders the
> civilization a black hole to those observers still in comparatively flat
> space-time meaning that since no information can escape the event horizon,
> no civilization outside the black hole can detect the civilization inside
> the black hole.
> Meanwhile, inside the black hole, the post-singularity civilization
> effectively exists in its own universe, with mass-energy and information
> continually pouring in from the outside. Thus, limited perhaps to
> competition between like civilizations, the civilization in question can
> grow to massive proportions becoming a Kardeshev scale type 3 civilization,
> controlling their galaxy by becoming the billion solar mass black hole
> galactic nucleus. Thereby secretly ruling a galaxy without ever leaving
> home.

I think the downside to this proposal is that inside a black hole's event
horizon, all paths through spacetime point radially inward. Then not only
would they only be able to receive information from the outside world but
not give any, but they also would only be able to receive information from
people outside their radial distance, and not communicate information back
out to them.

Also note that present consensus generally seems to favor that information
can indeed leave the event horizon, for information is not destroyed.

Anyone with better knowledge of information theory than I have: what is the
relationship between computronium, the Bekenstein limit, and black holes?
Are all three reached at the same point? Don't other limits to computation
halt the amount of information we can cram into computronium before we
reach the Bekenstein limit and create a black hole?

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