Why the cosmological horizon? The CMB is at 2.7degK, which is waaay
hotter than any black hole you're likely to find. So you can just put
a heat engine between the CMB and the BH.
Brent
On 4/8/2019 12:29 PM, Mason Green wrote:
Here’s another idea I just came up with, that doesn’t harness dark energy
itself so much as the Hawking radiation of the de Sitter horizon.
A civilization could build a sphere around a cold black hole (I.e., a rotating
or charged black hole whose Hawking temperature is lower than that of the
cosmological horizon; such a black hole would need to be very close to
extremal).
The sphere would catch the Hawking radiation from the cosmological horizon, and
then feed some of it into the black hole in such a way as to further decrease
its temperature (by pushing it closer to extremality). The sphere could use the
rest of the energy for its own needs. The black hole and the sphere would keep
growing over time.
-Mason
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