[ExI] for the fermi paradox fans

[Anders Sandberg]

Robin D Hanson <rhanson at gmu.edu> , 7/6/2014 6:20 PM:
  I know that people often say things like this, but I think it gets the physics wrong. The real resource is negentropy. One just stores that in a form of free energy, but how many bits one can erase later with that negentropy doesn't depend on the temperature  later, at least to first order. One will want to do reversible computing later, and that isn't necessarily much more efficient at lower temperatures.
Hmm... how does this actually work? You make a lot of negentropic stuff, and when you need to erase a bit in a late era you use the negentropy to mop up the bit entropy? But the energy cost of making the negentropy/free energy stuff in the early era seems to be significant. 


Anders Sandberg, Future of Humanity Institute Philosophy Faculty of Oxford University
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