On 12/3/2013 6:17 PM, freqflyer07281972 wrote:
Hey everyone,
Here is a question for Bruno (and anyone else who wants to chime in) --
I came across this post
<http://www.preposterousuniverse.com/blog/2013/11/28/thanksgiving-8/> over at Sean
Carroll's Preposterous Universe blog, wherein he seems to be claiming that the
relationship between information, entropy, and physical processes is pretty well in the
bag, i.e. it is well understood by physicists
and it seems that the concept of information can be cashed out entirely in terms of
physical processes.
But if the processes are reversible (and they can be) then there is no entropy increase
and no heat. Feynman already outlined how this would have to be done in quantum computers.
I think the problems are far from solved. Black holes, in the semi-classical
approximation seem to destroy information and there are various proposals for preserving
the unitary evolution of quantum mechanics, but none that are completely satisfactory.
Brent
What does this do to your thought experiment and your Platonic orientation towards
questions of information theory?
How would you go about explaining the deep relationship between entropy, information,
and the physical evolution of the universe?
Cheers,
Dan
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