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The movie "Prince of Darkness" used the idea of tachion transmissions as a means by which 'information' (in this case a radio transmission) could be streamed into the past.


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I like to think if it as connected to potential in the way described below, but transmitting or otherwise erasing it might be called kinetic energy. The one thing for sure is that there is a minimal entropy generated when a bit is erased. Landauer's principle says at least kT ln(2) energy must be lost as heat when a bit is erased. At least k ln(2) entropy ...


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I only have a small comment to make on this topic. I think rather than use the word " subjective" it would be more exact to say that entropy is arbitrary, in the sense that, the value of entropy for your system depends on the variables you use to describe your macrostate, but once the choice is made, then the entropy is determined by the objective forces you ...


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I just want to amplify on what @Travis said and let me quote "Jaynes: Gibbs vs Boltzmann Entropies" who credits Wigner for this concept of THE "ANTHROPOMORPHIC" NATURE OF ENTROPY "...After the above insistence that any demonstration of the second law must involve the entropy as measured experimentally, it may come as a shock to realize that, nevertheless, ...


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You have a few confused ideas here- which is quite normal, because it is a confusing subject that is often not described very well. Instead of addressing them all specifically, I will answer the central question: Entropy is objective. It is true that one must specify exactly what degrees of freedom are in and out of your system to say what the entropy is. ...


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Entropy is subjective in the sense that you get to pick which macroscopic observables you care about keeping track of (usually, for instance, you care about things like temperature, pressure, etc.). Once you've defined the macroscopic observables, entropy is defined as the logarithm of the number of possible microstates that give rise to those macroscopic ...



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