Time\'s Arrow (General)

by David Turell , Thursday, April 17, 2014, 16:35 (3871 days ago) @ George Jelliss

George: Time's Arrow is due to quantum entanglement
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> https://www.simonsfoundation.org/quanta/20140416-times-arrow-traced-to-quantum-source/&... 
> In the new story of the arrow of time, it is the loss of information through quantum entanglement, rather than a subjective lack of human knowledge, that drives a cup of coffee into equilibrium with the surrounding room. The room eventually equilibrates with the outside environment, and the environment drifts even more slowly toward equilibrium with the rest of the universe. The giants of 19th century thermodynamics viewed this process as a gradual dispersal of energy that increases the overall entropy, or disorder, of the universe. Today, Lloyd, Popescu and others in their field see the arrow of time differently. In their view, information becomes increasingly diffuse, but it never disappears completely. So, they assert, although entropy increases locally, the overall entropy of the universe stays constant at zero.-Wonderful article, George, but as usual in quantum philosophy it makes interesting conjectures and explains little, as this from the aticle shows:-"The backdrop for the steady growth of entanglement throughout the universe is, of course, time itself. The physicists stress that despite great advances in understanding how changes in time occur, they have made no progress in uncovering the nature of time itself or why it seems different (both perceptually and in the equations of quantum mechanics) than the three dimensions of space. Popescu calls this "one of the greatest unknowns in physics.""-To paraphrase Feynman: anyone who tells you he understands quantum theory is lying.