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Thought experiment proposed to reconcile psychological versus thermodynamic arrows of time:
A pair of physicists has proposed a thought experiment to help reconcile the seeming disparity between the psychological and thermodynamic arrows of time. In their paper published in the journal Physical Review E, Leonard Mlodinow and Todd Brun claim their thought experiment demonstrates that the two seemingly contradictory views of time, must always align.
When ordinary people think about time, they see the past as something that has come before and the future as a great unknown yet to come. We can remember the past, because it has happened already, but not the future, because it hasn't. Physicists, on the other hand see time as able to move either forward or backwards (towards greater entropy), which implies that we should be able to remember events in the future. So, why can't we?
It's because of the way our memories work the two say, and they've created a thought experiment to demonstrate what they mean. Imagine, they write, two chambers connected by an atomic sized tube with a turnstile in it. If there is gas in one of the chambers, individual atoms of it will move through the tube to the other chamber (towards higher entropy) tripping the turnstile as they go, in effect, counting the atoms as they pass by, until both sides have equal numbers of atoms-creating a state of equilibrium.
http://phys.org/news/2014-05-thought-psychological -thermodynamic-arrows.html
http://physics.aps.org/articles/v7/47
http://journals.aps.org/pre/abstract/10.1103/PhysR evE.89.052102
(Score: 3, Informative) by Gaaark on Tuesday May 06 2014, @03:28PM
Again, I point to the work of Julian Barbour and others who are trying to separate Time from Space (as Einstein originally had his thinking and as Mach thought).
Time is emergent from movement through space, not an inseparable part of space; the 'arrow' of time moves only in the one direction.
Etc.
http://platonia.com/ [platonia.com]
--- Please remind me if I haven't been civil to you: I'm channeling MDC. ---Gaaark 2.0 ---
(Score: 1, Interesting) by Anonymous Coward on Tuesday May 06 2014, @05:38PM
Time is emergent from movement through space
Time is because c is finite.
Time as we know it, exists because it takes light certain "time" to reach from point A to point B. If communication was instant, then everything would happen at once. Things like chemical reactions would be instant. It (almost) does not matter what the value of c is, as long as it is finite.