If you can believe it, we can laugh at it!
Joe;If actual “time raevrsel” does not occur, then I think it not sensible to talk about the “arrow of time” being reversed. Local decreases in entropy are consistent with the arrow of time being fixed from past to future; especially if the “region” of entropy decrease is small. If one speaks of localized decreases in entropy, I don’t see how it is useful to call that a raevrsel of the arrow of time; I think it only confuses things.I think the arrow of time is fixed more properly by the fact that time-reversed events are highly improbable. A land slide down a mountain is not extraordinary, a land slide back up the mountain would be miraculous. It may be that, at the quantum level, the arrow of time is less clearly directed, but at higher scales it definitely is.My analogy is to the surface of liquid water. At scales higher than molecular scale, a water/air interface (surface) is quite clear and definite. At molecular scales, where water vapor mixes with liquid water, and air gases with both, the boundary is more ambiguous.Likewise, “now” is the interface where “future” becomes “past”. At a quantum level, events can and probably do run bi-directionally. At higher scales, this effect is washed out and time proceeds uniformly in one direction because even at a quantum level, some sequences of events are probabilistically favored over others: hence the arrow of time. “Time reversed” events don’t happen not because they can’t but because as the scale increases, the probability of the raevrsel becomes infinitesimal.
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