> > Right. It's generally thought that the direction of increasing entropy is > defined by the expansion of the universe since the expansion increases the > available states for matter. But it's hard to show that this must also > determine the radiation arrow of time.On the contrary, no physicist I have seen talking about the arrow of time believes that it's defined by the direction of expansion--in fact, many of them make a point of saying that idea doesn't work because if the universe is sufficiently dense that it begins to contract again at some point in the future, there's no reason to expect the arrow of time to suddenly reverse in the contracting phase.Jesse
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Received on Sun Jan 25 2009 - 00:15:57 PST