> > 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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