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In the beginning (not trying to sound biblical) there was a singularity which was highly ordered (very low entropy). 1 second later there was a massively expanding universe which now had a much higher entropy. Since the 2nd law of thermodynamics dictates that entropy can only increase over time, would that not mean that the universe can only expand as time passes? (This is perhaps where my biologist's view may come unstuck). I know that this is not directly concerned with acceleration of the universe, but it has just always struck me that in the days when it was believed that the universe may eventually stop expanding , or even begin to implode/shrink, wouldn't the 2nd law of TD have been there saying, hey dudes, entropy always increases and therefore a shrinking universe appears unlikely/impossible.
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The idea of starting from a singularity is an old idea that was dismissed some time ago. I would recommend Lawrence Krauss "A universe from nothing" as a good read which will adress your issues, or if you want the short story he has several 1 hour lectures on this subject on utube.