interesting thread.
I'll throw in a contribution by the particle physicist Victor Stenger that I found particularly intriguing (though I am not a physicist and am not qualified to intelligently respond to his thought)... basically he pointed out in an essay that the entropy argument became outdated about 100 years ago, when we discovered that the universe is expanding... he stated, in part:
"This actually was a legitimate question a hundred years ago, when we thought that the Universe was a firmament, but now we know that the Universe is expanding. An expanding universe leaves increasingly more space for order to form.
"An example I like to give on this, is, suppose that you have a very small yard, and every day you take your rubbish and you dump the rubbish into the yard. Eventually it's going to cover up those petunias that you plotted over there in your garden, and your yard is going to become very disordered. How can you, then, get some more petunias growing? Well, what you can do is buy the land around your yard. Then you have more space and you can plant some petunias. As time goes on, of course, you keep dumping the rubbish and it fill up the space, you've got to keep buying more and more land. But, in principle, you can do it that way; you can always have some space left over. As long as the Universe continue to expand, in other words, there's always room for more order to form."
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Perhaps it is important to remember that the universe is not expanding quite like we usually picture - like an explosion - but more like a rubber band - where everything is stretching - where the expansion is more than a simple expression of projectile motion but more of a elemental and continuing change (most dramatic in the early universe, but still continuing) where space itself expands (more than in 3 dimensions, I imagine)... I am at my limits as far as conceiving how particle physicists view this expansion, but apparently it is an on-going creation of potential energy or something like that (???). Anyway... I definitely do not think we need some explanation like this to deal with krellin's entropy question... I agree with the others that the current Big Bang theory as we commonly conceive it has no problem dealing with the question without getting into Dr. Stenger's model. But on the other hand, maybe this is the way physicists normally look at it and us non-physicists regularly get it wrong (way-over-simplified and overly Newtonian).