Inflation and baby universes

  • Thread starter dude01
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I really enjoyed Sean Carroll's book "From Eternity to here" and his explanation about the connection of the arrow of time and the low-entropy event which is called big bang.

There is something I did not understand though. He stated that inflation is not an explanation for the low-entropy beginning as entropy was even lower before. On the other hand, he proposed a scenario where baby universes are created and then blown-up by inflation (and also our universe).

I ask myself though why it should not be possible that inflation created the current state "on top" of a universe that was already in a de-sitter vacuum state. Entropy would still increase while new matter is created by the inflation process. Also, as inflation expands so fast a tiny region fluctuating into the the high-energy inflational state anywhere could be sufficient to shape a universe like ours.

As there was basically "nothing" there before (just de-sitter vacuum), could such a scenario be even distinguished from one where the universe is created "from scratch" with inflation (e.g., from the baby universes)?

thanks for your answer!
Oliver Mattausch
 

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Chalnoth
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I ask myself though why it should not be possible that inflation created the current state "on top" of a universe that was already in a de-sitter vacuum state. Entropy would still increase while new matter is created by the inflation process. Also, as inflation expands so fast a tiny region fluctuating into the the high-energy inflational state anywhere could be sufficient to shape a universe like ours.
This is basically the idea that Sean Carroll and Jennifer Chen proposed:
http://arxiv.org/abs/hep-th/0410270
 

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