The Isotropy Problem: Why is the Microwave Background so uniform?
The Flatness Problem: Why is Ω0=1?•In order for the universe to be as flat as is today, the value of Ωright after the Big Bang must have been equal to 1 with more than 50 decimal places! How can it be fine-tuned so precisely?• If Ω> 1=> would have collapsed rapidly!• If Ω< 1=> would have expanded so rapidly that matter could never have clumped together to form galaxies!•Either case, we would not be here…
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The newborn universe may have undergone a brief period of vigorous expansion•A brief period of rapid expansion, called inflation, is thought to have occurred immediately after the Big Bang•During a tiny fraction of a second, the universe expanded to a size many times larger than it would have reached through its normal expansion rate•Do not mistake inflation for the expansion of the