While the paradigm of cosmological inflation is well established, the nature of the inflation is not known and is tackled by introduction of a hypothetical "inflaton" field.

I was wondering if there are theories or research exploring the idea that after the Big Bang the Universe had just one spatial dimension at first and therefore quite different expansion dynamics (compared to expansion along all dimensions at once), which may eliminate the need for the inflaton field. And as this simple Universe grew in size and complexity it gained the additional dimensions that slowed down the rate of expansion.

In terms of String theory this would probably mean that spatial dimensions were "rolled-up" initially and "unfolded" in stages with time after the Big Bang.


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