ratiocinator
Lightly seared on the reality grill.
There are also models that don't require a contraction phase but are nevertheless cyclic, either as a series of similar 'eons' (Conformal Cyclic Cosmology) or as an actual loop (Periodic Time Cosmology).More than three, I'd say. Another proposal is that it's cyclical, that the expansion of the universe reverses for some unspecified reason and everything shrinks back to single point followed by another Big Bang, hence that it exists in a multidimensional circular form not needing a beginning or end.
Conformal cyclic cosmology - Wikipedia
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