Science is based on evidence. There is no evidence for multi-dimensional universes, multiple big bangs followed by big crunches, or anything at all beyond 13 and a fraction billion years ago.
Whatever is said about those things is not science at all. It is baseless speculation. Many have some kind of a love affair with mathematics, thinking that if something is mathematically consistent, it must be true. It is true that baseless speculation can set you on a course of investigation to find the true nature of things. But it is not true that reality must yield to the power of baseless speculation.
Well, that is false. Mathematics is a descriptive language, like English or German. All three languages have the ability to describe internally consistent falsehood as well as truthfulness. Imagine the foolishness of saying "It is said in English (or German) so it MUST be true." Nobody would buy that bag of horse squeezings. But they write a blank check to mathematical theory. It is utter foolishness.
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