Extra dimensions

Several speculative physical theories have introduced extra dimensions of space for various reasons:

Kaluza-Klein theory introduces extra dimensions to explain the fundamental forces other than gravity (originally only electromagnetism).
Large extra dimension and the Randall–Sundrum model attempt to explain the weakness of gravity. This is also a feature of brane cosmology.
The extra dimensions in superstring theory are required for mathematical consistency and are often assumed to have the shape of a Calabi–Yau manifold.
Universal extra dimension ...

"Extra dimensions" may also refer to:

Parallel universe (fiction)

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