Scalar fields {moduli, string} {modulus, string} cause curled-up-dimension shapes and sizes.
Modulus parameters determine Calabi-Yau spaces, but modulus can go to zero {moduli problem}.
Gravity can be in all space dimensions, including non-infinite high-curvature dimensions {Randall-Sundrum model}, making gravity weak compared to other forces, which are not in curled-up dimensions.
5-Physics-String Theory-Dimensions
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Date Modified: 2022.0225