Abstract
An introduction to higher-dimensional unification is provided by a simple modern treatment of the original 5-D Kaluza–Klein ansatz. A demonstration is given of the way electric charge arises from momentum in the fifth dimension and an estimate of the radius of the extra dimension is obtained from simple quantum-mechanical considerations. The Fierz–Pauli weak-field approximation is applied and found to exhibit some of the essential features of Kaluza–Klein theory in a few lines without the need for a full general relativistic analysis.
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