| Kaluza-Klein theory | has definition Class of theories incorporating extra curled-up dimensions, together with quantum mechanics. |  |
| has definition An early attempt to unify general relativity and electromagnetism by working in five dimensions. The electromagnetic field was obtained by curling up or compactifying the extra dimension. With the advent of higher dimensional theories such as superstrings, the Kaluza-Klein approach came back into fashion. | |
| is a kind of unified theory | |
| is a kind of unified theory | |
| theory | has validity correct or incorrect with caveats | |
| has author or reasearch group | |
| has domain a field of research | |
| has date or a range of dates for which the theory was active | |
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