Kaluza–Klein theory
Unified field theory
Kaluza–Klein theory
In physics, Kaluza–Klein theory (KK theory) is an attempt at creating a unified field theory of gravitation and electromagnetism based on the idea of a fifth dimension of space beyond the conventional four-dimensional spacetime of general relativity. According to this proposal, there are three dimensions of space and one of time but with an additional spatial dimension in the shape of a tiny circle. The Kaluza-Klein theory is named after Theodor Kaluza and Oskar Klein. It is not supported by experiments, but is a precursor to supergravity and modern string theory (in eleven-dimensional spacetime).
Read on Wikipedia · Image Lucas Taylor / CERN, CC BY-SA 3.0
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