English

Proper noun

Kaluza-Klein theory ‎(plural Kaluza-Klein theories)

1. (physics) A model (not believed to be literally true) developed by physicists Theodor Kaluza and Oskar Klein that attempted to combine gravity and electromagnetism by adding a fifth dimension to our four-dimensional spacetime.
2. (physics) Any of a number of theories that try to explain forces by adding extra dimensions to our spacetime.