## Kaluza-Klein theory

Ka·lu·za-Klein theorynoun

- A theory that seeks to unify the force of electromagnetism as described by Maxwell's equations and the force of gravity as described by general relativity, explaining each as manifestations of a single fundamental force and introducing a hypothetical fifth dimension.
- Any of various physical theories introducing dimensions additional to the four dimensions of space and time.

Origin of Kaluza-Klein theory

*After Theodor*

*Kaluza*

*(1885-1954), German mathematician and physicist*

*and Oskar*

*Klein*

*(1894-1977), Swedish physicist*

## kaluza-klein-theory

Proper noun

(*plural* Kaluza-Klein theories)

- A theory (no longer accepted) 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.
- Any of a number of theories that try to explain forces by adding extra dimensions to our spacetime.