KKReduktionen
KKReduktionen, or Kaluza-Klein reduction, is a method in higher-dimensional field theories for deriving a lower-dimensional effective theory by compactifying the extra spatial dimensions on a small, compact manifold. The concept originates from the work of Theodor Kaluza and Oskar Klein in the 1920s and is a standard tool in string theory, supergravity, and related frameworks.
In a typical setup, spacetime is taken to be a product M^D = M^d × K, where d
The higher-dimensional metric decomposes into a d-dimensional metric, gauge fields from mixed components, and scalar fields
Limitations include moduli stabilization, control over the infinite KK tower, and the need to ensure a consistent
See also: Kaluza-Klein theory, extra dimensions, compactification, string theory, effective field theory.