 Freund–Rubin compactification

Freund–Rubin compactification is a form of dimensional reduction in which a field theory in "d"-dimensional spacetime, containing gravity and some field whose field strength formula_1 is a rank "s" antisymmetric tensor, 'prefers' to be reduced down to a spacetime with a dimension of either "s" or "d-s".Consider General Relativity in "d" spacetime dimensions.