The Fourier–Mukai transform or Mukai–Fourier transform is a transformation used in algebraic geometry. It is somewhat analogous to the classical Fourier transform used in analysis.
Let be an abelian variety and be its dual variety. We denote by the Poincaré bundle on
normalized to be trivial on the fibers at zero. Let and be the canonical projections.
The Fourier-Mukai functor is then
The notation here: D means derived category of coherent sheaves, and R is the higher direct image functor, at the derived category level.
There is a similar functor
Let g denote the dimension of X.
The Fourier-Mukai transformation is nearly involutive :
It transforms Pontrjagin product in tensor product and conversely.