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We define an embedding of the space of complex momenta and masses inperturbation theory into a universal projective space. This embedding isnatural in the sense of properties of the vector bundle defined by Feynmanintegrals on the complement to Landau varieties. We point out that there is aholonomic D-module associated with individual Feynman integrals. We quoteexplicit generators for this D-module on the fully deformed space of particlemomenta. This basis is quadratic in the derivatives. We conclude that there isholonomic D-module on the physical space of momenta.

Universal deformation of particle momenta space in perturbation theory