Differential invariants of prehomogeneous vector spaces studies in
detail two differential invariants of a discriminant divisor of a
prehomogeneous vector space. The Bernstein-Sato polynomial and the
spectrum, which encode the monodromy and Hodge theoretic informations of
an associated Gauss-Manin system. The theoretical results are applied to
discriminants in the representation spaces of the Dynkin quivers An, Dn,
E6, E7 and three non classical series of quiver representations.