Equivariant spaces of matrices of constant rank

We use representation theory to construct spaces of matrices of constant rank.These spaces are parametrized by the natural representation of the general linear group or the symplectic group.We present variants of this idea, with more complicated representations, and others with the orthogonal group.Our spaces of matrices correspond to vector bundles which are homogeneous.Some of the spaces admit deformations to non-homogeneous vector bundles, illustrating that these spaces of matrices sometimes admit large families of deformations.