Type and Cotype of Operator Spaces

We consider two operator space versions of type and cotype, namely Sp-type, Sq-cotype and type (p, H), cotype (q, H) for a homogeneous Hilbertian operator space H and 1 ≤ p ≤ 2 ≤ q ≤ ∞, generalizing “OH-cotype 2” of G. Pisier. We compute type and cotype of some Hilbertian operator spaces and Lp spaces, and we investigate the relationship between a homogeneous Hilbertian space H and operator spaces with cotype (2, H). As applications we consider operator space versions of generalized little Grothendieck’s theorem and Maurey’s extension theorem in terms of these new notions.