Generalized numerical radius and relatec inequalities

Abstract

In [2], Abu Omar and Kittaneh defined a new generalization of the numerical radius. That is, given a norm N (·) on B(H), the space of bounded linear operators over a Hilbert space H, and A ∈ B(H) w N (A) = sup N (Re(e iθ A)). θ∈R They proved several properties and introduced some inequalities. We continue with the study of this generalized numerical radius and we develop diverse inequalities involving w N . We also study particular cases when N (·) is the p- Schatten norm with p > 1.