On properties of normal operators and self-adjoint operators on smooth Banach spaces

Abstract

This article introduces classes of normal and unitary operators on smooth Banach spaces, providing extensions of the classical notions of normal and unitary operators from Hilbert spaces to the smooth Banach space setting. The proposed class of normal operators contains, in particular, the class of self-adjoint operators on Banach spaces known in the literature. In addition, we study several properties of self-adjoint operators on smooth Banach spaces, with emphasis on the norm, minimum modulus, numerical radius, and Crawford number, as well as the corresponding attainment properties and the relations among these quantities. Further, we obtain characterisations and spectral properties of the newly introduced classes of normal and unitary operators. Our results demonstrate close analogies with the corresponding theory of self-adjoint, normal, and unitary operators on Hilbert spaces.