THE SCHUR-HORN THEOREM FOR OPERATORS AND FRAMES WITH PRESCRIBED NORMS AND FRAME OPERATOR.

By Jorge Antezana, Pedro G. Massey, Mariano A. Ruiz, Demetrio Stojanoff. 2005

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Let H be a Hilbert space. Given a bounded positive definite operator S on H, and a bounded sequence c = {ck}k2N of non negative real numbers, the pair (S, c) is frame admissible, if there exists a frame {fk}k2N on H with frame operator S, such that k fkk 2 = ck, k ∈ N. We relate the existence of such frames with the Schur-Horn theorem of majorization, and give a reformulation of the extended version of Schur-Horn theorem, due to A. Neumann. We use it to get necessary conditions (and to generalize known sufficient conditions) f or a pair (S, c), to be frame admissible.

Subfields: Applied Mathematics, Mathematical Physics

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