Lax-phillips Scattering and Conservative Linear Systems: A Cuntz-algebra Multidimensional Setting (Memoirs of the American Mathematical Society)

Ball, Joseph A.

ISBN 10: 0821837680 / ISBN 13: 9780821837689

Editore: Amer Mathematical Society, 2005

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Titolo: Lax-phillips Scattering and Conservative ...

Casa editrice: Amer Mathematical Society

Data di pubblicazione: 2005

Legatura: Brossura

Condizione: Like New

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Riassunto:

We present a multivariable setting for Lax-Phillips scattering and for conservative, discrete-time, linear systems. The evolution operator for the Lax-Phillips scattering system is an isometric representation of the Cuntz algebra, while the nonnegative time axis for the conservative, linear system is the free semigroup on $d$ letters. The correspondence between scattering and system theory and the roles of the scattering function for the scattering system and the transfer function for the linear system are highlighted.Another issue addressed in this title is the extension of a given representation of the Cuntz-Toeplitz algebra (i.e., a row isometry) to a representation of the Cuntz algebra (i.e., a row unitary); the solution to this problem relies on an extension of the Szego factorization theorem for positive Toeplitz operators to the Cuntz-Toeplitz algebra setting. As an application, we obtain a complete set of unitary invariants (the characteristic function together with a choice of 'Haplitz' extension of the characteristic function defect) for a row-contraction on a Hilbert space.