Monday, April 22, 2013

1304.5277 (Luis O. Silva et al.)

On dB spaces with nondensely defined multiplication operator and the
existence of zero-free functions

Luis O. Silva, Julio H. Toloza
In this work we consider de Branges spaces where the multiplication operator by the independent variable is not densely defined. First, we study the canonical selfadjoint extensions of the multiplication operator as a family of rank-one perturbations. Then, on the basis of the obtained results, we provide new necessary and sufficient conditions for a real, zero-free function to lie in a de Branges space.
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