6533b836fe1ef96bd12a0994

RESEARCH PRODUCT

Generalized Bogoliubov transformations versus D-pseudo-bosons

Andreas FringFabio Bagarello

subject

Pure mathematicsHilbert spaceStatistical and Nonlinear PhysicsBase (topology)Mathematical Operatorssymbols.namesakeTransformation (function)symbolsQASettore MAT/07 - Fisica MatematicaMathematical PhysicsEigenvalues and eigenvectorsQCStatistical and Nonlinear PhysicBosonMathematics

description

We demonstrate that not all generalized Bogoliubov transformations lead to D -pseudo-bosons and prove that a correspondence between the two can only be achieved with the imposition of specific constraints on the parameters defining the transformation. For certain values of the parameters, we find that the norms of the vectors in sets of eigenvectors of two related apparently non-selfadjoint number-like operators possess different types of asymptotic behavior. We use this result to deduce further that they constitute bases for a Hilbert space, albeit neither of them can form a Riesz base. When the constraints are relaxed, they cease to be Hilbert space bases but remain D -quasibases.

yearjournalcountryeditionlanguage
2015-10-20
10.1063/1.4933242https://openaccess.city.ac.uk/id/eprint/12702/1/1510.00963v1.pdf