Generalized Bogoliubov transformations versus $\mathcal{D}$% -pseudo-bosons

Abstract

We demonstrate that not all generalized Bogoliubov transformations lead to $\mathcal{D}$-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 self-adjoint 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 $\mathcal{D}$-quasi bases.

in press in Journal of Mathematical Physics

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Cited by in corpus (4)

• A no-go result for the quantum damped harmonic oscillator
• From Pseudo-bosons to Pseudo-Hermiticity via multiple generalized Bogoliubov transformations
• Spectrum and normal modes of non-hermitian quadratic boson operators
• On the presence of families of pseudo-bosons in nilpotent Lie algebras of arbitrary corank