6 papers
On Parametric Resonance in Quantum Many-Body System
Y. Tsue, J. da Providencia, A. Kuriyama +1
The dynamics governed by a requantized collective Hamiltonian in the coupled Lipkin model is investigated in the time-dependent variational approach with squeezed state. It is poin…
The Heisenberg antiferromagnet: an explicitly rotational invariant formulation
J. da Providencia, C. Providencia, M. Brajczewska
A simple derivation of an explicitly rotational invariant Lagrangian describing the dynamics of an antiferromagnetic spin system is presented. The scope of the derived Lagrangian i…
On A Possible Scheme of q-Deformation of Many-Boson Systems in Time-Dependent Variational Method
A. Kuriyama, C. Providencia, J. da Providencia +2
A possible scheme of q-deformation, which was recently developed by the present authors, is reviewed by stressing the starting idea.
The su(1,1)-Algebraic Boson Model in the Deformed Boson Scheme
A. Kuriyama, C. Providencia, J. da Providencia +2
Following the deformed boson scheme leading to the su(1,1)-algebra, a certain simple boson system is deformed in the framework of the second Holstein-Primakoff representation. With…
Deformed Boson Scheme including Conventional q-Deformation in Time-Dependent Variational Method. III
A. Kuriyama, C. Providencia, J. da Providencia +2
Basic idea presented in Parts (I) and (II) for the deformed boson scheme is applied to the case of the su(2,1)-algebra for describing many-body systems consisting of three kinds of…
A Possible Boson Realization of Generalized Lipkin Model for Many-Fermion System
A. Kuriyama, C. Providencia, J. da Providencia +2
On the basis of the formalism proposed by three of the present authors (A.K., J.P.and M.Y.), generalized Lipkin model consisting of (M+1) single-particle levels is investigated. Th…