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6 papers
Generalization of the Hartree-Fock-Bogoliubov theory: one and two quasiparticle excitations
Paolo Tommasini, E. J. V. de Passos, M. O. C. Pires +1
We present a generalization of the Hartree-Fock Bogoliubov (HFB) theory in which the coupling between one and two quasi-particles is taken into account.This is done by writing the…
Collective Excitation of a Hybrid Atomic/Molecular Bose Einstein Condensate
Chi-Yong Lin, M. S. Hussein, A. F. R. de Toledo Piza +1
The collective excitation of hybrid atomic-molecular condensate are studied using variational method. The dipole response of the system is studied in detail. We found that the out-…
Giant Resonances in Coulomb Excitations of Relativistic Ions
M. S. Hussein, A. F. R. de Toledo Piza, O. K. Vorov
We propose a soluble model to incorporate the nonlinear effects in the transition probabilities of the multiphonon Giant Dipole Resonances based on the SU(1,1) algebra. Analytical…
Initial-Value Problem for Inhomogeneous Condensate: Gaussian Approximation and Beyond
Chi-Yong Lin, A. F. R. de Toledo Piza
Using many-body theory we develop a set of formally exact kinetic equations for inhomogeneous condensate and one-body observables. The method is illutrated for phi^4 field theory i…
Elementary Excitations of a Relativistic Scalar Plasma System
E. R. Takano Natti, Chi-Yong Lin, A. F. R. de Toledo Piza +1
We investigate the physics of elementary excitations for the so called relativistic scalar plasma system. Following the standard many-body procedure we have obtained the RPA equati…
Non-collapsing quasiparticle random phase approximation for nuclear double-beta decay
F. Krmpotic, A. Mariano, T. T. S. Kuo +2
We show how the longstanding problem of the collapse of the charge-exchange QRPA near the physical value of the force strength can be circumvented. This is done by including the ef…