The linear response to a space- and time-dependent external disturbance of a system of dilute condensed composite bosons at zero temperature, as obtained from the linearized version of the time-dependent Gross- Pitaevskii equation, is shown to result also from the strong-coupling limit of the time-dependent BCS ~or broken-symmetry random-phase! approximation for the constituent fermions subject to the same external disturbance. In this way, it is possible to connect excited-state properties of the bosonic and fermionic systems by placing the Gross-Pitaevskii equation in perspective with the corresponding fermionic approximations.
STRINATI CALVANESE, G., PIERI, P. (2004). Time-dependent Gross-Pitaevskii equation for composite bosons as the strong coupling limit of the fermionic broken-symmetry random-phase approximation. PHYSICAL REVIEW A, 69(1), 011601-1-011601-4 [10.1103/PhysRevA.69.011601].
Time-dependent Gross-Pitaevskii equation for composite bosons as the strong coupling limit of the fermionic broken-symmetry random-phase approximation
PIERI, Pierbiagio
2004
Abstract
The linear response to a space- and time-dependent external disturbance of a system of dilute condensed composite bosons at zero temperature, as obtained from the linearized version of the time-dependent Gross- Pitaevskii equation, is shown to result also from the strong-coupling limit of the time-dependent BCS ~or broken-symmetry random-phase! approximation for the constituent fermions subject to the same external disturbance. In this way, it is possible to connect excited-state properties of the bosonic and fermionic systems by placing the Gross-Pitaevskii equation in perspective with the corresponding fermionic approximations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
