Violation of sum rules by random-phase-approximation surface response calculations based on a density-functional ground-state description

1985 ◽  
Vol 32 (10) ◽  
pp. 6255-6260 ◽  
Author(s):  
Ansgar Liebsch
Keyword(s):  
Ground State ◽  
Random Phase Approximation ◽  
Density Functional ◽  
Sum Rules ◽  
Random Phase ◽  
Phase Approximation ◽  
Surface Response

VARIATIONAL RANDOM PHASE APPROXIMATION FOR THE ANHARMONIC OSCILLATOR

1991 ◽  
Vol 06 (26) ◽  
pp. 2429-2435 ◽  
Author(s):  
J. DUKELSKY ◽  
P. SCHUCK
Keyword(s):  
Wave Function ◽  
Density Matrix ◽  
Ground State ◽  
Random Phase Approximation ◽  
Anharmonic Oscillator ◽  
Random Phase ◽  
Oscillator Model ◽  
Phase Approximation ◽  
Truncation Scheme

The recently derived Variational Random Phase Approximation is examined using the anharmonoic oscillator model. Special attention is paid to the ground state RPA wave function and the convergence of the proposed truncation scheme to obtain the diagonal density matrix.

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