Self-energy operator and self-energy fields in many-body systems: Liouvillian approach

An explicit definition for the self-energy field operator and the self-energy fields obtained from an average of the associated operator within the algebraic formalism of superoperators is presented. It stems from the formal expansion of the many-body propagator equations of motion hierachy in quant...

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Autor principal: Bochicchio, Roberto Carlos
Otros Autores: Grinberg, H.
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 2002
Acceso en línea:Registro en Scopus
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Registro en la Biblioteca Digital
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100 1 |a Bochicchio, Roberto Carlos 
245 1 0 |a Self-energy operator and self-energy fields in many-body systems: Liouvillian approach 
260 |c 2002 
270 1 0 |m Bochicchio, R.C.; Departamento de Física, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina; email: rboc@df.uba.ar 
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504 |a Bochicchio, R.C., Alcoba, D.R., unpublished results; Valdemoro, C., De Lara, M.P., Bochicchio, R.C., Pèrez-Romero, E., (1997) Int J Quantum Chem, 65, p. 97 
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504 |a Bochicchio, R.C., (1990) An Asoc Fís Arg, 2, p. 51. , in Spanish 
504 |a Bochicchio, R.C., (1990) J Mol Struct (Theochem), 210, p. 99 
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504 |a Bochicchio, R.C., Ferraro, M.B., Grinberg, H., Cavasotto, C., (1995) J Mol Struct (Theochem), 335, p. 1 
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506 |2 openaire  |e Política editorial 
520 3 |a An explicit definition for the self-energy field operator and the self-energy fields obtained from an average of the associated operator within the algebraic formalism of superoperators is presented. It stems from the formal expansion of the many-body propagator equations of motion hierachy in quantum many-body systems within the scenario of the Liouvillian decoupling scheme developed in previous works. An essential theoretical property of such fields for the complete expansion of the propagator to any order in the interaction potential is shown. This states that the interaction potential to a given order only depends on one q-reduced density matrix. The contraction order q of the density matrix depends on both the nature of the operators defining the propagator and the actual order of the expansion. This result is rigorous regarding infinite summation of the irreducible terms of the self-energy fields and provides a direct way to estimate the extent to which many-body effects are involved in successive approximations, i.e., truncation of the excitation level given by the reference state throughout the reduced density matrix and the expansion of the propagator. © 2002 Wiley Periodicals, Inc. Int. J. Quantum Chem.  |l eng 
593 |a Departamento de Física, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, (1428) Buenos Aires, Argentina 
690 1 0 |a DYSON EQUATION 
690 1 0 |a LIOUVILLIAN APPROACH 
690 1 0 |a PROPAGATORS 
690 1 0 |a REDUCED DENSITY MATRICES 
690 1 0 |a SELF-ENERGY FIELDS 
690 1 0 |a ELECTRON ENERGY LEVELS 
690 1 0 |a EQUATIONS OF MOTION 
690 1 0 |a GREEN'S FUNCTION 
690 1 0 |a MATHEMATICAL OPERATORS 
690 1 0 |a MATRIX ALGEBRA 
690 1 0 |a REDUCED DENSITY MATRICES (RDM) 
690 1 0 |a QUANTUM THEORY 
700 1 |a Grinberg, H. 
773 0 |d 2002  |g v. 90  |h pp. 148-154  |k n. 1  |p Int J Quantum Chem  |x 00207608  |w (AR-BaUEN)CENRE-16  |t International Journal of Quantum Chemistry 
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