Summary
A rigorous iteration method for the solution of nonlinear equations in Banach spaces, due to Isaac Newton and Kantorovič, is reported. We consider its application to three nonlinear problems of atomic and nuclear physics, in finite-dimensional spaces: the ordinary, the constrained and a generalized Hartree-Fock problem. We have proved the existence of a solution of the Hartree-Fock equations and its uniqueness in a definite small region of the functional space, for the nucleus16O. This method converges faster than the usual Hartree algorithm and displays some further advantages.
Riassunto
Si descrive un rigoroso metodo iterativo per la soluzione di equazioni non lineari in spazi di Banach, dovuto ad Isaac Newton ed a Kantorovič. Ne consideriamo l’applicazione a tre problemi non lineari di fisica atomica e nucleare, in spazi a dimensione finita: il problema di Hartree-Fock ordinario, quello con vincoli ed un problema generalizzato. Per il nucleo16O abbiamo dimostrato l’esistenza di una soluzione delle equazioni di Hartree-Fock e la sua unicità in una ben definita, piccola regione dello spazio funzionale. Questo metodo converge più velocemente dell’usuale algoritmo di Hartree e presenta alcuni ulteriori vantaggi.
Реэюме
Предлагается строгий итерационный метод для рещения нелинейных уравнений в пространствах Банаха, раэработанный Исааком Ньютоном и Канторовичем. Мы рассматриваем применение зтого метода к трем нелинейным проблемам атомной и ядерной фиэики в конечно-мерных пространствах: обыкновенной, ограниченной и обобшенной проблеме Хартри-Фока. Мы докаэали сушествование рещения уравнений Хартри-Фока и его единственность в определенной малой области функционального пространства, для ядра16O. Этот метод сходится быстрее, чем обычный алгоритм Хартри и обнаруживает некоторые дополнительные преимушества.
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References
F. Villars:Proc. S.I.F., Course XXIII, edited byV. Weisskopf (New York, 1963), p. 1;Proc. S.I.F., Course XXXVI, edited byC. Bloch (New York, 1966), p. 1;M. Baranger:Cargèse Lectures, 1962, edited byM. Lévy (New York, 1963).
H. A. Bethe, B. H. Brandow andA. G. Petschek:Phys. Rev.,129, 225 (1963);M. Baranger:Proc. S.I.F., Course XL, edited byM. Jean (New York, 1969), p. 511.
M. Baranger:Cargèse Lectures, 1962, edited byM. Lévy (New York, 1963);P. U. Sauer, A. Faessler, H. H. Wolter andM. M. Stingl:Nucl. Phys.,125 A, 257 (1969).
A. Agodi, M. Baldo andF. Catara:Nucl. Phys.,171 A, 199 (1971);C. F. Clement:Phys. Lett.,28 B, 395, 398 (1969).
L. D. Faddeev:Usp. Mat. Nauk,14, 57 (1959); English translation:Jour. Math. Phys.,4, 72 (1963).
R. Giordano, D. Gutkowski, A. Scalia andG. Schiffrer:Boll. S.I.F., No. 8732 (1971).
L. V. Kantorovich andG. P. Akilov:Functional Analysis in Normed Spaces, Chap. 17 and 18 (Oxford, 1964).
L. B. Rall:Computational Solution of Nonlinear Operator Equations, Chap. 3 and 4 (New York, 1969).
F″(X) is the Fréchet derivative ofF′(X). It is a bounded bilinear operator, mappingB×B intoB′. For the definition of norm, see (7).
K. T. R. Davies, S. J. Krieger andM. Baranger:Nucl. Phys.,84, 545 (1966);R. Muthukrishnan andM. Baranger:Phys. Lett.,18, 160 (1965);A. K. Kerman, J. P. Svenne andF. Villars:Phys. Rev.,147, 710 (1966);R. M. Tarbutton andK. T. R. Davies:Nucl. Phys.,120 A, 1 (1968).
M. R. Gunye:Nucl. Phys.,118 A, 174 (1968).
F. Villars:Proc. S.I.F., Course XXIII, edited byV. Weisskopf (New York, 1963), p. 1;Proc. S.I.F., Course XXXVI, edited byC. Bloch (New York, 1966), p. 1.
W. H. Bassichis, A. K. Kerman andJ. P. Svenne:Phys. Rev.,160, 746 (1967).
W. H. Bassichis andL. Wilets:Phys. Rev. Lett.,27, 1451 (1971).
C. A. Levinson:Herceg Novi Lectures, 1967, edited byM. V. Mihailović, M. Rosina andJ. Strnad (Beograd, 1967).
G. Ripka:Advances in Nuclear Physics, Vol.1, edited byM. Baranger andE. Vogt (New York, 1968).
E. Rhhimäki: unpublished Ph. D. Thesis, M.I.T. (1970).
K. T. R. Davies, S. J. Krieger andM. Baranger:Nucl. Phys.,84, 545 (1966).
S. Boffi andF. Pacati: private communication.
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This work has been supported in part by Istituto Nazionale di Fisica Nucleare, Sezione di Catania, and by Centro Siciliano di Fisica Nucleare e Struttura della Materia, Catania.
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Catara, F., Di Toro, M., Pace, E. et al. A rigorous method for solving nonlinear equations: Hartree-Fock and related problems. Nuov Cim A 11, 733–748 (1972). https://doi.org/10.1007/BF02729476
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DOI: https://doi.org/10.1007/BF02729476