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Convergence of gradient-based algorithms for the Hartree-Fockequations

Published online by Cambridge University Press:  30 March 2012

Antoine Levitt*
Affiliation:
Université Paris-Dauphine, CEREMADE, Place du Maréchal Lattre de Tassigny, 75775 Paris Cedex 16, France. e-mail: [email protected]
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Abstract

The numerical solution of the Hartree-Fock equations is a central problem in quantumchemistry for which numerous algorithms exist. Attempts to justify these algorithmsmathematically have been made, notably in [E. Cancès and C. Le Bris, Math. Mod.Numer. Anal. 34 (2000) 749–774], but, to our knowledge, nocomplete convergence proof has been published, except for the large-Zresult of [M. Griesemer and F. Hantsch, Arch. Rational Mech. Anal. (2011)170]. In this paper, we prove the convergence of a natural gradient algorithm, using agradient inequality for analytic functionals due to Łojasiewicz [Ensemblessemi-analytiques. Institut des Hautes Études Scientifiques (1965)]. Then,expanding upon the analysis of [E. Cancès and C. Le Bris, Math. Mod. Numer. Anal.34 (2000) 749–774], we prove convergence results for the Roothaanand Level-Shifting algorithms. In each case, our method of proof provides estimates on theconvergence rate. We compare these with numerical results for the algorithms studied.

Type
Research Article
Copyright
© EDP Sciences, SMAI, 2012

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