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Olivier Costa de BeauregardHomme de science et esprit libreG

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Olivier Costa de Beauregard Homme de science et esprit libre

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Fondation Louis de Broglie 23, rue Marsoulan, F-75012 PARIS

En cette année 2003, je connais Olivier Costa de Beauregard depuis près de cinquante ans, depuis mon entrée en 1954 dans le groupe de Louis de Broglie à l’Institut Henri Poincaré : l’I.H.P. comme disent les familiers, de même que je dirai simplement Olivier comme je l’appelle dans la vie, ou Costa comme nous le nommons entre nous.

Je connaissais déjà l’I.H.P. où j’avais fait une partie de mes études et où j’avais assisté au cours du lundi de Louis de Broglie, celui destiné aux étu- diants. Je n’eus donc qu’à monter deux étages pour accéder, très impression- né, à ce qui était pour moi un temple de la science. Un témoin m’a dit que mon pas s’en était alourdi, dans l’escalier. Très vexé, je me promis d’y veil- ler.

J’ai découvert Olivier au séminaire du mardi qui se réunissait à l’étage, et au cours du jeudi qui se tenait dans le même amphithéâtre Darboux que celui du lundi, mais s’adressait aux chercheurs, avec un programme qui changeait tous les ans comme au Collège de France. Ces deux événements hebdomadai- res réunissaient le “Tout-Paris” de la physique théorique car on y venait de tous les instituts, et ces réunions ont joué un rôle éminent dans la physique française pendant une trentaine d’années. Elles ont formé des générations de chercheurs, y compris ceux qui, cédant aux sirènes californiennes, se sont détournés de de Broglie et, dans un meurtre freudien du père, en ont dit pis que pendre, pour se vanter, beaucoup plus tard, en prenant de l’âge, d’avoir

“passé une thèse avec lui”, lorsqu’ils étaient interviewés par des journalistes.

On se représente difficilement, aujourd’hui, la solennité dont étaient entou- rées les entrées de Louis de Broglie.

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