Foundations of physics in Milan, Padua and Paris. Newtonian trajectories from celestial mechanics to atomic physics

Foundations of physics in Milan, Padua and Paris. Newtonian trajectories from celestial mechanics to atomic physics

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This paper is written, in a very informal and colloquial style, on the occasion of the seventieth birthday of Antonio Giorgilli.The aim jomeed furniture is to describe how his first scientific works were actually conceived within a group that happened to be formed in the years seventies with an ambitious program on the foundations of physics.Namely, to understand whether the recent (at those times) progress in dynamical systems theory might allow one to enlighten in some new way the relations between quantum mechanics and classical physics.

This required to understand what impact dynamical systems theory may have on the foundations of classical statistical mechanics (with particular attention to the Fermi-Pasta-Ulam problem), and on matter-radiation interaction.In such a frame Celestial Mechanics too started to be addressed, particularly by Antonio, initially just as a kind of a byproduct.Here a recollection is given of how the group was formed.

Then a quick review is given of the results obtained, the attention being mainly addressed to jordan 12 nubuck those relevant for the original foundational program.