Isochrony in 3D radial potentials. From Michel H\'enon ideas to isochrone relativity: classification, interpretation and applications - Archive ouverte HAL Access content directly
Journal Articles Communications in Mathematical Physics Year : 2018

## Isochrony in 3D radial potentials. From Michel H\'enon ideas to isochrone relativity: classification, interpretation and applications

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Alicia Simon-Petit
Jérôme Perez
Guillaume T. Duval
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#### Abstract

Revisiting and extending an old idea of Michel H\'enon, we geometrically and algebraically characterize the whole set of isochrone potentials. Such potentials are fundamental in potential theory. They appear in spherically symmetrical systems formed by a large amount of charges (electrical or gravitational) of the same type considered in mean-field theory. Such potentials are defined by the fact that the radial period of a test charge in such potentials, provided that it exists, depends only on its energy and not on its angular momentum. Our characterization of the isochrone set is based on the action of a real affine subgroup on isochrone potentials related to parabolas in the $\mathbb{R}^2$ plane. Furthermore, any isochrone orbits are mapped onto associated Keplerian elliptic ones by a generalization of the Bohlin transformation. This mapping allows us to understand the isochrony property of a given potential as relative to the reference frame in which its parabola is represented. We detail this isochrone relativity in the special relativity formalism. We eventually exploit the completeness of our characterization and the relativity of isochrony to propose a deeper understanding of general symmetries such as Kepler's Third Law and Bertrand's theorem.

### Dates and versions

hal-01783415 , version 1 (02-05-2018)

### Identifiers

• HAL Id : hal-01783415 , version 1
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### Cite

Alicia Simon-Petit, Jérôme Perez, Guillaume T. Duval. Isochrony in 3D radial potentials. From Michel H\'enon ideas to isochrone relativity: classification, interpretation and applications. Communications in Mathematical Physics, 2018, 363 (2), p. 605-653. ⟨hal-01783415⟩

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