Integrability of potentials of degree $k \neq \pm 2$. Second  order variational equations between Kolchin solvability and  Abelianity

Guillaume Duval; Andrzej J. Maciejewski

doi:10.3934/dcds.2015.35.1969

Article Contents

2015, Volume 35, Issue 5: 1969-2009. Doi: 10.3934/dcds.2015.35.1969

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Integrability of potentials of degree $k \neq \pm 2$. Second order variational equations between Kolchin solvability and Abelianity

Guillaume Duval^1, and
Andrzej J. Maciejewski^2,

1.
Laboratoire de Mathématiques et d'Informatique (LMI), INSA de Rouen, Avenue de l'Université, 76 801 Saint Etienne du Rouvray Cedex
2.
Institute of Astronomy, University of Zielona Góra, Licealna 9, PL-65-417, Zielona Góra

Received: December 31, 2012

Revised: August 31, 2014

Published: May 2017

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Abstract

In our previous paper [4], we tried to extract some particular structures of the higher variational equations (the $\mathrm{VE}_p$ for $p \geq 2$), along particular solutions of natural Hamiltonian systems with homogeneous potential of degree $k=\pm 2$. We investigate these variational equations in a framework of differential Galois theory. Our aim was to obtain new obstructions for complete integrability. In this paper we extend results of [4] to the complementary cases, when the homogeneous potential has integer degree of homogeneity $k\in\mathbb{Z}$, and $|k| \geq 3$. Since these cases are much more general and complicated, we restrict our study only to the second order variational equation $\mathrm{VE}_2$.

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Mathematics Subject Classification: Primary: 37J30, 70H07, 37J35, 34M35.

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References

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