On the integrability of Tonelli Hamiltonians

Sorrentino, Alfonso

doi:10.1090/S0002-9947-2011-05492-9

On the integrability of Tonelli Hamiltonians
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by Alfonso Sorrentino PDF

Trans. Amer. Math. Soc. 363 (2011), 5071-5089 Request permission

Abstract:

In this article we discuss a weaker version of Liouville’s Theorem on the integrability of Hamiltonian systems. We show that in the case of Tonelli Hamiltonians the involution hypothesis on the integrals of motion can be completely dropped and still interesting information on the dynamics of the system can be deduced. Moreover, we prove that on the $n$-dimensional torus this weaker condition implies classical integrability in the sense of Liouville. The main idea of the proof consists in relating the existence of independent integrals of motion of a Tonelli Hamiltonian to the “size” of its Mather and Aubry sets. As a byproduct we point out the existence of “non-trivial” common invariant sets for all Hamiltonians that Poisson-commute with a Tonelli Hamiltonian.

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