Mathematics – Dynamical Systems
Scientific paper
2011-02-07
Mathematics
Dynamical Systems
M\'emoire d'habilitation, 53 pages, 5 figures
Scientific paper
We review the author's results on Mather's $\beta$ function : non-strict convexity of $\beta$ when the configuration space has dimension two, link between the size of the Aubry set and the differentiability of $\beta$, correlation between the rationality of the homology class and the differentiability of $\beta$, equality of the Mather set and the Aubry set for a large number of cohomology classes when the configuration space has dimension two, link beween the differentiability of $\beta$ and the integrability of the system. Ma\~{n}\'e's conjectures are discussed in Chapters 6 and 7. A short list of open problems is given at the end of each chapter. In Appendix A we prove a theorem which extends Theorem 5 of reference [Mt09]. In Appendix B we discuss a geometrical problem which arises from Chapter 3, but may be of independant interest.
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