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Gonzalo Contreras

Publications and source records attributed to Gonzalo Contreras.

23 records · Page 2Linked to original sources
arXiv2013

Maximizing measures for expanding transformations

On a one-sided shift of finite type we prove that for a generic Holder continuous function there is a unique maximizing measure. We show that b-Holder continuous functions can be approximated in the a-Holder topology, a<b, by a function whose maximizing measure is supported on a periodic orbit. We also show that maximizing measures can be obtained as weak limits of equilibrium states. We apply these theorems to the class of C(1+a) endomorphisms of the circle which are coverings of degree 2, uniformly expanding and orientation preserving. We prove that generically the invariant probability which maximizes the Lyapunov exponent is unique and that C(1+b) endomorphisms can be approximated in the C(1+a) topology by endomorphisms whose Lyapunov maximizing measure is supported on a periodic orbit.

math.DS↗
arXiv2011

Piecewise Analytic Subactions for Analytic Dynamics

We consider a piecewise analytic expanding map f: [0,1]-> [0,1] of degree d which preserves orientation, and an analytic positive potential g: [0,1] -> R. We address the analysis of the following problem: for a given analytic potential beta log g, where beta is a real constant, it is well known that there exists a real analytic (with a complex analytic extension to a small complex neighborhood of [0,1]) eigenfunction phi_beta for the Ruelle operator. One can ask: what happen with the function phi_beta, when beta goes to infinity. The domain of analyticity can change with beta. The correct question should be: is 1/ beta log phi_beta analytic in the limit, when beta goes to infinity ? Under a uniqueness assumption, this limit, when beta goes to infinity, is in fact a calibrated subaction V (see bellow definition). We show here that under certain conditions and for a certain class of generic potentials this continuous function is piecewise analytic (but not analytic). In a few examples one can get that the subaction is analytic (we need at least to assume that the maximizing probability has support in a unique fixed point).

math.DS↗
arXiv2004

The Palais-Smale condition for contact type energy levels for convex lagrangian systems

We prove that for a uniformly convex Lagrangian system L on a compact manifold M, almost all energy levels contain a periodic orbit. We also prove that below Ma ne's critical value of the lift of the Lagrangian to the universal cover, almost all energy levels have conjugate points. We prove that if the energy level [E=k] is of contact type and M is not the 2-torus then the free time action functional of L+k satisfies the Palais-Smale condition.

math.DS↗