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Article Dans Une Revue Journal of the European Mathematical Society Année : 2018

The calculus of thermodynamical formalism

Résumé

Given a finite-to-one map acting on a compact metric space, one classically constructs for each potential in an appropriate Banach space of functions a transfer operator acting on functions. Under suitable condition, the Ruelle-Perron-Frobenius enable to define for each potential an invariant measure called the Gibbs measure. The set of potential giving birth to the same Gibbs measure is a linear subspace containing one distinguished potential, said to be normalized. The goal of the present article is to study the geometry of the set of normalized potentials, of the normalization map, and of the Gibbs map sending potentials to Gibbs measures. We give an easy proof of the fact that the set of normalized potentials is an analytic submanifold and that the normalization map is analytic; we compute the derivative of the Gibbs map; last we endow the set of normalized potential with a natural weak Riemannian metric (derived from the asymptotic variance) with respect to which we compute the gradient flow induced by the pressure with respect to a given potential, e.g. the metric entropy functional. We also apply these ideas to recover in a wide setting existence and uniqueness of equilibrium states, possibly under constraints.
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Dates et versions

hal-01183036 , version 1 (05-08-2015)

Identifiants

Citer

Paolo Giulietti, Benoit R. Kloeckner, Artur O. Lopes, Diego Marcon. The calculus of thermodynamical formalism. Journal of the European Mathematical Society, 2018, 20 (10), pp.2357-2412. ⟨10.4171/JEMS/814⟩. ⟨hal-01183036⟩
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