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Closed orbits in homology classes. (English) Zbl 0728.58026
The authors consider a smooth, transitive and weakly mixing Anosov flow on a compact manifold. By introducing an analogue of the density theorem for prime numbers, they succeed to estimate the number of closed orbits in a homology class.
Given a surjective homomorphism $$\psi$$ of $$H_ 1(X,Z)$$ onto an abelian group H, for each $$\alpha\in H$$ and for each positive number x, the authors set $\Pi(x,\alpha)= \{{\mathfrak p};\text{ closed orbits with } \psi[{\mathfrak p}]=\alpha \text{ and }\ell({\mathfrak p})<x\},$ and $\pi(x,\alpha) = \text{ the cardinality of }\Pi(x,\alpha)$ where [$${\mathfrak p}]$$ denotes the homology class and $$\ell ({\mathfrak p})$$ the least period of $${\mathfrak p}.$$
One of the main results in the present paper is concerned with an asymptotic estimate of $$\pi$$ (x,$$\alpha$$) as x goes to infinity. The authors have remarked the resemblance of this problem to a number theoretic problem, and demonstrate that an analogue of the density theorem for prime numbers holds. However, the main problem is that the “Galois group” H is possibly of infinite order, such that interesting extra phenomena appear.
Reviewer: D.Savin (Montreal)

##### MSC:
 37D99 Dynamical systems with hyperbolic behavior 37A99 Ergodic theory
##### Keywords:
Anosov flows; closed orbits in homology classes
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