Homoclinic points, atoral polynomials, and periodic points of algebraic Z^d-actions

Details Homoclinic points, atoral polynomials, and periodic points of algebraic Z^d-actions Homoclinic points, atoral polynomials, and periodic points of algebraic Z^d-actions

2011-08-25

arxiv.org/abs/1108.4989v2

Mathematics

Dynamical Systems

23 pages, corrected an error in the calculation of periodic components, but this does not affect the results. Accepted for pub

Scientific paper

Cyclic algebraic Z^d-actions are defined by ideals of Laurent polynomials in d commuting variables. Such an action is expansive precisely when the complex variety of the ideal is disjoint from the multiplicative d-torus. For such expansive actions it is known that the limit for the growth rate of periodic points exists and is equal to the entropy of the action. In an earlier paper the authors extended this result to ideals whose variety intersects the d-torus in a finite set. Here we further extend it to the case when the dimension of intersection of the variety with the d-torus is at most d-2. The main tool is the construction of homoclinic points which decay rapidly enough to be summable.

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