Homology torsion growth and Mahler measure. (English) Zbl 1302.57005
B. Kitchens and K. Schmidt [Ergodic Theory Dyn. Syst. 9, No. 4, 691–735 (1989; Zbl 0709.54023)] associated to any (countable) module \(M\) over the ring \(R=\mathbb{Z}[t_1^{\pm1},\dots,t_d^{\pm1}]\) an action of \(\mathbb{Z}^d\) by automorphisms of the compact (metrizable) abelian dual group of \(M\), initiating a series of results relating the algebraic and geometric properties of the module \(M\) to dynamical properties of the associated \(\mathbb{Z}^d\)-action. D. Lind et al. [Invent. Math. 101, No. 3, 593–629 (1990; Zbl 0774.22002)] showed that if \(M\) is finitely generated then the joint topological entropy of the action associated to \(M\) is given by the logarithmic Mahler measure of \(\Delta_0(M)\), the \(0\)th Alexander polynomial of \(M\), and (under the additional hypothesis that the action is expansive) showed that the entropy is given by the growth rate of periodic points along large parallelepipeds. A fundamental feature of many algebraic \(\mathbb{Z}^d\)-actions is however that without expansiveness the set of points fixed by a lattice \(L<\mathbb{Z}^d\) will often be infinite, and Schmidt formulated a conjectural relationship between the entropy of the system associated to the torsion part of the module and the growth rate of the number of connected components of the group of \(L\)-periodic points as \(L\) goes to infinity in a suitable sense. This conjectural relationship is established here, and a related result of D. S. Silver and S. G. Williams [Topology 41, No. 5, 979–991 (2002; Zbl 1024.57007)] on the growth of homology torsion of finite abelian coverings of link complements is generalized.
Reviewer: Thomas B. Ward (Durham)
MSC:
57M10 | Covering spaces and low-dimensional topology |
57M25 | Knots and links in the \(3\)-sphere (MSC2010) |
57Q10 | Simple homotopy type, Whitehead torsion, Reidemeister-Franz torsion, etc. |
37B50 | Multi-dimensional shifts of finite type, tiling dynamics (MSC2010) |
37B10 | Symbolic dynamics |