Miles, R. and Ward, T. (2009) 'Orbit-counting for nilpotent group shifts.', *Proceedings of the American Mathematical Society.*, 137 (04). pp. 1499-1507.

## Abstract

We study the asymptotic behaviour of the orbit-counting function and a dynamical Mertens' theorem for the full $G$-shift for a finitely-generated torsion-free nilpotent group $G$. Using bounds for the M{\"o}bius function on the lattice of subgroups of finite index and known subgroup growth estimates, we find a single asymptotic of the shape \[ \sum_{|\tau|\le N}\frac{1}{e^{h|\tau|}}\sim CN^{\alpha} (\log N)^{\beta} \] where $|\tau|$ is the cardinality of the finite orbit $\tau$. For the usual orbit-counting function we find upper and lower bounds together with numerical evidence to suggest that for actions of non-cyclic groups there is no single asymptotic in terms of elementary functions.

Item Type: | Article |
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Full text: | PDF - Accepted Version (146Kb) |

Status: | Peer-reviewed |

Publisher Web site: | http://dx.doi.org/10.1090/S0002-9939-08-09649-4 |

Publisher statement: | First published in Transactions of the American Mathematical Society in 2009, volume 137 published by the American Mathematical Society. © Copyright 2009 American Mathematical Society. |

Record Created: | 12 Oct 2012 10:05 |

Last Modified: | 14 Dec 2012 13:59 |

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