## Abstract

In the theory of cluster algebras, a mutation loop induces discrete dynamical systems via its actions on the cluster A- and X-varieties. In this paper, we introduce a property of mutation loops, called the sign stability, with a focus on the asymptotic behavior of the iteration of the tropical X-transformation. The sign stability can be thought of as a cluster algebraic analogue of the pseudo-Anosov property of a mapping class on a surface. A sign-stable mutation loop has a numerical invariant which we call the cluster stretch factor, in analogy with the stretch factor of a pseudo-Anosov mapping class on a marked surface. We compute the algebraic entropies of the cluster A- and X-transformations induced by a sign-stable mutation loop, and conclude that these two coincide with the logarithm of the cluster stretch factor. This gives a cluster algebraic analogue of the classical theorem which relates the topological entropy of a pseudo-Anosov mapping class with its stretch factor.

Original language | English |
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Pages (from-to) | 79-118 |

Number of pages | 40 |

Journal | Geometriae Dedicata |

Volume | 214 |

Issue number | 1 |

DOIs | |

Publication status | Published - 2021 Oct |

Externally published | Yes |

## Keywords

- Algebraic entropy
- Cluster algebra
- Mutation loop
- Pseudo-Anosov mapping class

## ASJC Scopus subject areas

- Geometry and Topology