We realize the logarithm of the third smallest known Salem number as the topological entropy of a K3 surface automorphism with a Siegel disk and a pointwise fixed curve at the same time. We also show that the logarithm of the Lehmer number, the smallest known Salem number, is not realizable as the topological entropy of any Enriques surface automorphism. These results are entirely inspired by McMullen's works and Mathematica programs.
机构:
Univ Tokyo, Math Sci, Meguro Komaba 3-8-1, Tokyo, Japan
Korea Inst Adv Study, Hoegiro 87, Seoul 133722, South KoreaFree Univ Berlin, Arnimallee 3, D-14195 Berlin, Germany