arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1409.6983math.GT
收藏

伪Anosov伸缩因子与映射环面的同调

Pseudo-Anosov stretch factors and homology of mapping tori

Ian Agol, Christopher J. Leininger, Dan Margalit

摘要:

我们考虑亏格为g的曲面的映射类群的伪Anosov元,它固定曲面的第一同调的秩k子群.我们证明了其中最小的熵可与(k+1)/g相媲美。这插值之间的结果彭纳和法布和第二和第三作者,谁治疗的情况下,k=0和k=2g,分别回答了一个问题的艾伦伯格。我们还证明了上述伪Anosov映射类的共轭类的数目像k次多项式一样增长(作为g的函数)。

英文摘要:

We consider the pseudo-Anosov elements of the mapping class group of a surface of genus g that fix a rank k subgroup of the first homology of the surface. We show that the smallest entropy among these is comparable to (k+1)/g. This interpolates between results of Penner and of Farb and the second and third authors, who treated the cases of k=0 and k=2g, respectively, and answers a question of Ellenberg. We also show that the number of conjugacy classes of pseudo-Anosov mapping classes as above grows (as a function of g) like a polynomial of degree k.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑