Positive factorizations of mapping classes

Baykur, R İnanç¹ ; Monden, Naoyuki² ; Van Horn-Morris, Jeremy³

¹Department of Mathematics and Statistics, University of Massachusetts, Lederle Graduate Research Tower, 710 North Pleasant Street, Amherst, MA 01003-9305, United States
²Department of Engineering Science, Osaka Electro-Communication University, Hatsu-cho 18-8, Neyagawa 572-8530, Japan
³Department of Mathematical Sciences, The University of Arkansas, Fayetteville, AR 72701, United States

Algebraic and Geometric Topology, Tome 17 (2017) no. 3, pp. 1527-1555

Résumé

In this article, we study the maximal length of positive Dehn twist factorizations of surface mapping classes. In connection to fundamental questions regarding the uniform topology of symplectic 4–manifolds and Stein fillings of contact 3–manifolds coming from the topology of supporting Lefschetz pencils and open books, we completely determine which boundary multitwists admit arbitrarily long positive Dehn twist factorizations along nonseparating curves, and which mapping class groups contain elements admitting such factorizations. Moreover, for every pair of positive integers g and n, we tell whether or not there exist genus-g Lefschetz pencils with n base points, and if there are, what the maximal Euler characteristic is whenever it is bounded above. We observe that only symplectic 4–manifolds of general type can attain arbitrarily large topology regardless of the genus and the number of base points of Lefschetz pencils on them.

Détail

DOI : 10.2140/agt.2017.17.1527

Classification : 20F65, 53D35, 57R17
Keywords: mapping class groups, Lefschetz fibrations, contact manifolds, symplectic manifolds

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