Genus 2 lefschetz fibrations with b+2 = 1 and c21 = 1, 2

Anar Akhmedov, Naoyuki Monden

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In this article, we construct a family of genus 2 Lefschetz fibrations fn: Xθn → S2 with e(Xθn) = 11, b+2 (Xθn) = 1, and c21(Xθn) = 1 by applying a single lantern substitution to the twisted fiber sums of Matsumoto's genus 2 Lefschetz fibration over S2. Moreover, we compute the fundamental group of Xθn and show that it is isomorphic to the trivial group if n = −3 or −1, Z if n = −2, and Z|n+2| for all integers n = −3,−2,−1. Also, we prove that our fibrations admit −2 section, that their total spaces are symplectically minimal, and that they have symplectic Kodaira dimension κ = 2. In addition, using techniques developed over the past decade with other authors, we also construct the genus 2 Lefschetz fibrations over S2 with c21 = 1,2 and χ = 1 via the fiber sums of Matsumoto's and Xiao's genus 2 Lefschetz fibrations, and present some applications in constructing exotic smooth structures on small 4-manifolds with b+2 = 1 and b+2 = 3.

Original languageEnglish (US)
Pages (from-to)1419-1451
Number of pages33
JournalKyoto Journal of Mathematics
Issue number4
StatePublished - Dec 2020

Bibliographical note

Funding Information:
Akhmedov’s work was partially supported by National Science Foundation grant DMS-1005741, a Sloan Research Fellowship, and a Guillermo E. Borja award from the University of Minnesota. Monden’s work was partially supported by Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for Young Scientists (B) 13276356.

Publisher Copyright:
© 2020 by Kyoto University


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