#### Volume 18, issue 3 (2018)

 Recent Issues
 The Journal About the Journal Subscriptions Editorial Board Editorial Interests Editorial Procedure Submission Guidelines Submission Page Ethics Statement Author Index To Appear ISSN (electronic): 1472-2739 ISSN (print): 1472-2747 Other MSP Journals
Comparing $4$–manifolds in the pants complex via trisections

### Gabriel Islambouli

Algebraic & Geometric Topology 18 (2018) 1799–1822
##### Abstract

Given two smooth, oriented, closed $4$–manifolds, ${M}_{1}$ and ${M}_{2}$, we construct two invariants, ${D}^{P}\left({M}_{1},{M}_{2}\right)$ and $D\left({M}_{1},{M}_{2}\right)$, coming from distances in the pants complex and the dual curve complex, respectively. To do this, we adapt work of Johnson on Heegaard splittings of $3$–manifolds to the trisections of $4$–manifolds introduced by Gay and Kirby. Our main results are that the invariants are independent of the choices made throughout the process, as well as interpretations of “nearby” manifolds. This naturally leads to various graphs of $4$–manifolds coming from unbalanced trisections, and we briefly explore their properties.

##### Keywords
trisection, pants complex, dual curve complex, $4$–manifold
##### Mathematical Subject Classification 2010
Primary: 57M15, 57M99