Pants Decompositions of Random Surfaces

Larry Guth, Hugo Parlier, Robert Young

Research output: Contribution to journalArticlepeer-review


Our goal is to show, in two different contexts, that "random" surfaces have large pants decompositions. First we show that there are hyperbolic surfaces of genus g for which any pants decomposition requires curves of total length at least g7/6-ε. Moreover, we prove that this bound holds for most metrics in the moduli space of hyperbolic metrics equipped with the Weil-Petersson volume form. We then consider surfaces obtained by randomly gluing euclidean triangles (with unit side length) together and show that these surfaces have the same property.

Original languageEnglish (US)
Pages (from-to)1069-1090
Number of pages22
JournalGeometric and Functional Analysis
Issue number5
StatePublished - Oct 2011


  • Bers' constants
  • Riemann surfaces
  • Teichmüller and moduli spaces
  • simple closed geodesics

ASJC Scopus subject areas

  • Analysis
  • Geometry and Topology


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