Immersed Lagrangian Floer cohomology via pearly trajectories

Garrett Alston, Erkao Bao

Research output: Contribution to journalArticlepeer-review


We define Lagrangian Floer cohomology over Z2-coefficients by counting pearly trajectories for graded, exact Lagrangian immersions that satisfy a certain positivity condition on the index of the non-embedded points, and show that it is an invariant of the Lagrangian immersion under Hamiltonian deformations. We also show that it is naturally isomorphic to the Hamiltonian perturbed version of Lagrangian Floer cohomology as defined in [4]. As an application, we prove that the number of non-embedded points of such a Lagrangian in Cn is no less than the sum of its Betti numbers.

Original languageEnglish (US)
Article number104335
JournalJournal of Geometry and Physics
StatePublished - Nov 2021

Bibliographical note

Publisher Copyright:
© 2021 Elsevier B.V.


  • Floer cohomology
  • Immersed Lagrangian
  • Pearly trajectory
  • Positivity


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