On the J -Anti-invariant cohomology of almost complex 4-manifolds

Tedi Draghici, Tian Jun Li, Weiyi Zhang

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


For a compact almost complex 4-manifold (M, J ), we study the subgroups H±J of H2 (M,R)consisting of cohomology classes representable by J -invariant, respectively, J -anti-invariant real 2-forms. If b+ = 1, we show that, for generic almost complex structures on M, the subgroup HJ is trivial. Computations of the subgroups and their dimensions h±J are obtained foralmost complex structures related to integrable ones. We also prove semi-continuity propertiesfor h±J.

Original languageEnglish (US)
Pages (from-to)83-111
Number of pages29
JournalQuarterly Journal of Mathematics
Issue number1
StatePublished - Mar 2013

Bibliographical note

Funding Information:
During the preparation of this work, the authors benefited from partial support from NSF grant DMS-0604748 (of the second author).


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