# An absolute grading on Heegaard Floer homology by homotopy classes of oriented 2-plane fields

@article{Ramos2011AnAG, title={An absolute grading on Heegaard Floer homology by homotopy classes of oriented 2-plane fields}, author={Vinicius G. B. Ramos and Yang Huang}, journal={arXiv: Symplectic Geometry}, year={2011} }

For a closed oriented 3-manifold Y, we define an absolute grading on the Heegaard Floer homology groups of Y by homotopy classes of oriented 2-plane fields. We show that this absolute grading refines the relative one and that it is compatible with the maps induced by cobordisms. We also prove that if {\xi} is a contact structure on Y, then the grading of the contact invariant c({\xi}) is the homotopy class of {\xi}.

## 23 Citations

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