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}. 
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