Symplectic Parabolicity and L^2 Symplectic Harmonic Forms
  In this paper, we study the symplectic cohomologies and symplectic harmonic forms which introduced by Tseng and Yau. Based on this, we get if $(M^{2n},\omega)$ is a compact symplectic parabolic manifold which satisfies the hard Lefschetz property, then its Euler number satisfies the inequality $(-1)^n\chi(M)\geq 0$. 
Qiang Tan, Hongyu Wang and Jiuru Zhou
math.SG