Displaceability and the mean Euler characteristic
  In this note we show that the mean Euler characteristic of equivariant symplectic homology is an effective obstruction against the existence of displaceable exact contact embeddings. As an application we show that certain Brieskorn manifolds do not admit displaceable exact contact embeddings. 
Urs Frauenfelder, Felix Schlenk, Otto van Koert
math.SG