A variational approach to Givental's nonlinear Maslov index
  In this article we consider a variant of Rabinowitz Floer homology in order to define a homological count of discriminant points for paths of contactomorphisms. The growth rate of this count can be seen as an analogue of Givental's nonlinear Maslov index. As an application we prove a Bott-Samelson type obstruction theorem for positive loops of contactomorphisms. 
Peter Albers, Urs Frauenfelder
math.SG math.DG math.GT