Coherent Orientations in Floer Theory

In order to define (Hamiltonian or Lagrangian) Floer homology in characteristic 0 (which is desirable in the most general setting for orbifold reasons) it is necessary to provide orientations for moduli spaces of holomorphic curves which are compatible with their boundary (and corner) structures. In this talk we describe a method of producing such coherent orientations via index theory for Hamiltonian and Lagrangian Floer theory (and maybe contact homology).