Different realizations of kappa-momentum space and relative-locality   effect
  We consider different realizations for the momentum sector of kappa-Poincare Hopf algebra, which is associated with a curved momentum space. We show that the notion of the particle mass as introduced recently by Amelino-Camelia et al. in the context of relative-locality is realization independent for a wide class of realizations, up to linear order in deformation parameter l. On the other hand, the time delay formula clearly shows a dependence on the choice of realization. 
Stjepan Meljanac, Anna Pachol, Andjelo Samsarov, Kumar S. Gupta
hep-th