Comment on: “Quantum dynamics of spin-0 particles in a cosmological space-time”

Abstract

We analyse a recent paper devoted to the investigation of ``the impact of cosmological constant on relativistic quantum systems comprising spin-0 scalar particles''. We show that the authors simplified the radial eigenvalue equations with approximations valid for $r \ll 1$ but solved theresulting simplified eigenvalue equations with boundary conditions for large $r$ in one case and $r \rightarrow \infty$ in the other. We point out that the exact and approximate solutions for one of the models do not agree and show how to overcome the inconsistence.