Turnaround Radius for charged particles in the Reissner-Nordström deSitter spacetime

We investigate the turnaround radius of the Reissner-Nordström deSitter Spacetime and how the turnaround radius changes if a test particle carries charge. We also consider the Martínez-Troncoso-Zanelli (MTZ) solution of conformally coupled gravity and investigate how the turnaround radius changes for a scalar test charge. In both scalar and electric interaction cases we find that the Turnaround Radius depends on the particle’s energy.