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We investigate the turnaround radius of the Reissner-Nordstr\"{o}m deSitterSpacetime and how the turnaround radius changes if a test particle carriescharge. We also consider the Mart\'{i}nez-Troncoso-Zanelli (MTZ) solution ofconformally coupled gravity and investigate how the turnaround radius changesfor a scalar test charge. In both scalar and electric interaction cases we findthat the Turnaround Radius depends on the particle's energy.

Turnaround Radius for charged particles in the Reissner-Nordstr\"{o}m deSitter spacetime