Abstract
In this paper, we study about the wellposedness of scalar wave equation on Robertson-Walker universe as a background with zero spatial curvature, k = 0. We start from non-minimal Lagrangian for scalar field on curved background with potential turned on. Then we derive the equations of motion and tensor energy-momentum. After that we specify our case to k = 0. Finally, we prove the local existence and uniqueness of the solution of the equation of motion.
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