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We explore a new horizon of modified gravity from the viewpoint of particle physics. As a concrete example, we take the F (R) gravity to raise a question: can a scalar particle (``scalaron'') derived from the F (R) gravity be a dark matter candidate? We place the limit on the parameter in a class of F (R) gravity model from the constraint on the scalaron as a dark matter. The role of the screening mechanism and compatibility with the dark energy problem are addressed.
Katsuragawa et al. (Thu,) studied this question.