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In this paper, we conduct a study on the scalar field obtained from$\mathit{f(R)}$ gravity via Weyl transformation of the spacetime metric$g_{\mu\nu}$ from the Jordan frame to the Einstein frame. The scalar field isobtained as a result of the modification in the geometrical part of Einstein'sfield equation of General Relativity. For the Hu-Sawicki model of$\mathit{f(R)}$ gravity, we find the effective potential of the scalar fieldand calculate its mass. Our study shows that the scalar field (also named asscalaron) obtained from this model has the chameleonic property, i.e.\ thescalaron becomes light in the low-density region while it becomes heavy in thehigh-density region of matter. Then it is found that the scalaron can beregarded as a dark matter (DM) candidate since the scalaron mass is found to bequite close to the mass of ultralight axions, a prime DM candidate. Thus thescalaron in the Hu-Sawicki model of $\mathit{f(R)}$ gravity behaves as DM.Further, a study on the evolution of the scalaron mass with the redshift isalso carried out, which depicts that scalaron becomes light with expansion ofthe Universe and with different rates at different stages of the Universe.

Scalarons mimicking Dark Matter in the Hu-Sawicki model of f(R) gravity