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The initial density of dark matter (DM) particles, otherwise secluded fromthe standard model (SM), may be generated at reheating, with an initialtemperature ratio for internal thermalizations, $\xi_i=T_{\rm DM,i}/T_{\rmSM,i}$. This scenario necessarily implies inflaton-mediated scatterings betweenDM and SM after reheating, with a rate fixed by the relic abundance of DM andthe reheat temperature. These scatterings can be important for an inflaton massand reheat temperature as high as $\mathcal{O}(10^7 {~\rm GeV})$ and$\mathcal{O}(10^9{~\rm GeV})$, respectively, since the thermally averagedcollision terms become approximately independent of the inflaton mass when thebath temperature is larger than the mass. The impact of these scatterings on DMcosmology is studied modeling the perturbative reheating physics by agauge-invariant set of inflaton interactions upto dimension-5 with the SM gaugebosons, fermions and the Higgs fields. It is observed that an initially lower(higher) DM temperature will rapidly increase (decrease), even with very smallcouplings to the inflaton. There is a sharp lower bound on the DM mass belowwhich the relic abundance cannot be satisfied due to faster back-scatteringsdepleting DM quanta to SM particles. For low DM masses, the CMB constraintsbecome stronger due to the collisions for $\xi_i<1$, probing values as small as$\mathcal{O}(10^{-4})$, and weaker for $\xi_i>1$. The BBN constraints becomestronger due to the collisions for lower DM masses, probing $\xi_i$ as small as$\mathcal{O}(0.1)$, and weaker for higher DM mass. Thus inflaton-mediatedcollisions with predictable rates, relevant even for high-scale inflationmodels, can significantly impact the cosmology of light DM.

Cosmological implications of inflaton-mediated dark and visible matter scatterings after reheating