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Thermal freeze-out or freeze-in during a period of early matter dominationcan give rise to the correct dark matter abundance for $\langle \sigma_{\rmann} v \rangle_{\rm f} < 3 \times 10^{-26}$ cm$^3$ s$^{-1}$. In the standardscenario, a single field that behaves like matter drives the early matterdominated era. However, in realistic models, this epoch may involve more thanone field. In this paper, we study the effect of such a modification on theproduction of dark matter during early matter domination. We show that even asubdominant second field that decays much faster than the dominant one canconsiderably enhance the temperature of the universe during an earlymatter-dominated phase. This in turn affects dark matter production viafreeze-out/in and opens up the allowed parameter space toward significantlylarger dark matter masses. As a result, one can comfortably obtain the correctrelic abundance for PeV-scale dark matter for reheating temperatures at orbelow 10 GeV.

Non-thermal Dark Matter from Modified Early Matter Domination