A map of the non-thermal WIMP

Understand

We study the effect of the elastic scattering on the non-thermal WIMP, which is produced by direct decay of heavy particles at the end of reheating.

• The non-thermal WIMP becomes important when the reheating temperature is well below the freeze-out temperature.
• Usually, two limiting cases have been considered.
• One is that the produced high energetic dark matter particles are quickly thermalized due to the elastic scattering with background radiations.