WIMP/FIMP dark matter and primordial black holes with memory burden effect (2506.20071v1)

Abstract: The lifetime of primordial black holes (PBHs), which were formed in the early universe, can be extended by the memory burden effect. Light PBHs may be in existence today and become a candidate for dark matter (DM). We assume that DM is made of thermally produced weakly interacting massive particles (WIMPs), WIMPs produced via Hawking radiation of PBHs, and survived PBHs via the memory burden effect. In addition, feebly interacting massive particles (FIMPs) are considered as an alternative to WIMPs. Various similar studies have been conducted either with or without considering the memory burden effect. In this study, we simultaneously account for thermally produced WIMPs or FIMPs and the memory burden effect of PBHs to explain the relic abundance of DM. We show that this abundance is highly sensitive to the memory burden effect in PBHs.