Non-thermal WIMPy baryogenesis from early matter-dominated epoch

Nov 13, 2023, 3:00 PM
The Suites Hotel, Jeju Island, Korea

The Suites Hotel, Jeju Island, Korea

67 Jungmungwangwang-ro 72beon-gil, 특별자치도, Seogwipo-si, Jeju-do


Jongkuk Kim (KIAS)


From satellite-based measurements, the Standard Model (SM) can explain only 5 percent of the energy density of the present Universe, and the baryon density at present infers the existence of baryon asymmetry of the Universe. About 26 percent of energy density consists of Dark Matter (DM), which plays a crucial role in large scale structure formations. In new theoretical models beyond the SM, there are many long-lived massive particles that can dominate the energy density of the Universe, and eventually decay. And, the matter-antimatter asymmetry should be produced after Inflation since the initial abundance of baryon asymmetry is diluted during Inflation. If we consider the early matter-dominated epoch, dark matter can be non-thermally produced during a reheating period, and subsequently annihilate again to lighter SM particles even after the thermal freeze-out. We will discuss the possibility that re-annihilation of dark matter provides the correct baryon asymmetry and the observed relic abundance of DM. In my presentation, I will talk about both DM and baryon asymmetry production with low reheating temperature triggered by the decay of a long-lived massive particle or by evaporation of primordial black holes.

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