ABSTRACT
Atomic dark matter is usually considered to be produced asymmetrically in the early Universe. In this work, we first propose that the symmetric atomic dark matter can be thermally produced through the freeze-out mechanism. The dominant atom anti-atom annihilation channel is the atomic rearrangement. It has a geometrical cross section much larger than that of elementary fermions. After the atomic formation, this annihilation process further depletes dark matter particles and finally freezes out. To give the observed dark matter relic, the dark atoms are naturally ultraheavy, ranging from 10^6 to 10^10 GeV.
BIOGRAPHY
Dr. Yu-Cheng QIU graduated from Soochow University with his bachelor’s degree in 2017 followed by his PhD in The Hong Kong University of Science and Technology in 2022. Currently he holds a postdoctoral position at Tsung-Dao Lee Institute at Shanghai Jiao Tong University. His research mainly focuses on particle theory and cosmology, with special interests in the axion and sphaleron. Recently, he is interested in the discrete symmetry in our Universe.
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