Baryogenesis and Dark Matter in Multiple Hidden Sectors
arXiv:2206.11314 · doi:10.1103/PhysRevD.109.075003
Abstract
We explore a mechanism for producing the baryon asymmetry and dark matter in models with multiple hidden sectors that are Standard-Model-like but with varying Higgs mass parameters. If the field responsible for reheating the Standard Model and the exotic sectors carries an asymmetry, it can be converted into a baryon asymmetry using the standard sphaleron process. A hidden sector with positive Higgs mass squared can accommodate dark matter with its baryon asymmetry, and the larger abundance of dark matter relative to baryons is due to dark sphalerons being active all the way down the hidden sector QCD scale. This scenario predicts that dark matter is clustered in large dark nuclei and gives a lower bound on the effective relativistic degrees of freedom, , which may be observable in the next-generation cosmic microwave background experiment CMB-S4.
arXiv comment49 pages, 16 figures; matches published version
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