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Abstract
We find that a pseudo-Nambu-Goldstone boson (pNGB) with an initial misalignment angle can drive successful spontaneous baryogenesis, and become dark matter if its potential is enhanced at high temperatures. The behavior is achievable through non-restoration of the global symmetry with a dimension-five explicit breaking operator. In this setup, the pNGB starts its motion with an initial sliding across rapidly decreasing potential barriers during which the baryon asymmetry is frozen, and later it oscillates as dark matter when its mass and decay constant are saturated.
Our scenario predicts the pNGB mass of around 1eV and its decay constant of around 106 GeV, with mixing angle of O(10-4) with the Higgs boson. Applied to the Majoron in the type-I seesaw model, the heaviest right-handed neutrino would be about 100 GeV, with additional singlet scalars at a similar scale. These predictions are testable in kaon experiments, heavy neutral lepton searches, LHC, and future colliders.
Biography
Dr. Jin Sun received his Ph.D. from the Tsung-Dao Lee Institute, Shanghai Jiao Tong University in 2023. He is currently a postdoctoral researcher in Korea Institute for Basic Science. His research includes high-energy particle physics, specifically in new physics model building and phenomenology. He has published 14 papers in journals, such as JHEP, PRD, PLB, and NPB.
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