CP violation at the finite temperature
CP violation at the finite temperature
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DOI：
10.1016/j.physletb.2019.07.025
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Chao Wei
中科院分区：
文献类型：
--
作者：
Chao Wei
In this letter we explore the CP violation at the finite temperature. We show that a spontaneous CP- violating phase φ may arise at the temperature of the electroweak phase transition, and φ can provide a source term for generating the matter-antimatter asymmetry of the universe via the electroweak baryogenesis mechanism (EWBG) whenever the domain wall relating to ±φ vacua is collapsed by a small explicit Z2-breaking term. Therefore no extra CP violation is needed! We further point out that this CP symmetry can be restored after the electroweak phase transition, such that there will be no constraint from the electric dipole moment (EDM) measurements. This study solves the tension between the non- observation of EDMs in precision measurement experiments and the requirement of a large CP violation by the EWBG.
