2000 Fiscal Year Final Research Report Summary
CP Violation and Baryogenesis
| Project/Area Number |
11640254
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
素粒子・核・宇宙線
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| Research Institution | University of Tokyo |
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Principal Investigator |
ARAFUNE Jiro Institute for Cosmic Ray Research professor, 宇宙線研究所, 教授 (80013415)
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| Project Period (FY) |
1999 – 2000
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| Keywords | CP / baryon number / F-ball / Q-ball / dark matter / baryon separation |
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| Research Abstract |
1. Nontopological Solitons : Baryogenesis scenarios with nontopological solitons have a remarkable possibility to explain both the baryon number and the dark matter. Among them a Q-ball model is a welknown candidate, and another one is a Fermi-ball model. We have examined allowed region of parameters for Q-balls and Fermi-balls by reanalizing the past experiments with some other original purposes. We obtained a strong constraint Q> 10^<22> for Q-balls, while M>10^<29> GeV or M<10^8GeV for Fermi-balls. In case of Fermi-balls we examined the thermal bath effect on the stability of Fermi-ball and found it should be unstable in the thin wall approximation for Debye length shorter than the radius of the Fermi-ball.
2. Fromulation of Weyle spinors for the reflection/transmission There is a possibility that the phase transition from the phase with SU (2) ×U (1) symmetry to the present vacuum was made in two steps first from the symmetric one to another and then from the one to the present one. In such a case we need a careful treatment of Weyle spinors and we formulated in a simple manner.
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