Study of production mechanism of universe's baryon number and neutrino masses

宇宙重子数和中微子质量产生机制研究

• 批准号: 16540230
• 负责人: YANAGIDA Tsutomu
• 金额: $ 0.96万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540230/
• 关键词: neutrino; universe's baryon number; inflation universe; supersymmetry; supergravity; gravitino; ニュートリノの質量

The seesaw mechanism that explains naturally the observed small neutrino masses predicts heavy Majorana neutrinos. It is known that the decay of the heavy Majorana neutrinos produce lepton asymmetry which is converted to the baryon asymmetry. Thus, one may explain the baryon-number asymmetry in the universe by the decay of the Majorana neutrino decay. In the present project we have shown that it is indeed the case and that the observed neutrino masses are very consistent with the mechanism of the above baryogenesis. In particular, we have considered inflation models based on supergravity and found that most of the inflation models produce too much gravitinos if the above baryogenesis takes place. We have also found that gauge and anomaly mediation scenarios for supersymmetry breaking do not suffer from this problem. Therefore the present baryogenesis scenario based on the decay of heavy Majorana neutrinos predicts certain spectra of super-particles at low energies, which will be tested at the near future collider experiments such as LHC.

跷跷板机制，自然地解释了观察到的小中微子质量预测重马约拉纳中微子。重马约拉纳中微子的衰变产生轻子不对称性，轻子不对称性转化为重子不对称性。因此，我们可以用马约拉纳中微子衰变来解释宇宙中重子数的不对称性。在目前的项目中，我们已经证明了情况确实如此，并且观察到的中微子质量与上述重子生成机制非常一致。特别是，我们考虑了基于超引力的暴胀模型，发现如果发生上述重子生成，大多数暴胀模型都会产生过多的引力子。我们还发现，规范和异常调解方案的超对称性破缺不受这个问题。因此，目前基于重马约拉纳中微子衰变的重子生成方案预测了低能超粒子的某些光谱，这些光谱将在不久的将来的对撞机实验（如LHC）中进行测试。

项目成果

Thermal leptogenesis and gauge mediation.

热轻子发​​生和规范调解。

• 发表时间: 2004
• 期刊: Physical Review D 69
• 作者: M.Fujii;M.Ibe;T.Yanagida
• 通讯作者: T.Yanagida

REALIZATION OF MINIMAL SUPERGRAVITY

最小超重力的实现

• 发表时间: 2005
• 期刊: Physical Review D70
• 作者: M.Ibe;T.Yanagida
• 通讯作者: T.Yanagida

The gravitino overproduction problem in inflationary universe

暴胀宇宙中的引力过剩问题

• 发表时间: 2006
• 期刊: Phys.Rev. D74
• 作者: M. Kawasaki;F. Takahashi;T. T. Yanagida
• 通讯作者: T. T. Yanagida

Minimal supergravity, inflation, and all that.

最小的超重力、通货膨胀等等。

• 发表时间: 2006
• 期刊: Physics Letters B 637
• 作者: M.Ibe;K.-I.Izawa;Y.Shinbara;T.T.Yanagida
• 通讯作者: T.T.Yanagida

Gravitino Overproduction in Inflaton Decay

• DOI: 10.1016/j.physletb.2006.05.037
• 发表时间: 2006-03
• 期刊: arXiv: High Energy Physics - Phenomenology
• 作者: M. Kawasaki;F. Takahashi;T. Yanagida