Model of mass varying neutrinos in SUSY
Model of mass varying neutrinos in SUSY
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DOI：
10.1016/j.physletb.2005.11.017
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发表时间：
2005-07
影响因子：
4.4
通讯作者：
R. Takahashi;M. Tanimoto
中科院分区：
文献类型：
--
作者：
R. Takahashi;M. Tanimoto
我们讨论了超对称理论中变质量中微子的情形。对于具有单一超场的模型，需要软超对称性破缺项或μ项。然而，需要对一些参数进行微调，以与宇宙学数据保持一致。为了避免微调，我们用两个超场来讨论模型，这与宇宙学数据是一致的。然而，发现左旋中微子与暗扇区的中微子混合最大。加入一个不耦合到暗扇区的右手中微子，我们得到了一个很好的中微子实验现象学模型。在此模型中，宇宙膨胀的减速转化为z≤0.5附近的加速。令w0= - 0.9，即mν =3.17 eV，声速变为虚速。另一方面，如果我们取w0= - 0.998，这导致mν0=0.05 eV， cs2变为正值，因为w在我们的模型中接近当前时代迅速演变。
We discuss the mass varying neutrino scenario in the supersymmetric theory. In the case of the model with the single superfield, one needs the soft SUSY breaking terms or the μ term. However, fine-tunings of some parameters are required to be consistent with the cosmological data. In order to avoid the fine-tuning, we discuss the model with two superfields, which is consistent with the cosmological data. However, it is found that the left-handed neutrino mixes with the neutrino of the dark sector maximally. Adding a right-handed neutrino, which does not couple to the dark sector, we obtain a favorable model in the phenomenology of the neutrino experiments. In this model, the deceleration of the cosmological expansion converts to the acceleration near z≃0.5. The speed of sound csbecomes imaginary if we put w0=−0.9, which corresponds to mν0=3.17 eV. On the other hand, if we take w0=−0.998, which leads to mν0=0.05 eV, cs2becomes positive since w evolves rapidly near the present epoch in our model.