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arXiv 1002.0981hep-ph
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CP破坏对早期宇宙中微子简并参数的影响

CP violation effects on the neutrino degeneracy parameters in the Early Universe

J. Gava, C. Volpe

摘要:

我们探讨可能的CP违反的影响,来自狄拉克阶段的Maki-Nakagawa-Sakata-Pontecorvo矩阵,中微子简并参数,在大爆炸核合成的时代。我们首先证明的条件下,这种影响可能会出现。特别是它需要不同的初始μ介子和τ中微子简并参数。然后数值求解了三味中微子密度矩阵的动力学方程,目的是量化狄拉克相位对电子中微子简并度参数的影响。计算包括真空项、与物质的耦合、中微子-中微子相互作用和碰撞。对电子中微子简并参数的影响可达近1.%和约0.1%的Yp被发现,取决于初始条件。

英文摘要:

We explore possible CP violating effects, coming from the Dirac phase of the Maki-Nakagawa-Sakata-Pontecorvo matrix, on the neutrino degeneracy parameters, at the epoch of Big-Bang nucleosynthesis. We first demonstrate the conditions under which such effects can arise. In particular it requires that the initial muon and tau neutrino degeneracy parameters differ. Then we solve numerically the kinetic equations for the three flavour neutrino density matrix with the goal of quantifying the impact of the Dirac phase on the electron neutrino degeneracy parameter. The calculations include the vacuum term, the coupling to matter, the neutrino-neutrino interaction and the collisions. Effects on electron neutrino degeneracy parameter up to almost 1.% and on Yp of about 0.1% are found, depending on the initial conditions.

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