微类星体喷流中中微子的退相干效应
Decoherence effect in neutrinos produced in micro-quasar jets
摘要：
研究了退相干对微类星体喷注中中微子谱的影响。为了分析中微子极化矢量的进动，我们通过求解相应的运动方程，并假设两种不同的情况，即（i）两个活动中微子之间的混合，和（ii）一个活动中微子和一个无活动中微子之间的混合，计算了它的时间演化。我们发现，对于两个活跃中微子和大的中微子-中微子相互作用值的情况下，退相干的开始是不明显的。对于活跃-无菌方案，如果中微子-中微子相互作用的强度（$μ$）和质量差平方与能量之比（$ω=\frac{δm^2}{2 E}$）满足关系式$\fracμ{w_{E=E_{\rm min}}}>0.1$，则消相干变得明显。
英文摘要：
We study the effect of decoherence upon the neutrino spectra produced in micro-quasar jets. In order to analyse the precession of the polarization vector of neutrinos we have calculated its time evolution by solving the corresponding equations of motion, and by assuming two different scenarios, namely: (i) the mixing between two active neutrinos, and (ii) the mixing between one active and one sterile neutrino. We have found that for the case with two active neutrinos and large values of the neutrino-neutrino interactions the onset of decoherence is not manifest. For the active-sterile scheme decoherence becomes manifest if the strength of the neutrino-neutrino interactions ($μ$) and the ratio between the square-mass difference and the energy ($ω=\frac{δm^2}{2 E}$) satisfy the relation $\fracμ{w_{E=E_{\rm min}}}>0.1$.
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