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arXiv 0906.5294hep-ph
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超新星中的冲击波:对超新星中微子扩散背景的新影响

Shockwaves in Supernovae: New Implications on the Diffuse Supernova Neutrino Background

Sebastien Galais, James Kneller, Cristina Volpe, Jerome Gava

摘要:

我们利用流体动力学模拟得到的动力学剖面研究了冲击波对漫超新星中微子背景的影响,并利用S-矩阵方法计算了中微子演化的三种形式.我们表明,冲击波的影响是显着的,并介绍了修改的遗物通量约$20 \%$和相关的事件率在$10-20 \%$的水平。这样的效应是重要的,因为它与当考虑不同振荡情形(即,层级或$θ_{13}$)时引入的速率变化具有相同的量级。此外,由于冲击波,在倒置层次中,当$\sin^2 2 θ_{13}$在Dopez极限和$10^{-5}$之间时,速率对集体效应变得不那么敏感。我们提出了一个简化的模型来解释冲击波的影响,在未来的预测。

英文摘要:

We investigate shock wave effects upon the diffuse supernova neutrino background using dynamic profiles taken from hydrodynamical simulations and calculating the neutrino evolution in three flavors with the S-matrix formalism. We show that the shock wave impact is significant and introduces modifications of the relic fluxes by about $20 \%$ and of the associated event rates at the level of $10-20 \%$. Such an effect is important since it is of the same order as the rate variation introduced when different oscillation scenarios (i.e. hierarchy or $θ_{13}$) are considered. In addition, due to the shock wave, the rates become less sensitive to collective effects, in the inverted hierarchy and when $\sin^2 2 θ_{13}$ is between the Chooz limit and $10^{-5}$. We propose a simplified model to account for shock wave effects in future predictions.

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