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arXiv 1209.3173astro-ph.HEnucl-th
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维里膨胀核塌缩超新星中的带电中微子相互作用

Charged current neutrino interactions in core-collapse supernovae in a virial expansion

C. J. Horowitz, G. Shen, Evan O'Connor, Christian Ott

摘要:

核心坍缩超新星可能敏感地依赖于在温暖的低密度富中子物质中的带电中微子相互作用。在富中子物质中,质子比中子束缚得更紧。该能量移动ΔU增加了ν_e + n --> p + e中的电子能量,从而增加了可用的相空间和吸收截面。同样,ΔU降低了\bar v_e + p --> n + e^+中的正电子能量,从而减小了相空间和截面。我们用一个与模型无关的维里展开计算了ΔU,发现在低密度下,ΔU比许多平均场模型的预测大得多。因此,ΔU可能对超新星中的带电中微子相互作用有重大影响。对核心坍缩超新星吸积相的初步模拟发现,ΔU增加了\bar的ν e能量,降低了ν e光度。

英文摘要:

Core-collapse supernovae may depend sensitively on charged current neutrino interactions in warm, low density neutron rich matter. A proton in neutron rich matter is more tightly bound than is a neutron. This energy shift ΔU increases the electron energy in ν_e + n --> p + e, increasing the available phase space and absorption cross section. Likewise ΔU decreases the positron energy in \bar ν_e + p --> n + e^+, decreasing the phase space and cross section. We have calculated ΔU using a model independent virial expansion and we find ΔU is much larger, at low densities, than the predictions of many mean field models. Therefore ΔU could have a significant impact on charged current neutrino interactions in supernovae. Preliminary simulations of the accretion phase of core-collapse supernovae find that ΔU increases \bar ν_e energies and decreases the ν_e luminosity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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