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arXiv 1011.2636hep-thgr-qchep-ph
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稳定带电宇宙弦

Stable charged cosmic strings

H. Weigel, M. Quandt, N. Graham

摘要:

本文在简化的标准模型中研究了重费米子二重态对宇宙弦的量子稳定性。我们表明,带电的字符串,通过填充费米束缚态水平,变得稳定,如果电-弱玻色子耦合到一个费米子,这是不到两倍的重顶夸克。这个结果表明,在标准模型中,束缚宇宙弦并不需要非常大的费米子质量或不切实际的耦合。在数值上,我们发现最有利的弦轮廓是一个简单的“槽”的希格斯vev半径$\approx 10^{-18}\,\mathrm{m}$。真空在我们的模型中保持稳定,因为中性弦在能量上不受青睐。

英文摘要:

We study the quantum stabilization of a cosmic string by a heavy fermion doublet in a reduced version of the standard model. We show that charged strings, obtained by populating fermionic bound state levels, become stable if the electro--weak bosons are coupled to a fermion that is less than twice as heavy as the top quark. This result suggests that extraordinarily large fermion masses or unrealistic couplings are not required to bind a cosmic string in the standard model. Numerically we find the most favorable string profile to be a simple "trough" in the Higgs vev of radius $\approx 10^{-18}\,\mathrm{m}$. The vacuum remains stable in our model, because neutral strings are not energetically favored.

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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