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arXiv 1409.6979hep-phastro-ph.CO
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隐藏领域中的宇宙弦:2。宇宙学和天体物理学特征

Cosmic Strings in Hidden Sectors: 2. Cosmological and Astrophysical Signatures

Andrew J. Long, Tanmay Vachaspati

摘要:

宇宙弦可以出现在具有自发破缺阿贝尔对称群的隐藏扇区模型中。我们在配套的论文中研究了标准模型场与这些所谓的暗弦的耦合。在这里,我们调查的宇宙学和天体物理学观测值,可能与暗弦在我们的宇宙中的存在,重点是低尺度模型,也许TeV。具体来说,我们考虑核合成和CMB光谱失真的约束,我们计算的扩散伽马射线级联光子和宇宙射线的预测通量。对于像TeV那样轻的弦,我们发现这些签名的预测水平远低于当前实验的灵敏度,因此隐藏扇区中的低尺度宇宙弦仍然不受约束。质量尺度在10^(13)GeV到10^(15)GeV之间的较重弦在核合成约束下处于张力状态。

英文摘要:

Cosmic strings can arise in hidden sector models with a spontaneously broken Abelian symmetry group. We have studied the couplings of the Standard Model fields to these so-called dark strings in the companion paper. Here we survey the cosmological and astrophysical observables that could be associated with the presence of dark strings in our universe with an emphasis on low-scale models, perhaps TeV. Specifically, we consider constraints from nucleosynthesis and CMB spectral distortions, and we calculate the predicted fluxes of diffuse gamma ray cascade photons and cosmic rays. For strings as light as TeV, we find that the predicted level of these signatures is well below the sensitivity of the current experiments, and therefore low scale cosmic strings in hidden sectors remain unconstrained. Heavier strings with a mass scale in the range 10^(13) GeV to 10^(15) GeV are at tension with nucleosynthesis constraints.

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