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arXiv 2602.22396hep-phastro-ph.CO
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外部磁场中载流弦网络的演化

Current-carrying string network evolution in an external magnetic field

Centro de Astrofísica da Universidade do Porto(波尔图大学天体物理中心);Faculdade de Ciências, Universidade do Porto(波尔图大学理学院);Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto(波尔图大学天文与空间科学研究所)

P. B. Barbosa, C. J. A. P. Martins

AI总结:

本文提出扩展CVOS模型,通过引入外部磁场与载流弦的相互作用,研究其对宇宙弦网络演化的影响,并发现一种使网络获取能量的标度解。

摘要:

宇宙弦是出现在多种宇宙学场景中的拓扑缺陷,当宇宙经历对称破缺相变时出现,其发现将为塑造早期宇宙的高能物理提供有价值见解。为解释此类探测,稳健的理论模型至关重要。速度依赖单尺度(VOS)模型尤其突出:它将网络视为热力学系统,刻画其关键性质,并预测其大尺度演化。最近,该模型已扩展到包含超导宇宙弦,这些弦具有额外的自由度,从而产生电荷-速度依赖单尺度(CVOS)模型。后者的一个局限性是仅包括电荷和电流的损失机制。在此,我们通过现象学方式加入可能的能量源机制,具体是允许载流弦与外部磁场相互作用。我们讨论这种耦合对网络演化的影响,呈现并分类该扩展CVOS模型的物理允许的标度解,并评论外部磁场对网络电荷和电流演化的不同影响。在我们的建模假设下,十个物理上可能的标度解之一使网络能够通过此机制获取能量。

英文摘要:

Cosmic strings are topological defects arising in a variety of cosmological scenarios, as the Universe undergoes symmetry-breaking phase transitions, whose discovery would offer valuable insight into the high-energy physics that shaped the early Universe. To interpret such a detection, robust theoretical models are essential. The Velocity-dependent One-Scale (VOS) model is particularly prominent: it self-consistently treats the network as a thermodynamic system, characterizing its key properties, and predicting its large-scale evolution. This has recently been extended to include superconducting cosmic strings, which carry additional degrees of freedom, giving rise to the Charge-Velocity dependent One-Scale (CVOS) model. One limitation of the latter model is that it only included loss mechanisms for the charge and current. Here, we extend this model by phenomenologically including a possible energy source mechanism, specifically by allowing current-carrying strings interactions with an external magnetic field. We discuss how this coupling impacts the network's evolution, present and classify the physically allowed scaling solutions for this extended CVOS model, and comment on the different impacts of the external magnetic field on the evolution of the network's charge and current. Under our modeling assumptions, one of the ten physically plausible scaling solution enables the network to gain energy by this mechanism.

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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