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arXiv 2307.04595hep-ph
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利用近期的 PTA 结果甄选出 SO(10) GUT 模型

Singling out SO(10) GUT models using recent PTA results

Stefan Antusch, Kevin Hinze, Shaikh Saad, Jonathan Steiner

AI总结:

本研究构建了通向 SO(10) GUT 暴胀的超对称模型路径,发现包含两个伴随表示的情景能产生亚稳态宇宙弦网络,其生成的引力波背景与近期 PTA 结果相符并可被观测验证。

摘要:

在本研究中,我们构建了通向 SO(10) GUT 暴胀的有前景的模型构建路径,并考察了其解释近期 PTA 结果的能力,这些结果暗示在纳赫兹频率处存在随机引力波(GW)背景。我们考虑了一个超对称框架,在该框架下无需引入微调即可解决所谓的双态-三态分裂问题。此外,通过使用表示不超过伴随表示的超场,纳入了现实的费米子质量与混合、规范耦合统一以及宇宙暴胀。在三种可能的情景中,其中两种情形需要单个伴随 Higgs 场,且不会产生宇宙弦。相比之下,具有两个伴随表示的第三种情景,能够产生一个亚稳态宇宙弦网络,该网络生成的 GW 背景贡献与近期的 PTA 发现相符,且可被各种正在进行和即将开展的 GW 观测台测试。

英文摘要:

In this work, we construct promising model building routes towards SO(10) GUT inflation and examine their ability to explain the recent PTA results hinting at a stochastic gravitational wave (GW) background at nanohertz frequencies. We consider a supersymmetric framework within which the so-called doublet-triplet splitting problem is solved without introducing fine-tuning. Additionally, realistic fermion masses and mixings, gauge coupling unification, and cosmic inflation are incorporated by utilizing superfields with representations no higher than the adjoint representation. Among the three possible scenarios, two of these cases require a single adjoint Higgs field, and do not lead to cosmic strings. In contrast, the third scenario featuring two adjoints, can lead to a network of metastable cosmic strings that generates a GW background contribution compatible with the recent PTA findings and testable by various ongoing and upcoming GW observatories.

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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