arXiv 2307.045822023-07hep-phastro-ph.COhep-th

来自熔化畴壁的NANOGrav谱指数$\gamma=3$

NANOGrav spectral index $γ=3$ from melting domain walls

E. Babichev, D. Gorbunov, S. Ramazanov, R. Samanta, A. Vikman

备注：: 7 revtex pages, 1 figure; added references and appendix with the calculation of gravitational wave spectrum; matches version accepted in PRD
发表信息：: Phys. Rev. D 108, 123529 (2023)
DOI：: 10.1103/PhysRevD.108.123529

AI总结：

本研究提出早期宇宙中张力随膨胀红移的熔化畴壁模型，其辐射引力波的谱指数$\gamma=3$匹配NANOGrav 15年数据，对应弱耦合超轻标量暗物质候选者，质量低于$10^{-11}-10^{-12}\\,\text{eV}$，可通过黑洞超辐射观测验证。

摘要：

我们讨论了由张力随宇宙膨胀红移所描述的宇宙畴壁。这类熔化畴壁会辐射引力波，其低频谱形为$\Omega_{gw}\propto f^{2}$，对应谱指数$\gamma=3$，与近期NANOGrav 15年数据的偏好结果一致。我们探讨了一种可在早期宇宙中产生此类熔化畴壁网络的具体高能物理场景，该场景涉及一个弱耦合标量场，它可作为有潜力的暗物质候选者。我们确定了与NANOGrav数据中观测到的引力波特征相匹配的模型参数。暗物质质量被推至$10^{-11}-10^{-12}\\,\text{eV}$以下的超轻范围，借助旋转黑洞的超辐射效应，该质量范围可通过规划中的观测进行探测。

英文摘要：

We discuss cosmic domain walls described by a tension red-shifting with the expansion of the Universe. These melting domain walls emit gravitational waves with the low-frequency spectral shape $Ω_{gw}\propto f^{2}$ corresponding to the spectral index $γ=3$ favoured by the recent NANOGrav 15 yrs data. We discuss a concrete high-energy physics scenario leading to such a melting domain wall network in the early Universe. This scenario involves a feebly coupled scalar field, which can serve as a promising dark matter candidate. We identify parameters of the model matching the gravitational wave characteristics observed in the NANOGrav data. The dark matter mass is pushed to the ultra-light range below $10^{-11}-10^{-12}\,\text{eV}$ which is accessible through planned observations thanks to the effects of superradiance of rotating black holes.

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英文摘要：

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