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arXiv 2502.03328astro-ph.COhep-ph
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利用COB强度通过磁偶极矩对衰变惰性中微子的约束

Bounds on decaying sterile neutrinos via magnetic dipole moment from COB intensity

Hriditi Howlader, Vivekanand Mohapatra, Alekha C. Nayak, Tripurari Srivastava

AI总结:

本文利用新视野号LORRI测得的COB反常强度,研究keV量级辐射衰变惰性中微子作为暗物质候选者的贡献,并由此导出其跃迁磁偶极矩的上限约束。

摘要:

美国国家航空航天局(NASA)新视野号(New Horizons)搭载的远程侦察成像仪(LORRI)最近的一次观测给出了宇宙光学背景(COB)迄今最精确的测量结果。报告给出的COB强度为$11.16\pm 1.35$ $\mathrm{nW/m^2/sr}$,其基准波长为$λ_{piv} = 0.608 \\, μ\mathrm{m}$,观测范围为\\( 0.4 \\, μ\mathrm{m} \lesssim λ\lesssim 0.9 \\, μ\mathrm{m} \\)。在从深度哈勃空间望远镜计数、弥散银河光和明亮前景恒星的散射光中扣除所测强度之后,发现存在$2.99 \pm 2.03~\mathrm{nW/m^2/sr}$的反常强度。我们考虑了keV质量量级的辐射衰变惰性中微子作为暗物质候选者,它们可能对这一报告的反常强度有贡献。利用这一观测结果,我们导出了惰性中微子到惰性中微子跃迁磁偶极矩的上限。我们发现,质量在$\mathcal{O}(\rm keV)$量级的惰性中微子,其跃迁磁偶极矩取值在$ 3\times 10^{-13}\\,\rm eV^{-1} - 10^{-9}\\,\rm eV^{-1}$范围内,可以解释$2.99\pm 2.03\\,\rm nW/m^2/sr$的反常强度。未来实验,如光学-紫外研究用宇宙学先进巡天望远镜(CASTOR)、詹姆斯·韦布空间望远镜(JWST)以及宇宙历史、再电离时期和冰探测器光谱光度计(SPHEREx),可能有助于我们对惰性中微子导出更好的约束。

英文摘要:

A recent observation by Long Range Reconnaissance Imager (LORRI) mounted on NASA's New Horizons yielded the most accurate measurement of the cosmic optical background (COB). The reported COB intensity is $11.16\pm 1.35$ $\mathrm{nW/m^2/sr}$ at a pivot wavelength $ λ_{piv} = 0.608 \, μ\mathrm{m}$ observed in the range \( 0.4 \, μ\mathrm{m} \lesssim λ\lesssim 0.9 \, μ\mathrm{m} \). After subtracting the measured intensity from the deep Hubble Space Telescope count, diffused galactic light, and scattered light from bright star foregrounds, an anomalous intensity of $2.99 \pm 2.03~\mathrm{nW/m^2/sr}$ has been found. We considered radiatively decaying sterile neutrinos of keV mass scale, as dark matter candidate, that could contribute to this anomalous reported intensity. Using this, we derive upper bounds on the sterile-to-sterile transition magnetic moment. We find that sterile neutrinos with mass of $\mathcal{O}(\rm keV)$ scale take values of the transition magnetic moment in the range $ 3\times 10^{-13}\,\rm eV^{-1} - 10^{-9}\,\rm eV^{-1}$ to explain the anomalous intensity of $2.99\pm 2.03\,\rm nW/m^2/sr$. % Future experiments such as, Cosmological Advanced Survey Telescope for Optical-UV Research (CASTOR), James Web Space Telescope (JWST), and Spectro-Photometer for the history of the Universe, Epoch of Reionization, and Ices Explorer (SPHEREx) might help us derive a better bound on the sterile neutrinos.

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