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arXiv 2205.01079hep-phastro-ph.COhep-ex
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根据LORRI异常衰变暗物质的各向异性宇宙光学背景

Anisotropic cosmic optical background bound for decaying dark matter in light of the LORRI anomaly

Kazunori Nakayama, Wen Yin

摘要:

最近,新地平线观测报告了宇宙光学背景(COB)中的异常通量。COB的流量是$16.37\pm 1.47\, \rm nW m^{-2} sr^{-1}$,在LORRI枢轴波长$0.608\,\rm μm$,这是$\sim 4σ$水平以上的预期流量从哈勃太空望远镜(HST)星系计数。如果这是电子伏特尺度的暗物质衰变为光子的暗示,那就太好了。在本文中,我们指出,这样一个衰减的暗物质模型预测大量的各向异性的COB通量,这是准确测量的HST。HST的数据排除了在$5$ - $20$ eV质量范围内大于$10^{-24}$-$10^{-23}\,{\rm s}^{-1}$的主导冷暗物质的衰变率。因此,衰变的冷暗物质解释了COB过剩是强烈不利的各向异性约束。我们讨论了一些漏洞:例如热/热暗物质或暗物质的两步衰变,以解释COB过量。

英文摘要:

Recently anomalous flux in the cosmic optical background (COB) has been reported by the New Horizon observations. The COB flux is $16.37\pm 1.47\, \rm nW m^{-2} sr^{-1}$, at the LORRI pivot wavelength of $0.608\,\rm μm$, which is $\sim 4σ$ level above the expected flux from the Hubble Space Telescope (HST) galaxy count. It would be great if this were a hint for the eV scale dark matter decaying into photons. In this paper, we point out that such a decaying dark matter model predicts a substantial amount of anisotropy in the COB flux, which is accurately measured by the HST. The data of the HST excludes the decay rate of the dominant cold dark matter larger than $10^{-24}$-$10^{-23}\,{\rm s}^{-1}$ in the mass range of $5$-$20$eV. As a result, the decaying cold dark matter explaining the COB excess is strongly disfavored by the anisotropy bound. We discuss some loopholes: e.g. warm/hot dark matter or two-step decay of the dark matter, to explain the COB excess.

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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