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被自身光芒捕获:Wimpzilla、LHAASO膝与弥漫γ射线天穹

Caught by its own light: Wimpzillas, the LHAASO knee and the diffuse $γ$-ray sky

D. Akl, A. J. Iovino, D. Kantzas, A. V. Macciò

arXiv 2609.17315首次发表:更新:

发表机构

Center for Astrophysics and Space Science (CASS), New York University Abu Dhabi(纽约大学阿布扎比分校天体物理学与空间科学中心)

机构由 AI 辅助整理,请以论文原文为准。

AI 中文总结

利用LHAASO质子谱检验PeV能量超重暗物质衰变解释,虽能复现膝结构,但光子数据以数量级优势排除该模型。

AI 中文摘要

我们利用LHAASO在膝区解析的质子谱,在PeV能量下检验核子通道中的超重暗物质。质量$5\cdot 10^{7}$ GeV的遗迹在银河系晕中衰变产生的核子,复现了$0.34$ PeV处的硬化与$3.3$ PeV处的膝,该质量是谱的唯一形状参数,而背景指数在低于$0.1$ PeV的质子斜率独立先验下被剖析。在全部三种强子相互作用模型重建中,该解释同样有效。另一方面,同一级联的光子以约两个数量级排除此解释(相对于宇宙辐射的光子份额),并以约一个数量级排除(相对于LHAASO弥漫银河发射)。

英文摘要

We use the proton spectrum resolved by LHAASO across the knee to test superheavy dark matter in the nucleon channel at PeV energies. Both the hardening at $0.34$ PeV and the knee at $3.3$ PeV are reproduced by nucleons from a relic of mass $5\cdot 10^{7}$ GeV decaying in the Galactic halo, with the mass as the only shape parameter of the spectrum and the background index profiled under an independent prior on the proton slope below $0.1$ PeV. It works equally well in all three hadronic-interaction-model reconstructions. On the other hand, the photons of the same cascade rule out this interpretation by about two orders of magnitude against the photon fraction of the cosmic radiation, and by about one order of magnitude against the LHAASO diffuse Galactic emission.

Comments14 pages plus 3 appendices. 4 figures

论文原文

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