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arXiv 0903.5247hep-phastro-ph.HE
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Cosmic ray膝关节和TeV量表的新物理学

Cosmic ray knee and new physics at the TeV scale

Roberto Barcelo, Manuel Masip, Iacopo Mastromatteo

备注：
10 pages, version to appear in JCAP
发表信息：
JCAP 0906:027,2009
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摘要：

我们分析了宇宙射线膝关节出现在能量阈值的质子-暗物质截面变大，由于新的TeV物理的可能性。它已经表明，这种相互作用可以打破质子，并产生一个弥漫的伽马射线通量与MILAGRO观测一致。我们认为，这一假设意味着膝盖的规模与原子质量为不同的核，KASKADE数据似乎表明。我们发现，为了解释通量中谱指数从E^{-2.7}到E^{-3.1}的变化，截面必须在膝盖以上像E^{0.4+β}那样增长，其中β=0.3-0.6参数化了到达地球的宇宙射线的年龄（τ \propto E^{-β}）的能量依赖性。该假说还需要mbarn的截面（可以用TeV的引力来模拟）和大密度的暗物质（可以聚集在宇宙射线的来源周围）。我们认为中微子在E=（m_x/m_p）E_{knee} \approx 10^8 GeV时也会表现出一个阈值，在这个阈值处它们与核子的相互作用变得很强。因此，在ICECUBE或ANITA观测到超过这个阈值的标准中微子事件将反驳这种情况。

英文摘要：

We analyze the possibility that the cosmic ray knee appears at an energy threshold where the proton-dark matter cross section becomes large due to new TeV physics. It has been shown that such interactions could break the proton and produce a diffuse gamma ray flux consistent with MILAGRO observations. We argue that this hypothesis implies knees that scale with the atomic mass for the different nuclei, as KASKADE data seem to indicate. We find that to explain the change in the spectral index in the flux from E^{-2.7} to E^{-3.1} the cross section must grow like E^{0.4+β} above the knee, where β=0.3-0.6 parametrizes the energy dependence of the age (τ\propto E^{-β}) of the cosmic rays reaching the Earth. The hypothesis also requires mbarn cross sections (that could be modelled with TeV gravity) and large densities of dark matter (that could be clumped around the sources of cosmic rays). We argue that neutrinos would also exhibit a threshold at E=(m_χ/m_p)E_{knee}\approx 10^8 GeV where their interaction with a nucleon becomes strong. Therefore, the observation at ICECUBE or ANITA of standard neutrino events above this threshold would disprove the scenario.

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