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arXiv 0704.3044astro-phhep-ph
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TeV gamma-ray源谱中的类轴子特征

Signatures of axion-like particles in the spectra of TeV gamma-ray sources

Alessandro Mirizzi, Georg G. Raffelt, Pasquale D. Serpico

摘要:

在PVLAS实验中观察到的无法解释的签名的一种解释调用了一种新的具有双光子顶点的类轴子粒子(ALP),允许在存在磁场的情况下进行光子ALP振荡。在PVLAS建议的质量和耦合范围内,同样的效应会导致高能光子源的特殊变暗。对于星系中湍流磁场的典型参数,效应在E_gamma >~ 10 TeV时开始,在TeV伽马源的光谱中提供ALP签名,可以用切伦科夫望远镜探测。如果正在进行的光子再生实验证实了PVLAS粒子的解释,一个专门的搜索将是强烈的动机。

英文摘要:

One interpretation of the unexplained signature observed in the PVLAS experiment invokes a new axion-like particle (ALP) with a two-photon vertex, allowing for photon-ALP oscillations in the presence of magnetic fields. In the range of masses and couplings suggested by PVLAS, the same effect would lead to a peculiar dimming of high-energy photon sources. For typical parameters of the turbulent magnetic field in the galaxy, the effect sets in at E_gamma >~ 10 TeV, providing an ALP signature in the spectra of TeV gamma sources that can be probed with Cherenkov telescopes. A dedicated search will be strongly motivated if the ongoing photon regeneration experiments confirm the PVLAS particle interpretation.

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