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The local-filament pattern in the anomalous transparency of the Universe for energetic gamma rays
The European Physical Journal C ( IF 4.4 ) Pub Date : 2021-03-30 , DOI: 10.1140/epjc/s10052-021-09051-6
Sergey Troitsky

The propagation length of high-energy photons through the Universe is limited by \(e^{+}e^{-}\) pair production on the extragalactic background radiation. Previous studies reported discrepancies between predicted and observed attenuation, suggesting explanations in terms of new physics. However, these effects are dominated by a limited number of observed sources, while many do not show any discrepancy. Here, we consider the distribution in the sky of these apparently anomalous objects, selected in two very different approaches: the study of unphysical hardenings at distance-dependent energies in deabsorbed spectra of TeV blazars, and the observation of ultra-high-energy air showers from the directions of BL Lac type objects. In both cases, directions to the anomalous sources follow the projected local distribution of galaxies: all the distant sources, contributing to the anomalies, are seen through the local filament. This matches the prediction of the proposed earlier explanation of the anomalies based on mixing of photons with axion-like particles in the filament’s magnetic field. For ultra-high energies, this axion interpretation may be tested by the search of primary gamma rays.

A preprint version of the article is available at ArXiv.


中文翻译:

宇宙反常透明度中高能伽玛射线的局部丝状图样

高能光子通过宇宙的传播长度受到\(e ^ {+} e ^ {-} \)的限制对产生银河外背景辐射。先前的研究报道了预测的衰减与观察到的衰减之间的差异,从而提出了有关新物理学的解释。但是,这些影响主要是由有限数量的观察到的来源所主导,尽管许多都没有显示出任何差异。在这里,我们考虑通过两种截然不同的方法选择的这些明显异常的物体在天空中的分布:研究TeV blazar吸收光谱中距离相关能量的非物理硬化,以及超高能风淋的观察从BL Lac类型对象的方向。在这两种情况下,指向异常源的方向都遵循预计的银河系局部分布:所有引起异常的遥远源都可以通过局部细丝看到。这与基于光子磁场中光子与轴突状颗粒的混合所提出的对异常的早期解释的预测相符。对于超高能量,可以通过搜索原始伽马射线来测试这种轴突解释。

该文章的预印本可在ArXiv上获得。
更新日期:2021-03-30
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