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arXiv 1503.07749astro-ph.HE
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超高能粒子的宇宙吸收

Cosmic absorption of ultra high energy particles

R. Ruffini, G. V. Vereshchagin, S. -S. Xue

摘要:

本文综述了超高能粒子在宇宙中传播的极限,它是由超高能粒子与宇宙背景光子和中微子的相互作用所决定的。通过考虑这些背景的宇宙演化,并考虑适当的相互作用,我们得到了超高能光子,质子和中微子的平均自由程。对于光子来说,相关的过程是布莱特-惠勒过程和双电子对产生过程。对于质子,相关的反应是质子生成和贝特-海特勒过程。讨论了Bethe-Heitler过程的能量损失长度与平均自由程之间的相互影响。中微子的不透明度是由它对宇宙背景中微子的散射决定的。我们首次计算了高能中微子视界作为其能量的函数。

英文摘要:

This paper summarizes the limits on propagation of ultra high energy particles in the Universe, set up by their interactions with cosmic background of photons and neutrinos. By taking into account cosmic evolution of these backgrounds and considering appropriate interactions we derive the mean free path for ultra high energy photons, protons and neutrinos. For photons the relevant processes are the Breit-Wheeler process as well as the double pair production process. For protons the relevant reactions are the photopion production and the Bethe-Heitler process. We discuss the interplay between the energy loss length and mean free path for the Bethe-Heitler process. Neutrino opacity is determined by its scattering off the cosmic background neutrino. We compute for the first time the high energy neutrino horizon as a function of its energy.

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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