从$γ$射线级联发展通量极限理论
Developing the Theory of Flux Limits from $γ$-Ray Cascades
摘要：
暗物质湮灭和其他过程可能会沉淀出扩散的超高能$γ$射线流。这些$γ$ -射线可以在当今的实验中观察到，这些实验观察到GeV尺度的扩散通量。然而，宇宙目前对10 TeV以上的$γ$射线是不透明的。一般认为级联辐射在所有高能量下都是可观测的，然而从产生到观测的能量差异对理论通量极限有重要影响。我们详细讨论了级联辐射发展的物理过程，并考虑了能量和红移尺度对由电磁级联产生的任意通量极限的影响。
英文摘要：
Dark matter annihilation and other processes may precipitate a flux of diffuse ultra-high energy $γ$-rays. These $γ$-rays may be observable in present day experiments which observe diffuse fluxes at the GeV scale. Yet the universe is presently opaque to $γ$-rays above 10 TeV. It is generally assumed that cascade radiation is observable at all high energies, however the disparity in energy from production to observation has important consequences for theoretical flux limits. We detail the physics of cascade radiation development and consider the influence of energy and redshift scale on arbitrary flux limits that result from electromagnetic cascade.
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