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arXiv 2202.00523astro-ph.COastro-ph.HEhep-ph
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Gamma-ray宇宙学与基础物理实验

Gamma-ray Cosmology and Tests of Fundamental Physics

J. Biteau, M. Meyer

摘要:

伽马射线在宇宙学距离上的传播是GeV和TeV能量的广泛理论和观测研究的主题。宇宙网中伽马射线的平均自由程被限制在100 GeV以上,这是由于在宇宙光学和红外背景上产生电子和正电子。电子和正电子在星系际介质中冷却,同时在其磁场中旋转,这可能导致其全球加热或产生较低能量的次级伽马射线。在宇宙学旅程中幸存下来的伽马射线的能量分布携带着观测到的吸收特征,这些特征测量了重子物质在宇宙时间内的发射率,限制了$Λ$ CDM宇宙学的距离尺度,并限制了相互作用截面的变化。竞争性的限制特别是放在宇宙恒星形成的历史,以及在量子引力和弦论预期的现象,如耦合到假设的轴子类粒子或违反洛伦兹不变性。最新的理论和观测进展使人们得以一窥新一代伽马射线观测站即将开启的多波长和多信使路径。

英文摘要:

The propagation of gamma-rays over cosmological distances is the subject of extensive theoretical and observational research at GeV and TeV energies. The mean free path of gamma-rays in the cosmic web is limited above 100 GeV due to the production of electrons and positrons on the cosmic optical and infrared backgrounds. Electrons and positrons cool in the intergalactic medium while gyrating in its magnetic fields, which could cause either its global heating or the production of lower-energy secondary gamma-rays. The energy distribution of gamma-rays surviving the cosmological journey carries observed absorption features that gauge the emissivity of baryonic matter over cosmic time, constrain the distance scale of $Λ$CDM cosmology, and limit the alterations of the interaction cross section. Competitive constraints are in particular placed on the cosmic star-formation history as well as on phenomena expected from quantum gravity and string theory, such as the coupling to hypothetical axion-like particles or the violation of Lorentz invariance. Recent theoretical and observational advances offer a glimpse of the multi-wavelength and multi-messenger path that the new generation of gamma-ray observatories is about to open.

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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