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arXiv 1509.09050astro-ph.HEhep-ph
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cosmic-ray物理学、gamma-ray数据分析和暗物质探测之间的联系

Connections between cosmic-ray physics, gamma-ray data analysis and Dark Matter detection

Daniele Gaggero

摘要:

一个多世纪以来,宇宙射线(CR)物理学一直是一个多产的研究领域。与CR加速、传输和调制相关的未解决问题与对粒子暗物质(DM)的间接搜索有着深刻的联系。特别是,Fermi-LAT发布的高质量伽马射线数据在科学界受到关注,因为最近有一个关于银河系内部异常的说法:因此,将CR相互作用引起的天体物理发射与可能的DM信号分开的必要性是令人信服的,需要深入了解CR物理学的几个重要方面。我在这篇文章中回顾了所有这些联系。在第一部分中,我提出了一个详细的概述最近的结果,关于宇宙射线(CR)的生产和传播的建模:我专注于必要性,以超越标准和简化的图片均匀和均匀的扩散,表明伽玛射线数据指向不同的输运制度在不同地区的银河系;我勾勒出CR观测的大尺度结构的影响,和-关于与日光层的相互作用-我提到的必要性,考虑一个电荷依赖的调制方案。在第二部分中,所有这些方面都与DM问题有关。我分析了银河系内部过剩的说法,并讨论了第一部分中提出的非平凡方面对我们理解这种异常的影响。

英文摘要:

Cosmic-ray (CR) physics has been a prolific field of research for over a century. The open problems related to CR acceleration, transport and modulation are deeply connected with the indirect searches for particle dark matter (DM). In particular, the high-quality gamma-ray data released by Fermi-LAT are under the spotlight in the scientific community because of a recent claim about a inner Galaxy anomaly: The necessity to disentangle the astrophysical emission due to CR interactions from a possible DM signal is therefore compelling and requires a deep knowledge of several non-trivial aspects regarding CR physics. I review all these connections in this contribution. In the first part, I present a detailed overview on recent results regarding modeling of cosmic-ray (CR) production and propagation: I focus on the necessity to go beyond the standard and simplified picture of uniform and homogeneous diffusion, showing that gamma-ray data point towards different transport regimes in different regions of the Galaxy; I sketch the impact of large-scale structure on CR observables, and -- concerning the interaction with the Heliosphere -- I mention the necessity to consider a charge-dependent modulation scenario. In the second part, all these aspects are linked to the DM problem. I analyze the claim of a inner Galaxy excess and discuss the impact of the non-trivial aspects presented in the first part on our understanding of this anomaly.

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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