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Fermi-LAT sensitivity and constraints on dark matter signal from the Milky Way host halo and its substructure.

机译：Fermi-LAT灵敏度和对来自银河系宿主晕及其亚结构的暗物质信号的约束。

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摘要

Despite overwhelming evidence of its existence, the exact nature of Dark Matter (DM) remains unknown. Theoretically well-motivated, Weakly Interacting Massive Particles (WIMPs) make strong candidates for fullling the DM role; they provide gravitational force without participating in the electromagnetic interactions that would make them conventionally visible. Even so, their weak interactions en masse could allow them annihilate or decay into substantial quantities of visible particles, including gamma rays. Continuing observations from the Fermi Large Area Telescope (LAT) provide an opportunity to detect or rule out this possibility. Powerful modern N-body simulations like Via Lactea II make predictions for the distribution and consequent signal of Milky Way (MW) DM substructure for a given WIMP model. Without the fortuitous placement of nearby DM, however, detecting annihilation from a clump would be difficult. Indeed none have yet been conclusively observed. The much larger Host Halo, in whose gravity well the MW resides, constitutes a much more reliable source of possible DM gamma rays. This signal competes with the complex and uncertain background produced by cosmic-ray interactions in the MW medium. A search for DM Host Halo photons including these background systematics gives constraints on the nature of the DM WIMP.
机译：尽管有大量存在的证据，但暗物质（DM）的确切性质仍然未知。从理论上讲，动机良好，弱相互作用的质点粒子（WIMP）是完成DM角色的强大候选人；它们提供引力而不参与电磁相互作用，而电磁相互作用通常会使它们可见。即使这样，它们的弱相互作用也可以使它们them灭或衰减为大量可见粒子，包括伽马射线。费米大面积望远镜（LAT）的连续观测为发现或排除这种可能性提供了机会。强大的现代N体仿真（例如Via Lactea II）可为给定的WIMP模型预测银河系（DM）DM子结构的分布及其信号。但是，如果没有附近DM的偶然放置，则很难从团块中检测到would灭。实际上，尚未有结论性的观察。 MW所在的重力大得多的Host Halo构成了更可靠的DM伽马射线源。该信号与兆瓦介质中宇宙射线相互作用产生的复杂而不确定的背景竞争。搜索包括这些背景系统的DM主机光晕光子会限制DM WIMP的性质。

著录项

  • 作者

    Anderson, Brandon.;

  • 作者单位

    University of California, Santa Cruz.;

  • 授予单位 University of California, Santa Cruz.;
  • 学科 Physics Astrophysics.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 209 p.
  • 总页数 209
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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