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arXiv 2105.03438astro-ph.COastro-ph.HEhep-ph
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速度抑制暗物质湮灭的最佳观测策略

Optimal observing strategies for velocity-suppressed dark matter annihilation

Nolan Smyth, Gabriela Huckabee, Stefano Profumo

摘要:

许多宇宙学暗物质的粒子模型都有一个配对湮灭率,它与湮灭粒子之间的相对速度的幂成比例。因此,在特定的环境引力势下,暗物质晕中心区域的湮灭率可能显著低于晕外围。虽然这可能被内晕中增加的暗物质对数密度所抵消,但它提出了一个问题:对于具有速度抑制湮灭率的暗物质模型,什么角度区域可以优化信噪比?在这里,我们考虑简化的背景模型银河系和河外目标,并证明最佳的观测策略有很大的不同情况。通常,明亮的中心源保证感兴趣的环形区域,而较平坦的背景保证尽可能大的角区域,可能包括中心区域。

英文摘要:

Numerous particle models for the cosmological dark matter feature a pair-annihilation rate that scales with powers of the relative velocity between the annihilating particles. As a result, the annihilation rate in the central regions of a dark matter halo can be significantly lower than at the halo's periphery for particular ambient gravitational potentials. While this might be offset by an increasing dark matter pair number density in the inner halo, it raises the question: what angular region for dark matter models with velocity-suppressed annihilation rates optimizes signal-to-noise? Here, we consider simplified background models for galactic and extragalactic targets and demonstrate that the optimal observing strategy varies greatly case-by-case. Generally, a bright central source warrants an annular region of interest, while a flatter background warrants as large as possible an angular region, possibly including the central regions.

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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