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arXiv 2103.11646astro-ph.COastro-ph.HEhep-ph
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用矮球状星系观测测量暗物质微观物理的前景

Prospects for measuring dark matter microphysics with observations of dwarf spheroidal galaxies

Eric J. Baxter, Jason Kumar, Andrew B. Pace, Jack Runburg

摘要:

银河系附近矮球状(dSph)星系中的暗物质湮灭有可能产生可探测的伽马射线特征。这个信号的幅度取决于dSph中的暗物质密度、暗物质粒子质量、湮灭中产生的光子数以及可能与速度相关的暗物质湮灭截面。我们认为,如果从多个dSphs的湮灭信号的幅度可以测量,它是可能的,以确定速度依赖性的湮灭截面。然而,我们表明,这样做将需要改进的dSph密度分布的约束,包括控制系统的不确定性的可能来源。对未来的改进做出合理的假设,我们对当前和未来的实验--包括费米、CTA和AMEGO --约束暗物质湮灭速度依赖性的能力进行了预测。

英文摘要:

Dark matter annihilation in dwarf spheroidal (dSph) galaxies near the Milky Way has the potential to produce a detectable signature in gamma-rays. The amplitude of this signal depends on the dark matter density in a dSph, the dark matter particle mass, the number of photons produced in an annihilation, and the possibly velocity-dependent dark matter annihilation cross section. We argue that if the amplitude of the annihilation signal from multiple dSphs can be measured, it is possible to determine the velocity-dependence of the annihilation cross section. However, we show that doing so will require improved constraints on the dSph density profiles, including control of possible sources of systematic uncertainty. Making reasonable assumptions about future improvements, we make forecasts for the ability of current and future experiments -- including Fermi, CTA and AMEGO -- to constrain the dark matter annihilation velocity dependence.

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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