New constraints on isospin-violating dark matter
New constraints on isospin-violating dark matter
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DOI：
10.1103/physrevd.85.081301
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发表时间：
2011-12
影响因子：
5
通讯作者：
J. Kumar;D. Sanford;L. Strigari
中科院分区：
文献类型：
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作者：
J. Kumar;D. Sanford;L. Strigari
利用来自银河系卫星的伽马射线的费米-拉特界，我们得到了主要湮没到上夸克或下夸克的低质量(5char220GeV)暗物质的暗物质湮灭截面的界限。对于暗物质-标准模型相互作用由特定的接触算符调节的模型，我们证明了这些边界可以直接转化为暗物质-质子散射截面的边界。对于违反同位旋的暗物质，这些约束足够严格，足以开始约束与低质量暗物质的实验信号一致的参数空间。我们讨论了可以避开这些界限的可能模型。
We derive bounds on the dark matter annihilation cross-section for low-mass (5\char21{}20 GeV) dark matter annihilating primarily to up or down quarks, using the Fermi-LAT bound on gamma-rays from Milky Way satellites. For models in which dark matter-Standard Model interactions are mediated by particular contact operators, we show that these bounds can be directly translated into bounds on the dark matter-proton scattering cross section. For isospin-violating dark matter, these constraints are tight enough to begin to constrain the parameter-space consistent with experimental signals of low-mass dark matter. We discuss possible models that can evade these bounds.