We report constraints on the nucleon-dark matter particle cross-section using the internal luminosity of observed white dwarf stars in the globular cluster Messier 4. Our results cover the parameter space corresponding to relatively light dark matter particles, in the sub GeV range, which is known to be very difficult to be probed by direct dark matter searches. The additional luminosity coming from self-annihilations of dark matter particles captured inside the stars must not exceed the observed luminosity. Imposing that condition, we obtain for the spin independent cross-section of light dark matter particles (below 5[Formula: see text]GeV) on baryons [Formula: see text] the upper bound: [Formula: see text].

中文翻译：

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使用白矮星对轻暗物质粒子的约束

我们使用球状星团 Messier 4 中观察到的白矮星的内部光度报告了对核子-暗物质粒子截面的约束。我们的结果涵盖了与相对较轻的暗物质粒子相对应的参数空间，在亚 GeV 范围内，其中已知很难通过直接暗物质搜索来探测。恒星内部捕获的暗物质粒子自我湮灭所产生的额外光度不得超过观测到的光度。施加该条件，我们获得了重子上轻暗物质粒子（低于 5[公式：见文本]GeV）的自旋无关截面 [公式：见文本] 上限：[公式：见文本]。