利用白矮星对轻暗物质粒子的约束
Constraints on light dark matter particles using white dwarf stars
摘要：
我们利用观测到的球状星团梅西耶4中的白矮星的内部光度，报道了核子-暗物质粒子截面的限制。我们的研究结果涵盖了相对轻的暗物质粒子的参数空间，在质量范围$0.1~GeV-5~GeV$，这是已知的是非常难以探测直接暗物质搜索。恒星内部捕获的暗物质粒子的自湮灭所产生的额外光度不能超过观测到的光度。在此条件下，我们得到了轻暗物质粒子在重子$σ_{Nχ}$上的自旋无关截面的上界：$σ_{Nχ} < 4 \times 10^{-41}{\rm cm^2}$。
英文摘要：
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 mass range $0.1~GeV-5~GeV$, 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 on baryons $σ_{Nχ}$ the upper bound: $σ_{Nχ} < 4 \times 10^{-41}{\rm cm^2}$.
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