暗矮星：暗物质驱动的亚恒星天体，等待在银河系中心被发现
Dark Dwarfs: Dark Matter-Powered Sub-Stellar Objects Awaiting Discovery at the Galactic Center
AI总结：
研究暗物质湮灭对亚恒星质量天体影响，发现暗物质可驱动形成暗矮星，并预测银河系中心存在此类天体，可通过锂-7丰度探测。
摘要：
我们研究了暗物质湮灭对质量接近亚恒星极限的天体的影响，发现稳定氢燃烧的最小质量大于标准模型预测的约0.075太阳质量。低于此极限时，冷却中的棕矮星会演化为稳定的暗物质驱动天体，我们将其命名为暗矮星。这一转变的时间尺度取决于环境暗物质密度ρ_DM和圆周速度v_DM，但与暗物质质量无关。我们预测在银河系中心附近存在一群暗矮星，那里的暗物质密度预计为ρ_DM≥10^3 GeV/cm^3。在更大的银河系半径处，暗物质密度过低，这些天体在宇宙年龄内尚未形成。暗矮星在其质量范围内保留初始的锂-7，而棕矮星/红矮星会摧毁锂-7，这为探测它们提供了一种方法。
英文摘要：
We investigate the effects of dark matter annihilation on objects with masses close to the sub-stellar limit, finding that the minimum mass for stable hydrogen burning is larger than the $\sim0.075 M_\odot $ value predicted in the Standard Model. Below this limit, cooling brown dwarfs evolve into stable dark matter-powered objects that we name dark dwarfs. The timescale of this transition depends on the ambient dark matter density $ρ_{\rm DM}$ and circular velocity $v_{\rm DM}$ but is independent of the dark matter mass. We predict a population of dark dwarfs close to the galactic center, where the dark matter density is expected to be $ρ_{\rm DM}\gtrsim 10^{3}$ GeV/cm$^3$. At larger galactic radii the dark matter density is too low for these objects to have yet formed within the age of the universe. Dark dwarfs retain their initial lithium-7 in mass ranges where brown/red dwarfs would destroy it, providing a method for detecting them.
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