Direct detection of light dark matter (DM), below the GeV scale, through electron recoil can be efficient if DM has a velocity well above the virial value of $v\sim 10^{-3}$. We point out that if there is a long range attractive force sourced by bulk ordinary matter, i.e. baryons or electrons, DM can be accelerated towards the Earth and reach velocities $v\sim 0.1$ near the Earth surface. In this "attractive scenario," $\textit{all DM}$ will be boosted to high velocities by the time it reaches direct detection apparatuses in laboratories. We elucidate the implications of this scenario for electron recoil direct detection experiments and find parameters that could lead to potential signals, while being consistent with stellar cooling and other bounds. Our scenario can potentially explain the recent excess in electron recoil signals reported by the XENON1T experiment in the $\sim$ keV energy regime.

中文翻译：

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光暗物质直接探测的有吸引力的场景

如果 DM 的速度远高于 $v\sim 10^{-3}$ 的维里值，则通过电子反冲直接检测低于 GeV 尺度的轻暗物质 (DM) 是有效的。我们指出，如果有来自大块普通物质（即重子或电子）的长程吸引力，DM 可以加速朝向地球并在地球表面附近达到 $v\sim 0.1$ 的速度。在这个“有吸引力的场景”中，当 $\textit{all DM}$ 到达实验室中的直接检测设备时，它将被提升到高速。我们阐明了这种情况对电子反冲直接检测实验的影响，并找到了可能导致潜在信号的参数，同时与恒星冷却和其他界限一致。