再论暗物质与彗星簇射的联系
Revisiting the Dark Matter - Comet Shower Connection
摘要：
我们重新审视的问题，所观察到的周期性彗星对地球的影响是一致的太阳振荡的银河系中平面和旋臂交叉，在这里的背景下，耗散暗物质模型。考虑是否需要一个假设的薄暗盘，这些模型的签名，以给出正确的周期性，以及是否允许这样的暗盘在银河系引力势的运动学和其他观测约束下，考虑到这些限制的最新更新基于示踪剂种群的垂直周转振荡。我们的分析包含更新的参数银河系盘，自洽的引力势下的泊松-金斯方程，并包括先验概率从本地恒星运动学和银河系星际气体的分布。此外，我们的分析还包括径向振荡和银河旋臂交叉。我们发现一个黑暗的磁盘的彗星周期性的解释是10倍以上的可能性比一个恒定的平均速率模型。此外，我们发现，旋臂交叉是必要的，以正确地预测日期的希克苏鲁伯陨石坑的日期为66 My前。
英文摘要：
We revisit the question of whether the observed periodicity of comet impacts on Earth is consistent with Solar oscillation about the Galactic midplane and spiral arm crossings, here in the context of dissipative dark matter models. Consider whether a hypothetical thin dark disk, a signature of these models, is necessary to give the right periodicity, and whether such a dark disk is allowed given kinematic and other observational constraints on the Galaxy's gravitational potential, taking into account recent updates of these limits based on the vertical epicyclic oscillations of the tracer populations. Our analysis contains updated parameters for the Galactic disk, a self-consistent gravitational potential under the Poisson-Jeans equations, and includes prior probabilities from local stellar kinematics and the distribution of Milky Way interstellar gas. Moreover, our analysis also includes radial oscillations and Galactic spiral arm crossings. We find a dark disk explanation for the comet periodicity to be 10 times more likely than a constant average rate model. Moreover, we find that spiral arm crossing is necessary to correctly predict the date of the Chicxulub crater dated to 66 My ago.
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