标题： 用银河系动力学检验两种暗物质替代理论 显示英文标题

标题： Testing two alternatives theories to dark matter with the Milky Way dynamics

摘要： 通过检验两种暗物质替代理论描述银河系动力学的一致性，对其进行了研究。 第一种理论是一种修正引力理论，具有可变的引力常数，第二种假设暗物质晕由玻色-爱因斯坦凝聚态构成。 每个模型的参数以及表征星系恒星子系统的参数通过拟合银河系旋转曲线来估计。 然后利用这些参数计算太阳位置处的垂直加速度剖面，并与观测结果进行比较。 修正引力理论过高估计了从恒星动力学推导出的垂直加速度，而玻色-爱因斯坦凝聚晕模型的预测结果与观测结果几乎一致。 然而，基于无碰撞流体的暗物质晕满足我们的一致性测试，是能够同样很好地描述旋转曲线和银河系垂直加速度的最佳模型。 显示英文摘要

摘要： Two alternative theories to dark matter are investigated by testing their ability to describe consistently the dynamics of the Milky Way. The first one refers to a modified gravity theory having a running gravitational constant and the second assumes that dark matter halos are constituted by a Bose-Einstein condensation. The parameters of each model as well as those characterizing the stellar subsystems of the Galaxy were estimated by fitting the rotation curve of the Milky Way. Then, using these parameters, the vertical acceleration profile at the solar position was computed and compared with observations. The modified gravity theory overestimates the vertical acceleration derived from stellar kinematics while predictions of the Bose-Einstein condensation halo model are barely consistent with observations. However, a dark matter halo based on a collisionless fluid satisfies our consistency test, being the best model able to describe equally well the rotation curve and the vertical acceleration of the Galaxy.