标题： 银河卫星与弱等效原理 显示英文标题

标题： Galaxy Satellites and the Weak Equivalence Principle

摘要： 数值模拟显示，一种仅作用于非重子暗物质的长程标量相互作用（LRSI），其强度与引力相当，会产生卫星的扰动模式，这些模式可以与银河系中观察到的现象相符合。 这包括对称的人马座恒星流。 这里提出的一个例外情况，是对Kesden和Kamionkowski演示的一种反驳，即LRSI倾向于产生明显不对称的流，如果LRSI足够强，可以在恒星成分被潮汐破坏之前将恒星与暗物质分离，并且如果恒星在卫星的发光部分占主导质量，则会出现这种情况。 这要求目前的Sgr星系含有很少的暗物质，这可能与Sgr恒星速度弥散度一致，因为在模拟中，近日点处的弥散度超过了维里值。 我们还提供了其他模拟示例，在这些模拟中，强烈的LRSI会产生具有大质量与光度比的卫星，如德雷克（Draco），或者自由的恒星流，这可能与“孤儿”流进行比较。 显示英文摘要

摘要： Numerical simulations of the effect of a long-range scalar interaction (LRSI) acting only on nonbaryonic dark matter, with strength comparable to gravity, show patterns of disruption of satellites that can agree with what is seen in the Milky Way. This includes the symmetric Sagittarius stellar stream. The exception presented here to the Kesden and Kamionkowski demonstration that an LRSI tends to produce distinctly asymmetric streams follows if the LRSI is strong enough to separate the stars from the dark matter before tidal disruption of the stellar component, and if stars dominate the mass in the luminous part of the satellite. It requires that the Sgr galaxy now contains little dark matter, which may be consistent with the Sgr stellar velocity dispersion, for in the simulation the dispersion at pericenter exceeds virial. We present other examples of simulations in which a strong LRSI produces satellites with large mass-to-light ratio, as in Draco, or free streams of stars, which might be compared to "orphan" streams.