英文名称：Hidden Mirror World
Notes on Hidden Mirror World
摘要：
对暗物质模型作了一些评述。一个例子是镜像物质，它是最古老但仍然可行的DM候选者，也许不是最纯粹的形式。它可以作为其他类似DM模型的测试平台，因为宏观物体的属性对于镜像物质来说是相当固定的。给出了维里定理的教学推导，并指出维里速度或维里温度的概念在某些情况下是有误导性的。它表明，来自星系团碰撞观测的自相互作用截面的限制是不是真正的限制个别粒子，如果他们形成宏观机构。镜物质致密星对星际介质的加热效应非常微弱，但可能是可观测的。M重子吸积对中子星加热的影响可以忽略不计。作为镜像物质星的MACHO的问题被触及。
英文摘要：
A few remarks on Dark Matter (DM) models are presented. An example is Mirror Matter which is the oldest but still viable DM candidate, perhaps not in the purest form. It can serve as a test-bench for other analogous DM models, since the properties of macroscopic objects are quite firmly fixed for Mirror Matter. A pedagogical derivation of virial theorem is given and it is pointed out that concepts of virial velocity or virial temperature are misleading for some cases. It is shown that the limits on self-interaction cross-sections derived from observations of colliding clusters of galaxies are not real limits for individual particles if they form macroscopic bodies. The effect of the heating of interstellar medium by Mirror Matter compact stars is very weak but may be observable. The effect of neutron star heating by accretion of M-baryons may be negligible. Problems of MACHOs as Mirror Matter stars are touched upon.
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