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黑物质叫Black Matter。文章还提到一个东西很重要,是“Neutralino”,好像有题。黑物质还分hot 和cold。我找来的Neutralino和black Matter的关系,也就这个还跟原文沾点儿边:
As a heavy, stable particle, the lightest neutralino is an excellent candidate to comprise the universe's cold dark matter. In many models the lightest neutralino can be produced thermally in the hot early universe and leave approximately the right relic abundance to account for the observed dark matter. A lightest neutralino of roughly 10–10000 GeV is the leading weakly interacting massive particle (WIMP) dark matter candidate.
Neutralino dark matter could be observed experimentally in nature either indirectly or directly. In the former case, gamma ray and neutrino telescopes look for evidence of neutralino annihilation in regions of high dark matter density such as the galactic or solar center. In the latter case, special purpose experiments such as the Cryogenic Dark Matter Search (CDMS) seek to detect the rare impacts of WIMPs in terrestrial detectors. These experiments have begun to probe interesting supersymmetric parameter space, excluding some models for neutralino dark matter, and upgraded experiments with greater sensitivity are under development.
第一段讲:宇宙中大家知道的物质只占了5%,剩下的都是暗物质.剩下的不记得了.第一段没什么出题点
第二段:提问,暗物质是由什么组成的?P和N不是,接下来是"Nor can more than a few of Neutrino怎么怎么的,意思是Neutrino也不是暗物质. 接下来高亮"一个关于newtrino的实验,说它很轻啦,速度很快啦,因此很hot "总之也不是dark matter.
第三段: 记得个fit的词(我理解是根据以上neutrino特征的反面推出的dark matter的特征), 能fit dark matter的物质具有的特点是cold, sluggish等等. 貌似在现在的cosmatic中不存在,但是在standard的假说中有一种neutranilo的物质符合
第四段: 主要讲neutronilo的,这里提到它不被electromagnetic怎么着(在比较俩个N不同的选项里出现),同时它又是最轻的,它又很stable, 因为如果不够轻的话就会不stable从而被分成俩个更轻的(很绕的逻辑),
第二段和第四段非常长,而且有很多细节题.
第一题:高亮的实验的作用
记得的选项是:1,回答段首的问题.2,支持前面那句话"nor more than".3,为了第三段什么的.我选了第二个.
第二题:Neutrino 和 neutranilo的描述哪个正确(以下简称n1,n2)
1,n2在宇宙初期不被electromagnetic影响(我犹豫了下,文中是提到有,但是没有前面的宇宙初期的限定,我没选)
2,n2比n1重.(我选的这个)
3,n1不stable(文中没提)
4,n2在cosmic中实际上还没被发现?(我排除了) |
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