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宇宙中暗物质与暗能量之间的关系

(2009-08-13 09:13:12)
标签:

胡德良

暗物质

暗能量

关系

衰变

阿卜杜拉

克鲁姆

it

分类: 宇宙探秘

宇宙中暗物质与暗能量之间的关系

尽管暗物质和暗能量占宇宙总质量的90%还要多,但两者之间的关系仍然不为人所知。

Link between universe's dark sides exposed

By Heather Catchpole   胡德良

 

 Astronomers believe they may have found a link between two mysterious phenomena that make up the universe - dark matter and dark energy.

 天文学家们认为,他们可能发现了暗物质和暗能量之间的联系。暗物质与暗能量成为宇宙中的两种神秘现象。

 The research, led by Professor Elcio Abdalla from the Institute of Physics at the Universidade de Sao Paulo, Brazil, appears in a recent issue of the astronomical journal Physics Letters B.

 该研究由巴西圣保罗大学物理研究所的埃尔西奥·阿卜杜拉教授主持,论文发表在最近一期天文学杂志——《物理快报B版》上。

 Dark matter accounts for the motion of groups of galaxies called clusters, which is not easily explained by visible matter alone.

 

Although its composition is not known, astronomers estimate that dark matter makes up approximately 23% of the universe.

 成组的星系被称为星系团,星系团仅仅用可见物质不易解释。而暗物质可以解释星系团的运动。尽管暗物质的构成成分还不为人所知,但是天文学家们估计暗物质约占宇宙的23%

 Dark energy, which accounts for almost three quarters of the universe's mass, is a force that works against gravity and helps explain why the expansion of the universe is accelerating.

 暗能量几乎占宇宙质量的四分之三,这种力量的作用跟引力是相反的,这有助于解释宇宙的膨胀为何正在加速。

 The existence of dark energy and dark matter has been confirmed by numerous astronomical observations. But, despite much conjecture, the link between the two is unknown.

 经过无数次的天文观测已经证实了暗物质和暗能量的存在。然而,尽管拥有许多猜测,但暗物质和暗能量之间的关系却仍然不为人所知。

 Decaying away

 暗能量的衰变

 Abdalla and colleagues from Brazil and China believe they have found a connection between the two - dark energy is decaying into dark matter.

 阿卜杜拉以及来自巴西和中国的同事认为,他们发现了两者之间的联系:暗能量正在衰变成暗物质。

 To reach this conclusion, the researchers calculated the mass of 33 galaxy clusters, studying x-rays, optical light and gravitational lensing effects. They then used these mass estimates in a standard mathematical model of galaxy clusters.

 为了得出上述结论,研究人员计算了33个星系团的质量,同时研究了X射线、可见光和引力透镜效应,然后将质量的估算结果应用到对星系团的标准数值模拟中。

 The models were run assuming no link between dark energy and dark matter, and were then repeated using the assumption that dark energy decays into dark matter. Their results showed that when dark energy and dark matter were linked, the model more closely predicted the clusters' behaviour.

 首先在假定暗物质和暗能量之间没有任何关系的情况下进行模拟,然后在假定暗能量衰变成暗物质的情况下重新进行模拟。结果显示:在暗物质和暗能量相关的情况下,模拟结果能够更为准确地预测星系团的性质。

 The researchers say more galaxy clusters need to be measured and tested to confirm their result.

 研究人员称,要想证实他们的研究成果,还需要对更多的星系团进行测算和试验。

 "If a significant indication of such coupling [between dark matter and dark energy] is still found, this would open a tantalising new window on the nature of the dark sector," the researchers write.

 “如果仍然有重要的迹象表明在暗物质和暗能量之间存在这种关系,那么将会为研究宇宙隐暗部分的性质及时地打开一个新窗口,”研究人员在论文中写道。

 Australian astrophysicist Associate Professor Scott Croom of the University of Sydney says the research is a "nice way to get a different angle on the question of dark matter". But Croom questions whether astronomers could ever get measurements of the mass of clusters accurate enough to confirm the link. "It's hard to put your finger on what exactly [the result] means, because we're still groping around in the dark in terms of trying to understand [dark matter and dark energy]," he says.

 澳大利亚天体物理学家、悉尼大学副教授司各特·克鲁姆指出:“该研究提供了一个好方法,从不同的角度研究了暗物质的问题。”但是,天文学家们所测得的星系团质量是否足够准确,是否足以证实两者之间的关系,克鲁姆怀疑对此持有怀疑态度。“很难确切地说明该研究成果究竟意味着什么,因为在企图了解暗物质和暗能量方面,我们仍然处于在暗中到处摸索的阶段,”他说。

 

译自:《澳大利亚广播公司网站》科学频道(2 April 2009

原著:Heather Catchpole

欢迎光临我博:http://blog.sina.com.cn/hudeliang158

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