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通风换气次数:ireland closes legal drugs loophole - cnn.com科

科学家认为星系周围存在大量的暗物质分布,但是没有人知道暗物质到底是什么

来源:腾讯网 更新时间:2016-03-12 08:12:22 分类:科技 关键词:疑为暗物质信号

    科学家发现神秘伽玛射线 疑为暗物质信号

    Varadkar also told the Irish Times that the court ruling could affect "dozens" of cases, although The Journal of Ireland said the court's decision will affect only cases now in the judicial process.

    浏览原文:

    早期理论认为暗物质粒子可能是大质量弱相互作用粒子,粒子间彼此湮灭可产生高能伽玛射线。如果这个推测是真实的,那么我们应该探测到非常多的伽玛射线,尤其是星系的中央附近。更麻烦的是,黑洞、脉冲星等也会产生伽玛射线,这就使得真正的暗物质粒子湮灭信号会混杂其中。但这个矮星系却提供了一种途径,因为科学家认为此类星系没有复杂的伽玛环境,是非常干净且安静的天体系统。本项研究的论文已经提交到物理评论快报上。(罗辑/编译)



    科学家发现神秘伽玛射线 疑为暗物质信号

    科学家发现神秘伽玛射线 疑为暗物质信号

    来源:Cnn 更新时间:2016-03-12 08:40:54 分类:News 关键词:...

    Varadkar said the temporarily legalized substances -- which include a wide array of synthetic or "head shop" drugs -- "all have very significant health risks that outweigh any perceived recreational benefits," according to the Irish Times.

    (CNN)Well, it was weird while it lasted.

    虽然这个信号的初步分析结果令人兴奋,但科学家也承认之后还有更多的工作要进行。关于伽玛射线与暗物质的联系,科学家认为我们已经知道暗物质的存在,并了解其所具有的引力特点,同时也推测出星系周围存在暗物质群,但是没有人知道暗物质到底是什么。马修-沃克不仅是卡内基-梅隆大学物理学助理教授,也是麦克威廉姆斯宇宙学中心成员,他认为暗物质的引力探测能够告诉你暗物质粒子的行为,但我们现在却可以通过非引力途径探测暗物质,这说明暗物质的行为有些像粒子。

    The emergency law moved through the Irish legislature and was signed by the President on Wednesday, meaning that the drugs would become illegal to possess again at midnight, a Department of Health spokeswoman told CNN.

    浏览原文:

    The original schedule of substances listed in the 1977 law -- including cannabis, cocaine and heroin -- were untouched by the appeals court ruling and remained illegal.

    Story highlights


      The loophole was inadvertently opened the day before, when an appeals court invalidated one section of the Misuse of Drugs Act 1977.

      腾讯太空讯 据国外媒体报道,来自卡内基-梅隆、布朗和剑桥三所高校的科学家在一个新发现的矮星系中探测到可疑的信号,进一步的分析认为这可能与暗物质有关。新发现的矮星系被命名为Reticulum 2,来自暗能量巡天调查,在过去的数周时间内,科学家确定了这个矮星系基本情况,它距离我们大约9.8万光年。同时,科学家在Reticulum 2矮星系内探测到不明高能伽玛射线。本研究论文的第一作者亚历克斯-格林格认为该星系似乎不存在伽玛射线源,因此这可能是暗物质的信号。

      Ireland closes legal drugs loophole - CNN.com

      Ireland closes legal drugs loophole - CNN.com

      "We prepared for this possibility. Legislation was prepared and approved in advance by Cabinet," Minister for Health Leo Varadkar said in a written statement. "The emergency legislation ... will re-instate the status quo ante and re-control all drugs that were controlled prior to this judgment."

      The court ruled that Irish governments had been unconstitutionally adding substances to Section 2 of the law for decades.


      On Wednesday, lawmakers in Ireland rushed to close a loophole that temporarily made it legal to possess Ecstasy, crystal methamphetamine, ketamine, magic mushrooms and a host of other recreational drugs.

      暗能量巡天主要针对南半球的天空进行,科学家试图通过巡天数据了解宇宙加速膨胀之谜。为了对遥远宇宙天体进行观测,来自卡内基-梅隆大学的研究人员亚历克斯-格林格、马修-沃克和布朗大学的萨瓦斯认为伽玛射线是研究未知天体行为的重要途径,而且其较为容易被探测到,这是因为一旦遥远星系出现伽玛射线活动,我们就可以从巡天背景值中分析出来。布朗教授认为矮星系中释放的伽玛射线是一个非常强力的信号,有望发现与暗物质有关的线索。

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