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Hydrogen wisps reveal dark energy

机译:氢弹揭示暗能量

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Writing in Astronomy & Astrophysics and the Journal of Cosmology and Astroparticle Physics, the Baryon Oscillation Spectroscopic Survey (BOSS) collaboration reports on how it has used observations of cosmic hydrogen gas to determine the expansion rate of the Universe back before the epoch of acceleration began. That the expansion of the Universe began to accelerate about 7 billion years ago is now an accepted part of the standard cosmologi-cal model. Yet what is causing the acceleration remains a mystery. The term 'dark energy' encompasses several theoretical possibilities, but to distinguish between them more information is needed, such as whether dark energy is constant or changes over time. So far, astronomers have been limited by the fact that most observations have targeted the relatively nearby Universe (at redshift (z) of less than about 1, where supernovae and galaxies are easy to see) or far away (at z about 1,100, where the remnant radiation from the Big Bang is seen). The BOSS team bridges this redshift gap, and measures cosmic expansion at z about 2.3, corresponding to a time when the Universe was less than a quarter of its present estimated age of 13.8 billion years.
机译:重子振荡光谱调查(BOSS)合作在《天文学与天体物理学》和《宇宙科学与天体物理学杂志》上发表文章,报道了它如何利用宇宙氢气的观测来确定宇宙加速开始之前宇宙的膨胀率。大约70亿年前,宇宙的膨胀开始加速,现在已成为标准宇宙模型的一部分。然而,导致加速的原因仍然是个谜。 “暗能量”一词涵盖了几种理论可能性,但要在它们之间进行区分,还需要更多信息,例如暗能量是恒定的还是随时间变化的。到目前为止,天文学家受到以下事实的限制:大多数观测都针对相对较近的宇宙(红移(z)小于约1,其中容易看到超新星和星系)或较远的宇宙(z约为1100,其中看到了来自大爆炸的残余辐射)。 BOSS团队弥合了这个红移差距,并在z约为2.3时测量宇宙膨胀,这对应于宇宙还不到其目前估计年龄138亿年的四分之一的时间。

著录项

  • 来源
    《Nature》 |2013年第7453期|179-180|共2页
  • 作者

    Tamara M. Davis;

  • 作者单位

    the School of Mathematics and Physics, University of Queensland, Brisbane 4072, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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