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Illuminating Dark Energy with the Joint Efficient Dark-energy Investigation (JEDI)

机译：用联合高效的黑能调查（JEDI）照亮黑能量

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The Universe appears to be expanding at an accelerating rate, driven by a mechanism called Dark Energy. The nature of Dark Energy is largely unknown and needs to be derived from observation of its effects. JEDI (Joint Efficient Dark-energy Investigation) is a candidate implementation of the NASA-DOE Joint Dark Energy Mission (JDEM). It will probe the effects of Dark Energy in three independent -ways: (1) using Type la supernovae as cosmological standard candles over a range of distances, (2) using baryon acoustic oscillations as a cosmological standard ruler over a range of cosmic epochs, and (3) mapping the weak gravitational lensing distortion by foreground galaxies of the images of background galaxies at different distances, JEDI provides crucial systematic error checks by simultaneously applying these three independent observational methods to derive the Dark Energy parameters. The concordance of the results from these methods will not only provide an unprecedented understanding of Dark Energy, but also indicate the reliability of such an understanding. JEDI will unravel the nature of Dark Energy by obtaining observations only possible from a vantage point in space, coupled with a unique instrument design and observational strategy. Using a 2 meter-class space telescope with simultaneous wide-field imaging (～ 1 deg~2, 0.8 to 4.2 μm in five bands) and multi-slit spectroscopy (minimum wavelength coverage 1 to 2 μm), JEDI will efficiently execute the surveys needed to solve the mystery of Dark Energy.
机译：宇宙似乎以加速速率扩展，由称为暗能的机制驱动。黑暗能量的性质主要是未知的，需要源自观察其效果。 Jedi（联合高效的黑能调查）是候选国家航空航天局联合暗能使委派团（JDEM）的候选人。它将在三个独立的道路中探讨暗能量的影响：（1）在一系列距离范围内的宇宙标准蜡烛，（2）在一系列宇宙时期的宇宙中标尺，（2），使用Type La Supernovae作为宇宙标准蜡烛。 （3）通过不同距离的背景星系图像的前景星系映射弱重力透镜失真，通过同时应用这三种独立的观察方法来获得暗能量参数来提供关键的系统误差检查。这些方法的结果的一致性不仅可以提供对黑能的前所未有的理解，而且还表明了这种理解的可靠性。 Jedi将通过从空间中的有利位置获得观察，加上独特的仪器设计和观察策略来解开暗能的性质。使用2米级空间望远镜，同时宽场成像（在五个带中的〜1°〜2,0.8至4.2μm）和多狭光谱（最小波长覆盖率1至2μm），Jedi将有效地执行调查需要解决黑能的神秘。

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