用超新星数据测量暗能量空间不均匀性
Measuring dark energy spatial inhomogeneity with supernova data
摘要:
宇宙中物质的大尺度分布引起的远源的引力透镜畸变已经得到了广泛的研究。相比之下,人们对暗能量大规模分布的影响知之甚少。我们讨论了使用Ia型超新星作为探测器的空间不均匀性和各向异性的暗能量。我们发现,一个浅的,几乎全天空的调查可以限制均方根暗能量波动在地平线尺度下降到一个分数能量密度~10^-4
英文摘要:
The gravitational lensing distortion of distant sources by the large-scale distribution of matter in the Universe has been extensively studied. In contrast, very little is known about the effects due to the large-scale distribution of dark energy. We discuss the use of Type Ia supernovae as probes of the spatial inhomogeneity and anisotropy of dark energy. We show that a shallow, almost all-sky survey can limit rms dark energy fluctuations at the horizon scale down to a fractional energy density of ~10^-4
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