Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
Phys Rev Lett. 2011 Jul 8;107(2):021302. doi: 10.1103/PhysRevLett.107.021302. Epub 2011 Jul 5.
For the first time, measurements of the cosmic microwave background radiation (CMB) alone favor cosmologies with w = -1 dark energy over models without dark energy at a 3.2-sigma level. We demonstrate this by combining the CMB lensing deflection power spectrum from the Atacama Cosmology Telescope with temperature and polarization power spectra from the Wilkinson Microwave Anisotropy Probe. The lensing data break the geometric degeneracy of different cosmological models with similar CMB temperature power spectra. Our CMB-only measurement of the dark energy density Ω(Λ) confirms other measurements from supernovae, galaxy clusters, and baryon acoustic oscillations, and demonstrates the power of CMB lensing as a new cosmological tool.
首次仅凭宇宙微波背景辐射（CMB）的测量结果，在 3.2σ 置信水平上，我们就可以发现具有负常数 w 的暗能量宇宙学优于没有暗能量的宇宙学模型。我们通过将阿塔卡玛宇宙学望远镜（Atacama Cosmology Telescope）的 CMB 引力透镜偏折功率谱与威尔金森微波各向异性探测器（Wilkinson Microwave Anisotropy Probe）的温度和极化功率谱相结合来证明这一点。引力透镜数据打破了具有相似 CMB 温度功率谱的不同宇宙学模型的几何简并性。我们仅使用 CMB 数据对暗能量密度Ω（Λ）的测量结果与来自超新星、星系团和重子声学振荡的其他测量结果相吻合，并展示了 CMB 引力透镜作为一种新的宇宙学工具的强大功能。
