BCCP, Department of Physics, University of California, Berkeley, California 94720, USA.
Phys Rev Lett. 2011 Jul 8;107(2):021301. doi: 10.1103/PhysRevLett.107.021301. Epub 2011 Jul 5.
We report the first detection of the gravitational lensing of the cosmic microwave background through a measurement of the four-point correlation function in the temperature maps made by the Atacama Cosmology Telescope. We verify our detection by calculating the levels of potential contaminants and performing a number of null tests. The resulting convergence power spectrum at 2° angular scales measures the amplitude of matter density fluctuations on comoving length scales of around 100 Mpc at redshifts around 0.5 to 3. The measured amplitude of the signal agrees with Lambda cold dark matter cosmology predictions. Since the amplitude of the convergence power spectrum scales as the square of the amplitude of the density fluctuations, the 4σ detection of the lensing signal measures the amplitude of density fluctuations to 12%.
我们报告了首次通过对阿塔卡马宇宙学望远镜制作的温度图的四点相关函数的测量，检测到宇宙微波背景的引力透镜效应。我们通过计算潜在污染物的水平并进行多项空值测试来验证我们的检测。在 2°角尺度上得到的会聚功率谱测量了红移约 0.5 到 3 时，共动长度尺度约为 100Mpc 处物质密度涨落的幅度。测量信号的幅度与 Lambda 冷暗物质宇宙学预测一致。由于会聚功率谱的幅度与密度涨落的幅度的平方成正比，因此对透镜信号的 4σ 检测测量了密度涨落的幅度达到 12%。
