Planck 2015 results XVII. Constraints on primordial non-Gaussianity
Planck 2015 results XVII. Constraints on primordial non-Gaussianity
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DOI：
10.1051/0004-6361/201525836
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发表时间：
2016-10-01
影响因子：
6.5
通讯作者：
Zonca, A.
中科院分区：
文献类型：
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作者：
Ade, P. A. R.;Aghanim, N.;Zonca, A.
分析了普朗克全使命宇宙微波背景温度和E模偏振图，得到了原初非高斯性的约束条件。使用三类最佳双谱估计-可分离模板拟合（KSW），分箱和模态，我们获得了原始局部，等边和正交双谱振幅的一致值，引用我们的最终结果，仅从温度f（NL）（局部）= 2.5 +/- 5.7，f（NL）（equil）= 16 +/- 70，和f（NL）（邻位）= 34 +/- 33（68% CL，统计学）。结合温度和偏振数据，我们得到f（NL）（局部）= 0.8 +/- 5.0，f（NL）（平衡）= 4 +/- 43，f（NL）（正交）= 26 +/- 21（68%CL，统计）。结果是基于全面的交叉验证，这些估计高斯和非高斯模拟，是稳定的跨组件分离技术，通过广泛的测试套件，并与基于测量的Minkowski泛函的CMB估计是一致的。时域去毛刺系统对双谱的影响可以忽略不计。尽管有这些测试结果，我们保守地将包括偏振数据的结果标记为初步的，这是由于模拟和数据中的噪声模型的已知不匹配。除了个别形状振幅的估计，我们提出了独立的模型，三维重建的普朗克CMB双谱和早期宇宙的情况下，产生原始NG，包括一般的单场模型的膨胀，轴子膨胀，初始状态修改，模型生产宇称违反张量双谱，和方向依赖的矢量模型的约束。我们提出了一个广泛的调查尺度依赖的功能和共振模型，占“看别处”的影响，估计统计意义的功能。我们还寻找等曲率NG，并没有发现信号，但我们得到的约束，包括偏振显着改善。局部模型中的原始三谱振幅被约束为g（NL）（局部）=（9.0 +/- 7.7）x 10（4）（68%CL统计），并且我们对超出局部情况的三谱形状进行分析。出现的全局图像与Lambda CDM宇宙学的前提一致，即我们今天观察到的结构源于绝热，被动，高斯和原始种子扰动。
The Planck full mission cosmic microwave background (CMB) temperature and E-mode polarization maps are analysed to obtain constraints on primordial non-Gaussianity (NG). Using three classes of optimal bispectrum estimators - separable template-fitting (KSW), binned, and modal we obtain consistent values for the primordial local, equilateral, and orthogonal bispectrum amplitudes, quoting as our final result from temperature alone f(NL)(local) = 2.5 +/- 5.7, f(NL)(equil) = 16 +/- 70, and f(NL)(ortho) = 34 +/- 33 (68% CL, statistical). Combining temperature and polarization data we obtain f(NL)(local) = 0.8 +/- 5.0, f(NL)(equil) = 4 +/- 43, and f(NL)(ortho) = 26 +/- 21 (68% CL, statistical). The results are based on comprehensive cross-validation of these estimators on Gaussian and non-Gaussian simulations, are stable across component separation techniques, pass an extensive suite of tests, and are consistent with estimators based on measuring the Minkowski functionals of the CMB. The effect of time-domain de-glitching systematics on the bispectrum is negligible. In spite of these test outcomes we conservatively label the results including polarization data as preliminary, owing to a known mismatch of the noise model in simulations and the data. Beyond estimates of individual shape amplitudes, we present model-independent, three-dimensional reconstructions of the Planck CMB bispectrum and derive constraints on early universe scenarios that generate primordial NG, including general single-field models of inflation, axion inflation, initial state modifications, models producing parity-violating tensor bispectra, and directionally dependent vector models. We present a wide survey of scale-dependent feature and resonance models, accounting for the "look elsewhere" effect in estimating the statistical significance of features. We also look for isocurvature NG, and find no signal, but we obtain constraints that improve significantly with the inclusion of polarization. The primordial trispectrum amplitude in the local model is constrained to be g(NL)(local) = (9.0 +/- 7.7) x 10(4) (68% CL statistical), and we perform an analysis of trispectrum shapes beyond the local case. The global picture that emerges is one of consistency with the premises of the Lambda CDM cosmology, namely that the structure we observe today was sourced by adiabatic, passive, Gaussian, and primordial seed perturbations.