New approaches to probing Minkowski functionals

New approaches to probing Minkowski functionals
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探测闵可夫斯基泛函的新方法

DOI:
10.1093/mnras/stt1189
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发表时间:
2013
影响因子:
4.8
通讯作者:
Munshi D
Munshi D
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Munshi D

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我们推广的概念,普通的斜谱探测宇宙微波背景(CMB)地图的形态在几个领域的非高斯性的影响:在真实的空间(在那里他们通常被称为累积量),并在谐波和针状基地。基本目的是保留比通常包含在这些统计中更多的信息,以帮助确定任何测量的非高斯性的来源,在相同的精神Munshi & Heavens偏斜光谱被用来识别前景污染物的CMB双谱在普朗克数据。使用一个微扰系列构造的闵可夫斯基泛函(MF),我们提供了一个伪为基础的方法,在谐波和针状表示估计这些频谱中存在的掩模和非均匀噪声。假设均匀噪声,我们提出了近似表达式的误差协方差联合估计这些频谱的目的。我们提出了四种不同的模型的原始非高斯局部,等边,正交和折叠模型,以及非高斯引起的未减点源的具体结果。根据四峰谱得到了对MF的次阶修正的封闭形式结果。我们还使用了双谱和三谱的模态分解方法来重建MF,作为一种替代的方法来重建CMB图的形态特性。最后,我们引入奇宇称斜谱来研究奇宇称双谱及其对CMB天空形态的影响。虽然开发的CMB,这里得到的通用结果可以在宇宙学的其他领域是有用的。
We generalize the concept of the ordinary skew-spectrum to probe the effect of non-Gaussianity on the morphology of cosmic microwave background (CMB) maps in several domains: in real space (where they are commonly known ascumulant-correlators), and in harmonic and needlet bases. The essential aim is to retain more information than normally contained in these statistics, in order to assist in determining the source of any measured non-Gaussianity, in the same spirit as Munshi & Heavens skew-spectra were used to identify foreground contaminants to the CMB bispectrum inPlanckdata. Using a perturbative series to construct the Minkowski functionals (MFs), we provide a pseudo-based approach in both harmonic and needlet representations to estimate these spectra in the presence of a mask and inhomogeneous noise. Assuming homogeneous noise, we present approximate expressions for error covariance for the purpose of joint estimation of these spectra. We present specific results for four different models of primordial non-Gaussianitylocal,equilateral,orthogonalandenfoldedmodels, as well as non-Gaussianity caused by unsubtracted point sources. Closed form results of next-order corrections to MFs too are obtained in terms of a quadruplet of kurt-spectra. We also use the method ofmodal decompositionof the bispectrum and trispectrum to reconstruct the MFs as an alternative method of reconstruction of morphological properties of CMB maps. Finally, we introduce the odd-parity skew-spectra to probe the odd-parity bispectrum and its impact on the morphology of the CMB sky. Although developed for the CMB, the generic results obtained here can be useful in other areas of cosmology.
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