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
中科院分区:
文献类型:
--
作者:
Munshi D
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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DOI:
10.1088/0004-637x/701/1/369
发表时间:
2009
期刊:
The Astrophysical Journal
影响因子:
--
作者:
O. Rudjord;F. Hansen;Xiaohong Lan;M. Liguori;D. Marinucci;S. Matarrese
通讯作者:
S. Matarrese
DOI:
--
发表时间:
2001
期刊:
影响因子:
--
作者:
A. Cooray
通讯作者:
A. Cooray
DOI:
--
发表时间:
2001
期刊:
影响因子:
--
作者:
E. Komatsu;B. Wandelt;D. Spergel;A. Banday;K. Górski
通讯作者:
K. Górski
影响因子:
5
作者:
N. Kogo;E. Komatsu
通讯作者:
E. Komatsu
DOI:
--
发表时间:
2012
期刊:
European journal of combinatorics (Print)
影响因子:
--
作者:
G. Gaiffi;M. Serventi
通讯作者:
M. Serventi