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Primordial non-Gaussianity estimator: The inhomogeneous noise effect
Yu, B.1; Lu, T.2,3
2008-09-01
发表期刊PHYSICAL REVIEW D
卷号78期号:6
摘要Since the inhomogeneous instrument noise can produce extra non-Gaussianity in the cosmic microwave background (CMB) anisotropy, its effect should be carefully subtracted in the primordial non-Gaussianity estimation. We calculate the probability distribution function of the CMB anisotropy for a local type of non-Gaussianity, from which the optimal estimator in the general case ( inhomogeneous noise and cut sky) is obtained. The new estimator obtained here is different from the popular one, since the inhomogeneous noise and cut sky effects are completely accounted for. The CMB anisotropy in the new estimator is noise weighted. The noise weight is different from that used by the WMAP Collaboration in their 5-year data analysis. Although it is still difficult to calculate the new estimator rigorously, for the case of the slightly inhomogeneous noise, there exists a series expansion method to compute the new estimator. Each order in the series is suppressed by two factors, (sigma(2)/sigma(2)(i) - 1) and C(l)/C(l)(tot), which make the method feasible. Through the Edgeworth expansion we can generalize our discussion to other types of non-Gaussianity.
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
DOI10.1103/PhysRevD.78.063008
关键词[WOS]PROBE WMAP OBSERVATIONS ; MICROWAVE ; MAPS
收录类别SCI
语种英语
WOS研究方向Astronomy & Astrophysics ; Physics
WOS类目Astronomy & Astrophysics ; Physics, Particles & Fields
WOS记录号WOS:000259692800018
引用统计
文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/15891
专题院士文集_陆埮
作者单位1.Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
3.Nanjing Univ, Purple Mt Observ, Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Peoples R China
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Yu, B.,Lu, T.. Primordial non-Gaussianity estimator: The inhomogeneous noise effect[J]. PHYSICAL REVIEW D,2008,78(6).
APA Yu, B.,&Lu, T..(2008).Primordial non-Gaussianity estimator: The inhomogeneous noise effect.PHYSICAL REVIEW D,78(6).
MLA Yu, B.,et al."Primordial non-Gaussianity estimator: The inhomogeneous noise effect".PHYSICAL REVIEW D 78.6(2008).
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