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Scale dependence of the primordial spectrum from combining the three-year WMAP, galaxy clustering, supernovae, and Lyman-alpha forests
Feng, B; Xia JQ(夏俊卿); Xia, JQ; Yokoyama, J
2007
Source PublicationJOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Issue5Pages:20
Corresponding AuthorUniv Tokyo, RESCEU, Grad Sch Sci, Tokyo 1130033, Japan ; Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
SubtypeArticle
AbstractWe probe the scale dependence of the primordial spectrum in the light of the three-year WMAP (WMAP3) alone and WMAP3 in combination with the other cosmological observations such as galaxy clustering and type Ia supernova (SNIa). We pay particular attention to the combination with the Lyman-alpha (Ly alpha) forest. In contrast to the first-year WMAP (WMAP1), WMAP3's preference for the running of the scalar spectral index on large scales is now fairly independent of the low CMB multipoles l. A combination with the galaxy power spectrum from the Sloan Digital Sky Survey (SDSS) prefers a negative running to larger than 2 sigma, regardless of the presence of the low-l CMB ( 2 <= l <= 23) or not. On the other hand, if we focus on the power law Lambda CDM cosmology with only six parameters (matter density Omega(m)h(2), baryon density Omega(b)h(2), Hubble constant H-0, optical depth tau, the spectral index, ns, and the amplitude, A(s), of the scalar perturbation spectrum) when we drop the low-l CMB contributions WMAP3 is consistent with the Harrison-Zel'dovich-Peebles scale-invariant spectrum (n(s) = 1 and no tensor contributions) at similar to 1 sigma. When assuming a simple power-law primordial spectral index or a constant running, in the case when one drops the low-l contributions ( 2 <= l <= 23) WMAP3 is more consistent with the other observations, such as the inferred value of sigma(8).
KeywordCMBR experiments inflation physics of the early universe
Subject AreaAstronomy & Astrophysics; Physics
DOI10.1088/1475-7516/2007/05/020
URL查看原文
Indexed ByINSPIREHEP ; ADS
Language英语
WOS Research AreaAstronomy & Astrophysics ; Physics
WOS SubjectAstronomy & Astrophysics ; Physics, Particles & Fields
WOS IDWOS:000246851300002
ADS Bibcode2007JCAP...05..020F
ADS URLhttps://ui.adsabs.harvard.edu/abs/2007JCAP...05..020F
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2007JCAP...05..020F/citations
inspireid723972
inspireURLhttps://inspirehep.net/literature/723972
Citation statistics
Cited Times:10 [INSPIRE]
Cited Times:12 [ADS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/240365
Collection理论物理室
粒子天体物理中心
Affiliation中国科学院高能物理研究所
First Author AffilicationInstitute of High Energy
Recommended Citation
GB/T 7714
Feng, B,Xia JQ,Xia, JQ,et al. Scale dependence of the primordial spectrum from combining the three-year WMAP, galaxy clustering, supernovae, and Lyman-alpha forests[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2007(5):20.
APA Feng, B,夏俊卿,Xia, JQ,&Yokoyama, J.(2007).Scale dependence of the primordial spectrum from combining the three-year WMAP, galaxy clustering, supernovae, and Lyman-alpha forests.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(5),20.
MLA Feng, B,et al."Scale dependence of the primordial spectrum from combining the three-year WMAP, galaxy clustering, supernovae, and Lyman-alpha forests".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .5(2007):20.
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