Cross correlation of the cosmic microwave background with radio sources: Constraints on an accelerating universe

被引:53
作者
Boughn, SP [1 ]
Crittenden, RG
机构
[1] Haverford Coll, Dept Astron, Haverford, PA 19041 USA
[2] Univ Cambridge, Dept Appl Math & Theoret Phys, Cambridge CB3 9EW, England
关键词
D O I
10.1103/PhysRevLett.88.021302
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We present a new limit on the cosmological constant based on the absence of correlations between the cosmic microwave background (CMB) and the distribution of distant radio sources. In cosmological constant, cold dark matter (ACDM) models, such correlations should have been produced via the integrated Sachs-Wolfe effect, assuming that radio sources trace the local (z similar to 1) matter density. We find no evidence of correlations and obtain a 95% C.L. upper limit on the cosmological constant of Omega(Lambda) less than or equal to 0.74. If 0.6 < Ω(Λ) < 0.7 as suggested by recent CMB anisotropy and supernovae observations, then the integrated Sachs-Wolfe effect should be detectable with upcoming CMB maps and radio surveys.
引用
收藏
页码:4 / 213024
页数:4
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