Constraints on the topology of the universe from the Wilkinson microwave anisotropy probe first-year sky maps

被引:17
作者
Phillips, N. G. [1 ]
Kogut, A. [1 ]
机构
[1] NASA, Goddard Space Flight Ctr, SSAI, Greenbelt, MD 20771 USA
关键词
cosmic microwave background; cosmology : observations;
D O I
10.1086/432861
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We compute the covariance expected between the spherical harmonic coefficients a(lm) of the cosmic microwave temperature anisotropy if the universe had a compact topology. For a fundamental cell size smaller than the distance to the decoupling surface, off-diagonal components carry more information than the diagonal components (the power spectrum). We use a maximum likelihood analysis to compare the Wilkinson Microwave Anisotropy Probe (WMAP) first-year data to models with a cubic topology. The data are compatible with finite flat topologies with fundamental domain L > 1.2 times the distance to the decoupling surface at a 95% confidence level. The WMAP data show reduced power at the quadrupole and octopole, but they do not show the correlations expected for a compact topology and are indistinguishable from infinite models.
引用
收藏
页码:820 / 825
页数:6
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