Constraints on the Topology of the Universe from the<i>Wilkinson Microwave Anisotropy Probe</i>First‐Year Sky Maps
Constraints on the Topology of the Universe from the<i>Wilkinson Microwave Anisotropy Probe</i>First‐Year Sky Maps
We compute the covariance expected between the spherical harmonic coefficients $a_{\ell m}$ of the cosmic microwave temperature anisotropy if the universe had a compact topology. For 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 …