  Fluctuations of the Cosmic Microwave Background CMB are observed by the WMAP.
When expanded into the harmonic eigenmodes of the space part of a cosmological
model, they provide insight into the large-scale topology of space. All
harmonic polynomials on the multiply connected dodecahedral Poincare space are
constructed. Strong and specific selection rules are given by comparing the
polynomials to those on the 3-sphere, its simply connected cover.

General Relativity and Quantum Cosmology