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CMB anisotropies are deviations of the temperature of the black body emission mainly (but not only) by photons, which have to climb out gravitational potential of higher density concentrations during recombination epoch and during their spatio-temporal trajectory till now (Sachs-Wolfe effect). Since these 'cold spots' in the CMB are located on the sky at very specific locations, my question is whether they can be used to infere bout the position of great mass structures now (clusters, dark matter), and, if not, why not.
Thanks.
Thanks.
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