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Abstract: The expansion of the universe may be observed in ``realtime- by measuringchanges in the patterns of the anisotropy in the CMB. As the universe ages, thesurface of decoupling-or the CMB photosphere-moves away from us and samples adifferent gravitational landscape. The response of the CMB to this newlandscape results in a different pattern than we observe today. The largestchange occurs at l~900. We show that with an array of detectors that we mayenvision having in a couple of decades, one can in principle measure the changein the anisotropy with two high precision measurements separated by a century.



Author: S. Lange, L. Page

Source: https://arxiv.org/







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