Measuring the Expansion of the Universe Through Changes in the CMB Photosphere

Details Measuring the Expansion of the Universe Through Changes in the CMB Photosphere Measuring the Expansion of the Universe Through Changes in the CMB Photosphere

2007-06-26

arxiv.org/abs/0706.3908v1

Astronomy and Astrophysics

Astrophysics

4 pages, 8 figures, submitted to ApJ

Scientific paper

10.1086/523097

The expansion of the universe may be observed in ``realtime'' by measuring changes in the patterns of the anisotropy in the CMB. As the universe ages, the surface of decoupling--or the CMB photosphere--moves away from us and samples a different gravitational landscape. The response of the CMB to this new landscape results in a different pattern than we observe today. The largest change occurs at l~900. We show that with an array of detectors that we may envision having in a couple of decades, one can in principle measure the change in the anisotropy with two high precision measurements separated by a century.

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