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This paper, http://arxiv.org/abs/1503.03859, suggests a possible explanation for hemispherical anisotropy in the CMB based on non-commutative space time.
Hemispherical anisotropy in the Cosmic Microwave Background (CMB) refers to the uneven distribution of temperature fluctuations across the sky, where one half of the sky appears warmer or cooler than the other half.
The most widely accepted explanation for hemispherical anisotropy in the CMB is inflation, a period of rapid expansion in the early universe. This inflationary period would have caused tiny quantum fluctuations to be stretched across the universe, resulting in the uneven distribution of temperature fluctuations in the CMB.
Hemispherical anisotropy in the CMB is measured through observations made by satellites and ground-based telescopes. These observations measure the temperature fluctuations in the CMB and create maps of the sky, which can reveal the uneven distribution of temperature across the sky.
The presence of hemispherical anisotropy in the CMB supports the theory of inflation and provides insight into the early universe. It also suggests that the universe is not perfectly isotropic, or the same in all directions, which challenges some models of the universe.
While the inflationary model is the most widely accepted explanation for hemispherical anisotropy in the CMB, there are other proposed explanations, such as cosmic defects or the influence of large-scale structures in the universe. However, these alternative explanations are not as well-supported by observational evidence as the inflationary model.