The cosmic microwave background radiation is a unique source of information about the early Universe. The detection of its polarization could lead to confirmation of an inflationary phase soon after the Big Bang.
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Zaldarriaga, M. Background comes to the fore. Nature 420, 747–748 (2002). https://doi.org/10.1038/420747a
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DOI: https://doi.org/10.1038/420747a
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