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The observation of space-time variations in fundamental constants would provide strong evidence for the existence of new light degrees of freedom in the theory of Nature.
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L. Chuzhoy and P. R. Shapiro, UV pumping of hyperfine transitions in the light elements, with application to 21-cm hydrogen and 92-cm deuterium lines from the early Universe , Astrophys. J. 651
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Cited alongside, same era.
L. Chuzhoy and P. R. Shapiro, Heating and cooling of the intergalactic medium by resonance photons , Astrophys. J. 655
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S. R. Furlanetto, The 21-cm line as a probe of reionization , in Understanding the Epoch of Cosmic Reionization: Challenges and Progress (A. Mesinger, ed.), vol. 423, pp. 247–280 · 2016
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C. Trott et al., CHIPS: The Cosmological HI Power Spectrum Estimator , Astrophys. J. 818
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ESPRESSO Science Team · 2018
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A. Schneider, Constraining non-cold dark matter models with the global 21-cm signal , Phys. Rev. D98
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2019
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