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News
Probe seeks changes in fine-structure constant Mar 23
Cosmologists in the US have proposed a new way to measure the fine-structure constant as it was some 13 billion years ago -- and see if its value differed from that measured today. The method, which has yet to be verified using astronomical observations, involves measuring how hydrogen atoms absorbed photons from the cosmic microwave background. It could provide further evidence that this fundamental constant of nature -- which defines the strength of the electromagnetic interaction -- is not actually a constant after all (Phys. Rev. Lett. 98 11301).
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