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Grand deuterium challenge unveiled Sep 7

Data from the Cosmic Microwave Background (CMB) could provide the first direct glimpse of how much deuterium formed in the minutes after the Big Bang, according to researchers at Caltech in the US. They have proposed a "technically challenging" way to directly measure the amount of deuterium in the primordial universe that would involve studying tiny fluctuations in the absorption of hydrogen and deuterium at high redshifts. They have not, however, carried out the measurement, which would require a "heroic" experimental effort (Phys. Rev. Lett. 97 091301).


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