Physics
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010noao.prop..212t&link_type=abstract
NOAO Proposal ID #2010A-0212
Physics
Scientific paper
When we use the baryon density from the CMB, Big Bang Nucleosynthesis using standard physics predicts the deuterium to hydrogen ratio D/H with an error of 3%, and PLANCK will reduce this to 1.6%. Our goal is to improve the measurement of the primordial D/H from the current 10% error to below 3%. We are following two main ways to reduce the error, first improving the accuracy of the existing 7 D/H measurements, and second, the topic of this proposal, finding new places where we can measure D/H. The difference between the measured and predicted D/H is sensitive to new physics. A broad range of physics is relevant because all four forces are involved in the calculation of the predicted D/H. A D/H error of 3% is sufficient to detect an extra species of particle that is relativistic during BBN. We could detect sterile neutrinos, a new type of particle that lacks the usual weak force interaction, and is required by most popular explanations for the neutrino mass.
Day A. A.
Kirkman David
Lee Jeffrey
Lubin Dan
Ou Benjamin
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