QSO Light on New Physics

Details QSO Light on New Physics QSO Light on New Physics

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.

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