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[3:00pm]Joint Particle Seminar: Linda Carpenter (UCI)
- Description:
- Speaker: Linda Carpenter (UCI)
Title: Axion Models and Axion Quality
Abstract: Invoking the Peccei-Quinn (PQ) solution to the strong CP problem substitutes the puzzle of why θqcd is so small with the puzzle of why the PQ symmetry is of such high quality. Cosmological and astrophysical considerations raise further puzzles. This paper explores this issues in several contexts: string theory and field theory, and theories without and with low energy super symmetry. Among the questions studied are whether requiring axion dark matter can account for the quality of the PQ symmetry, to which the answer is sometimes yes. In non-supersymmetric theories, we find fa = 1012 GeV is quite plausible. In gauge mediation, cosmological constraints on pseudo moduli place fa in this range, and require that the gravitino mass be of order an MeV.
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