A two-cosine axion dark energy potential fits CMB+BAO+supernova data better than the standard one-cosine potential, while preferring a sub-Planckian decay constant and a feeble dark-matter coupling.
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Cosmology of axion dark energy in supersymmetric models and constraints on high scale parameters
A two-cosine axion dark energy potential fits CMB+BAO+supernova data better than the standard one-cosine potential, while preferring a sub-Planckian decay constant and a feeble dark-matter coupling.