期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 3, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP03(2018)049
关键词
Cosmology of Theories beyond the SM; CP violation
资金
- National Science Foundation (NSF) [PHY-0855591, PHY-1216270]
- U.S. Department of Energy (DOE) [DE-SC0012012]
- NSF Grant [1316699]
- DOE [DE-SC-00012567, DE-SC-00015476]
- U.S. Department of Energy (DOE) [DE-SC0012012] Funding Source: U.S. Department of Energy (DOE)
We present a new mechanism to deplete the energy density of the QCD axion, making decay constants as high as f(a) similar or equal to 10(17) GeV viable for generic initial conditions. In our setup, the axion couples to a massless dark photon with a coupling that is moderately stronger than the axion coupling to gluons. Dark photons are produced copiously through a tachyonic instability when the axion field starts oscillating, and an exponential suppression of the axion density can be achieved. For a large part of the parameter space this dark radiation component of the universe can be observable in upcoming CMB experiments. Such dynamical depletion of the axion density ameliorates the isocurvature bound on the scale of inflation. The depletion also amplifies the power spectrum at scales that enter the horizon before particle production begins, potentially leading to axion miniclusters.
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