Journal
PHYSICS LETTERS B
Volume 728, Issue -, Pages 532-536Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2013.12.026
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Funding
- Humboldt foundation
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Constraints on inflationary scenarios and isocurvature perturbations have excluded the simplest and most generic models of dark matter based on QCD axions. Considering non-minimal kinetic couplings of scalar fields to gravity substantially changes this picture. The axion can account for the observed dark matter density avoiding the overproduction of isocurvature fluctuations. Finally, we show that assuming the same non-minimal kinetic coupling to the axion (dark matter) and to the standard model Higgs boson (inflaton) provides a minimal picture of early time cosmology. (C) 2013 The Authors. Published by Elsevier B.V. All rights
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