Axion Dark Matter and Planck favor non-minimal couplings to gravity
High Energy Physics - Phenomenology
2015-06-15 v3 Cosmology and Nongalactic Astrophysics
General Relativity and Quantum Cosmology
High Energy Physics - Theory
Abstract
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.
Keywords
Cite
@article{arxiv.1304.7270,
title = {Axion Dark Matter and Planck favor non-minimal couplings to gravity},
author = {Sarah Folkerts and Cristiano Germani and Javier Redondo},
journal= {arXiv preprint arXiv:1304.7270},
year = {2015}
}
Comments
7 pages, 1 figure, revtex, v3: explanations and references added, accepted for publication in Phys.Lett.B