Dmitry Gorbunov, Anna Tokareva
Recent cosmological and astrophysical data favour R^2-inflation and some amount of non-standard dark radiation in the Universe. It can be an indication of scale-invariance at high energies. Its spontaneous breaking provides gravity with the Planck mass and particle physics with the electroweak scale. We found that corresponding massless Nambu--Goldstone bosons, dilatons, are produced at reheating by the inflaton decay right at the amount needed to explain primordial abundances of light chemical elements and anisotropy of the cosmic microwave background. Then we extended the discussion on the interplay with Higgs-inflation and general class of inflationary models where dilatons are allowed and may form the dark radiation.
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http://arxiv.org/abs/1307.5298
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