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Scale-invariance as the origin of dark radiation? · Around

2013

Scale-invariance as the origin of dark radiation?

Gorbunov, Dmitry, Tokareva, Anna

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Recent cosmological data favour R^2-inflation and some amount of non-standard dark radiation in the Universe.

We show that a framework of high energy scale invariance can explain these data.
The spontaneous breaking of this symmetry provides gravity with the Planck mass and particle physics with the electroweak scale.
We found that the 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.

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