Phys. Rev. D 79, 103504 (2009) [7 pages]Dark radiation as a signature of dark energyReceived 7 March 2009; published 6 May 2009 We propose a simple dark energy model with the following properties: the model predicts a late-time dark radiation component that is not ruled out by current observational data, but which produces a distinctive time-dependent equation of state w(z) for z<3. The dark energy field can be coupled strongly enough to standard model particles to be detected in colliders, and the model requires only modest additional particle content and little or no fine-tuning other than a new energy scale of order milli-electron volts. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.79.103504
DOI:
10.1103/PhysRevD.79.103504
PACS:
95.36.+x, 98.80.Cq
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