Dark radiation and decaying matter

  title={Dark radiation and decaying matter},
  author={Maria Concepcion Gonzalez-Garcia and V. Niro and Jordi Salvado},
  journal={Journal of High Energy Physics},
A bstractRecent cosmological measurements favour additional relativistic energy density beyond the one provided by the three active neutrinos and photons of the Standard Model (SM). This is often referred to as “dark radiation”, suggesting the need of new light states in the theory beyond those of the SM. In this paper, we study and numerically explore the alternative possibility that this increase comes from the decay of some new form of heavy matter into the SM neutrinos. We study the… 
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