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Dark Radiation and interacting scenarios · Around

2012

Dark Radiation and interacting scenarios

Diamanti, Roberta, Giusarma, Elena, Mena, Olga et al.

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An extra dark radiation component can be present in the universe in the form of sterile neutrinos, axions or other very light degrees of freedom which may interact with the dark matter sector.

We derive here the cosmological constraints on the dark radiation abundance, on its effective velocity and on its viscosity parameter from current data in dark radiation-dark matter coupled models.
The cosmological bounds on the number of extra dark radiation species do not change significantly when considering interacting schemes.
We also find that the constraints on the dark radiation effective velocity are degraded by an order of magnitude while the errors on the viscosity parameter are a factor of two larger when considering interacting scenarios.

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