TH Cosmo Coffee

# Extended cosmological models versus Planck

## by Andrea Marchini, Eleonora Di Valentino (Rome U.)

Wednesday, 2 October 2013 from to (Europe/Zurich)
at CERN ( 4-2-011 - TH common room )
 Description The recent measurements of high resolution of the anisotropies in the Cosmic Microwave Background provided by the Planck satellite have been opening a new window on the early universe. On one hand LCDM model seems to be a good benchmark model, on the other hand some tensions arise in the parameters when comparing Planck values with the results of other independent experiments. Even if the tensions might be due to systematics, it is worth to investigate if they can instead be hints for new physics in the dark sector. This, week two (related) topics will be discussed in 30 minutes each: Andrea Marchini will show constraints on f(R) gravity and on interacting dark matter-dark energy models and will discuss how the tensions can be mitigated in these scenarios. Eleonora Di Valentino will present new constraints on a dark radiation component parametrized by the effective neutrino number N_eff, sound speed c_s and viscosity c_eff. She will then discuss some possible physical candidates for dark radiation, as a sterile neutrino or an asymmetric dark sector model.