Seminars IFIC

# Interacting neutrinos in cosmology

## por Isabel Oldengott (University of Valencia & IFIC)

4-4-4426 - Seminari Física Teòrica (Campus Burjassot)

### 4-4-4426 - Seminari Física Teòrica

#### Campus Burjassot

20
Descripción
The cosmic microwave background (CMB) anisotropies have been
providing useful insights into neutrino physics in the past decade. This
naturally arises the questions whether we can also test non-standard
neutrino interactions using cosmological observations. After an
introduction to cosmological perturbation theory, I present the
Boltzmann hierarchy for neutrinos including self-interactions mediated
by a massive scalar. Such interactions appear, for example, in
majoron-like models of neutrino mass generation. I furthermore show the
induced signal in the CMB angular power spectrum and compare our results
to the approaches by others. Finally, I present constraints on the
neutrino coupling, derived from a MCMC analysis of the Planck 2015 data.
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