# EPS-HEP2021 conference

26-30 July 2021
Zoom
Europe/Berlin timezone

## Reconstruction of the neutrino mass as a function of redshift

28 Jul 2021, 11:10
20m
Zoom

#### Zoom

Parallel session talk Cosmology

### Speaker

Lena Funcke (Perimeter Institute)

### Description

In this talk, we present a reconstruction of the neutrino mass as a function of redshift, $z$, from current cosmological data using both standard binned priors and linear spline priors with variable knots. Using Planck 2018 cosmic microwave background temperature, polarization and lensing data, in combination with distance measurements from baryonic acoustic oscillations and supernovae, we find that the neutrino mass is consistent with $\sum m_\nu(z)=$ const. We obtain a larger bound on the neutrino mass at low redshifts coinciding with the onset of dark energy domination, $\sum m_\nu(z=0)<1.46$ eV (95% CL). We comment on how this result can be explained either by the well-known degeneracy between $\sum m_\nu$ and $\Omega_\Lambda$ at low redshifts, or by models in which neutrino masses are generated very late in the Universe. We finally convert our results into cosmological limits for models with post-recombination neutrino decay and comment on neutrino mass detection prospects with the KATRIN experiment.

Email lfuncke@perimeterinstitute.ca Lorenz, Löffler, Calabrese Lena Funcke

### Primary authors

Dr Christiane S. Lorenz (ETH Zurich) Lena Funcke (Perimeter Institute) Dr Matthias Löffler (ETH Zurich) Prof. Erminia Calabrese (Cardiff University)