Complementarity of Neutrinoless Double Beta Decay and Cosmology

Understand

Neutrinoless double beta decay experiments constrain one combination of neutrino parameters, while cosmic surveys constrain another.

• This complementarity opens up an exciting range of possibilities.
• If neutrinos are Majorana particles, and the neutrino masses follow an inverted hierarchy, then the upcoming sets of both experiments will detect signals.
• The combined constraints will pin down not only the neutrino masses but also constrain one of the Majorana phases.